Sheet Metal Fabrication

Quick AnswerConsistent weld quality is achieved through six practices: (1) proper joint design and preparation (cleaning, beveling), (2) qualified welders with current certifications (AWS D1.1, ASME Section IX), (3) controlled welding parameters (amperage, voltage, travel speed), (4) in-process inspection including weld gauges, (5) post-weld inspection (visual, dimensional, NDT), and (6) documented quality procedures and traceability.Joint Design and PreparationProper joint design is the foundation of weld quality. Common sheet metal joints: butt joint (edge-to-edge), lap joint (overlapping sheets), corner joint, and T-joint. Edges must be clean -- free of oil, rust, paint, and moisture. For thicker materials, beveling the edges (30-45 degrees) ensures full penetration. Gap control is critical: consistent gaps (typically 1-2mm) produce consistent welds.Welder QualificationWelder skill is the most important variable. Qualified welders should hold current certifications: AWS D1.1 for structural steel, AWS D1.6 for stainless steel, and ASME Section IX for pressure vessels. Certification should match the process (TIG, MIG), material, and position (flat, horizontal, vertical, overhead) required for your project. Welders should be re-certified every 6 months.Inspection MethodsVisual inspection (VT): Check for cracks, porosity, undercut, overlap, and surface contamination. Dimensional inspection: Verify weld size, leg length, and overall dimensions. Dye penetrant testing (PT): Detects surface cracks and porosity in non-porous materials. Radiographic testing (RT): X-ray detects internal defects for critical applications. Mechanical testing: Destructive tests (tensile, bend) for qualification and first-article verification.Documentation and TraceabilityFor quality assurance, maintain: welding procedure specifications (WPS), procedure qualification records (PQR), welder performance qualifications (WPQ), material test reports (MTR), in-process inspection records, and final inspection reports. This documentation chain provides full traceability from raw material to finished weld.Why Choose SOMI Custom PartsAt SOMI Custom Parts, our welding quality system follows AWS D1.1 and D1.6 standards. All our welders are certified and regularly tested. We maintain WPS and PQR documentation for all common material/process combinations. Every welded part undergoes visual inspection, and we offer dye penetrant testing for critical applications. Our quality records provide full traceability for your documentation requirements.Case StudyA pressure vessel manufacturer needed welded stainless steel tanks with certified welds and full documentation for ASME compliance. SOMI qualified the welding procedure to ASME Section IX, assigned certified welders to the project, performed weld mapping and 100% visual inspection, and provided complete documentation including WPS, welder certifications, and NDT reports. The tanks passed ASME inspection on the first submission.Industry DataAccording to the American Welding Society, 80% of weld defects are caused by poor joint preparation or welder technique rather than material issues. Companies with certified welding programs report 60% fewer weld failures and 40% lower rework costs compared to those without formal qualification (AWS, 2025).Related QuestionsWhat types of welding are used in sheet metal?What are the common metal bending techniques?What processes are involved in sheet metal fabrication?How to choose a sheet metal fabrication provider?

Quick AnswerThe best welding process depends on material and application: TIG (GTAW) for thin stainless and aluminum with cosmetic welds, MIG (GMAW) for thicker steel with high deposition rates, spot welding (RSW) for high-volume production of lap joints, and laser welding for precision applications requiring minimal heat input. For most custom sheet metal fabrication, TIG and MIG account for 85% of all welding.TIG Welding (GTAW)Tungsten Inert Gas (TIG) welding uses a non-consumable tungsten electrode and a separate filler rod. It produces the highest quality, cleanest welds with excellent control over the weld pool. Best for: stainless steel (304, 316) 0.5-3mm, aluminum 1-4mm, and all thicknesses where appearance matters. TIG welds require minimal post-weld cleanup. Typical welding speed: 50-200 mm/min. Requires skilled operators.MIG Welding (GMAW)Metal Inert Gas (MIG) welding uses a consumable wire electrode that feeds automatically through the welding gun. It is faster than TIG and easier to learn. Best for: mild steel 1.5-6mm, thicker sections requiring high deposition, and structural welds where appearance is less critical. MIG welding deposition rates: 2-8 kg/hour depending on wire diameter and settings. Gas shielding: 75% Argon + 25% CO2 for steel.Resistance Spot Welding (RSW)Spot welding is the most efficient method for joining overlapping sheet metal (0.5-3mm each). Two copper electrodes clamp the sheets and pass a high current (8,000-15,000 A) for 0.1-0.5 seconds, creating a fused nugget at the interface. Weld time: 1-3 seconds per spot. Ideal for high-volume production of enclosures, automotive panels, and consumer products. Spot welding is fully automated with robotic systems.Why Choose SOMI Custom PartsAt SOMI Custom Parts, we offer TIG, MIG, and spot welding capabilities with certified welders for each process. Our TIG welders specialize in food-grade and medical-grade welds with sanitary finishes. Our MIG welding department handles structural steel fabrications. For high-volume projects, we can integrate robotic welding for consistent quality and maximum throughput.Case StudyA food processing equipment manufacturer required 500 stainless steel hoppers with sanitary TIG welds (no pits, no cracks, Ra 0.8 finish). SOMI's certified TIG welders completed all welds using 316L filler rod with argon backing gas to prevent oxidation. The welds passed dye penetrant inspection and surface finish verification. The client's FDA auditor approved the fabrication on the first visit.Industry DataTIG welding accounts for 25% of sheet metal fabrication welding, MIG for 60%, and spot welding for 15% (American Welding Society, 2025). Robotic welding has grown 35% over the past 5 years and now accounts for 30% of all production welding, with ROI typically achieved in 12-18 months for high-volume applications.Related QuestionsHow to ensure weld quality in custom metal parts?What are the common metal bending techniques?What thickness and metals can be laser cut?What processes are involved in sheet metal fabrication?

Quick AnswerBend allowance is calculated using the formula: BA = (0.0078 x T + 0.0174 x R) x A, where T = thickness (inches), R = inside radius, and A = bend angle (degrees). For metric: BA = (0.43 x T - 0.007 x W) x A, with W = die opening width. Modern CAD/CAM software automatically calculates bend allowance, but understanding the principle helps engineers design parts that will flatten correctly.The K-Factor MethodThe K-factor represents the neutral axis location as a fraction of material thickness. A K-factor of 0.33 (for most air-bent mild steel) means the neutral axis is at 33% of the thickness from the inside surface. The bend allowance formula using K-factor: BA = (0.017453 x R + 0.0078 x T) x A. This is the most commonly used method in CAD software like SolidWorks and Inventor.K-Factor Values by MaterialMild steel (air bending): K = 0.33. Stainless steel (air bending): K = 0.37. Aluminum 5052 (air bending): K = 0.41. Aluminum 6061 (air bending): K = 0.43. Copper, brass: K = 0.35. These values change with different die openings and bending methods. For bottom bending and coining, use K = 0.25-0.30. For sharp bends (radius less than material thickness), K approaches 0.5.Practical RulesFor quick estimates without calculation: internal radius typically equals material thickness (R = T) for air bending. Bend deduction is approximately 1.6x thickness for 90-degree bends in steel. The minimum flange length should be 3x material thickness plus bend radius. Minimum hole-to-bend distance should be 2x material thickness plus bend radius. Hole distortion begins when holes are closer than 1x thickness from the bend line.Why Choose SOMI Custom PartsAt SOMI Custom Parts, our CAM software uses accurate K-factor values calibrated to our specific press brakes and tooling for each material. We have developed our own bend allowance tables based on thousands of production runs, ensuring flat patterns unfold correctly every time. Our engineers also design parts with generous bend radii and adequate flange lengths to ensure manufacturability.Case StudyA client submitted a sheet metal enclosure design with sharp internal corners (0.5mm inside radius) in 3mm aluminum. The bend allowance calculated by standard formulas produced flat patterns that were 1.5mm short after bending. SOMI's engineers recognized the sharp radius required a different K-factor and recalculated the flat pattern using K=0.38 instead of 0.41. The corrected pattern produced parts within 0.2mm of the design intent.Industry DataThe most common mistake in sheet metal design is incorrect bend allowance, accounting for 60% of flat pattern errors (SME Sheet Metal Forming Conference, 2025). Using material-specific K-factor values rather than generic formulas reduces flat pattern errors by 80%. Modern press brakes with angle measurement feedback can automatically compensate for springback.Related QuestionsWhat are the most common metal bending techniques?What thickness and metals can be laser cut?What types of welding are used in sheet metal?What processes are involved in sheet metal fabrication?

Quick AnswerThe five most common sheet metal bending techniques are: air bending (90% of all bending, uses V-dies with the punch stopping short of the die bottom), bottom bending or coining (pressing the material fully into the die for precise angles), rotary bending (rotating tooling for complex profiles), roll bending (three rollers for curved panels), and hemming (folding edges for safety or strength). Each technique suits different applications and accuracy requirements.Air BendingAir bending is the most common technique, accounting for approximately 90% of all press brake work. The punch presses the sheet into a V-die but does not bottom out -- the bend angle is determined by punch penetration depth. Advantages: same tooling can produce multiple angles, requires 30-60% less tonnage than bottoming, and is suitable for all thicknesses. Accuracy: ±0.5-1 degree. Recommended die opening: 6-8x material thickness.Bottom Bending and CoiningBottoming presses the material fully into the V-die, while coining applies enough tonnage to permanently deform the material at the bend line. These techniques produce the most accurate bends (±0.3 degrees) but require specific tooling for each bend angle and 5-10x more tonnage than air bending. Used for precision parts requiring consistent bend angles.Rotary Bending and Roll FormingRotary bending uses a rotating tool that forms the material progressively, ideal for long parts with complex cross-sections. Roll bending uses three rollers arranged in a pyramid to produce curved panels, cylinders, and cones. These techniques are less common in general fabrication but essential for architectural metalwork, HVAC ducting, and structural sections.Hemming and SeamingHemming folds the sheet edge back onto itself to create a smooth, safe edge and increase stiffness. Common hems: flat hem (180-degree fold), open hem (about 135 degrees), and tear-drop hem (for edge clearance). Seaming joins two sheet edges by interlocking folds -- used for ductwork, enclosures, and containers.Why Choose SOMI Custom PartsAt SOMI Custom Parts, our press brake department is equipped with modern CNC machines featuring 7-axis backgauges and angle measurement systems. Our operators select the optimal bending technique for each part based on material thickness, bend radius requirements, and production quantity. We provide DFM feedback to optimize bend sequences and minimize tooling changes.Case StudyAn electronics enclosure required 12 bends including three 90-degree flanges, two 45-degree chamfered edges, and a 180-degree hemmed edge for safety. SOMI programmed a 12-step bending sequence on our CNC press brake, completing each enclosure in 3 minutes. The bend-to-bend consistency was within ±0.5 degrees across the entire 3,000-piece production run.Industry DataAir bending accounts for 90% of all press brake operations (Fabricators and Manufacturers Association, 2025). Modern CNC press brakes with angle measurement feedback can achieve first-piece correct setup in 70% of cases, compared to 30% for manual machines. This reduces setup time by an average of 60% and material waste by 40%.Related QuestionsHow to calculate bend allowance for sheet metal?What thickness and metals can be laser cut?What types of welding are used in sheet metal?What processes are involved in sheet metal fabrication?

Quick AnswerIndustrial fiber laser cutting achieves ±0.1mm (0.004") accuracy on materials under 3mm thick, ±0.2mm on 3-10mm materials, and ±0.3-0.5mm on thick materials over 10mm. Repeatability is ±0.05mm across parts in the same production run. Cut edge quality ranges from 6-25 Ra depending on material and parameters.Accuracy by Material and ThicknessThin sheet (0.5-3mm) mild steel/stainless: ±0.1mm positioning, ±0.05mm repeatability. Kerf: 0.1-0.2mm. Medium (3-10mm) steel/aluminum: ±0.15-0.2mm, kerf: 0.15-0.3mm. Thick (10-25mm) steel: ±0.3-0.5mm, kerf: 0.2-0.4mm. These tolerances apply to flat parts. Additional variation occurs during bending (±0.5 degrees) and assembly (±0.5-1mm for welded assemblies).Factors Affecting Laser AccuracyBeam quality: Higher-mode lasers produce wider kerfs and rougher edges. Focus position: Proper focus is critical for maximum accuracy. Assist gas: Nitrogen produces cleaner edges than oxygen for stainless. Material condition: Rust, oil, or coatings can affect cutting consistency. Thermal effects: Heat buildup in small parts can cause distortion. Machine calibration: Regular calibration is essential for maintaining accuracy.Edge QualityLaser-cut edges have three zones: a top edge with slight rounding (0.05-0.1mm), a smooth middle section, and a bottom edge with minor dross (0.1-0.3mm for most materials). Surface finish on the cut edge: 6-12 Ra for thin materials with nitrogen assist, 12-25 Ra for thick materials with oxygen assist. For most fabrication applications, laser-cut edges are acceptable without additional finishing.Why Choose SOMI Custom PartsAt SOMI Custom Parts, we maintain our fiber laser cutting equipment with regular calibration to ensure consistent accuracy. Our operators are trained to select optimal cutting parameters for each material and thickness. We perform first-article inspection on every new part design and provide dimensional inspection reports upon request. For parts requiring tighter tolerances than laser cutting can achieve, we offer CNC machining as a post-processing option.Case StudyA medical device company needed stainless steel components with cutouts and slots held to ±0.1mm for precise assembly alignment. SOMI laser-cut the parts from 1.5mm 304 stainless using nitrogen assist gas. First-article CMM inspection showed all features within ±0.08mm. The client was able to assemble the components without any fitting adjustments, and the production run of 5,000 parts maintained the same accuracy throughout.Industry DataFiber laser cutting accuracy has improved 40% over the past 5 years due to advances in beam quality, motion control, and adaptive focusing technology. Modern fiber lasers with 100-micron delivery fibers produce the most consistent cut quality, with edge roughness of 3-8 Ra achievable on thin stainless steel (Laser Institute of America, 2025).Related QuestionsWhat thickness and metals can be laser cut?What are the common metal bending techniques?How to calculate bend allowance?What processes are involved in sheet metal fabrication?

Quick AnswerIndustrial fiber laser cutters handle a wide range of materials and thicknesses: mild steel up to 25mm (1"), stainless steel 304/316 up to 16mm, aluminum up to 10mm, and brass/copper up to 6mm. A 6kW fiber laser can cut 12mm mild steel at 2 meters/minute, while a 12kW laser cuts 25mm mild steel at 0.5 meters/minute. Laser cutting produces heat-affected zones of 0.05-0.2mm.Thickness Capabilities by Power3kW laser: Mild steel to 12mm, stainless to 6mm, aluminum to 4mm. 6kW laser: Mild steel to 20mm, stainless to 10mm, aluminum to 6mm. 10kW laser: Mild steel to 25mm, stainless to 16mm, aluminum to 10mm. 12kW+ laser: Mild steel to 30mm, stainless to 20mm, aluminum to 12mm. The maximum thickness is also affected by the assist gas (oxygen for steel, nitrogen for stainless/aluminum).Cut Quality and TolerancesFiber laser cutting produces kerf widths of 0.1-0.4mm depending on material and thickness. Tolerance: ±0.1mm for thin materials (under 3mm), ±0.2mm for medium thickness (3-10mm), and ±0.3-0.5mm for thick materials (10-25mm). Edge squareness: typically 89-91 degrees. Surface finish: 6-25 Ra depending on material and cutting parameters.Materials That Can Be Laser CutExcellent cutting: Mild steel, stainless steel (304, 316, 430), galvanized steel, aluminum (5000, 6000 series). Good cutting: Brass, copper, titanium, Inconel. Challenging (reflectivity issues): Pure copper, high-reflectivity aluminum alloys (require specialized lasers or surface coatings). Fiber lasers handle reflective materials better than CO2 lasers because the shorter wavelength is less reflective.Why Choose SOMI Custom PartsAt SOMI Custom Parts, we operate 6kW fiber laser cutting equipment capable of handling material sizes up to 3000 x 1500mm. Our nesting software optimizes material utilization, typically achieving 80-85% material usage versus 60-70% for manual layout. We offer both oxygen-assisted cutting for thick steel and nitrogen-assisted cutting for clean, oxidation-free edges on stainless steel and aluminum.Case StudyA construction equipment manufacturer needed 500 steel brackets cut from 20mm mild steel plate with tight dimensional accuracy for a structural assembly. SOMI's 6kW fiber laser cut all brackets to ±0.2mm tolerance with clean edges requiring minimal grinding before welding. The client reported that the laser-cut parts fit perfectly in their weld fixture, eliminating the rework they frequently experienced with their previous plasma-cut parts.Industry DataFiber laser technology has advanced rapidly: a 6kW fiber laser in 2025 costs 60% less than a 3kW system in 2015, while cutting speeds have increased 3x. Fiber lasers now account for 78% of all industrial laser cutting installations, replacing older CO2 laser technology (Laser Institute of America, 2025).Related QuestionsHow accurate is laser cutting?What are the common metal bending techniques?What materials are used in sheet metal fabrication?What processes are involved in sheet metal fabrication?

Quick AnswerProfessional sheet metal fabrication follows six stages: (1) CAD design with flat pattern development, (2) material selection and coil/shearing, (3) cutting via fiber laser or CNC punch press, (4) forming on CNC press brakes with precision backgauging, (5) welding and assembly using TIG/MIG/spot welding, and (6) surface finishing including deburring, grinding, and coating.Stage 1: Design and EngineeringThe process begins with a 3D CAD model that is converted into flat patterns by the CAM software. The engineer calculates bend allowances, determines the bending sequence, and nests parts on standard sheet sizes to minimize material waste. DFM reviews identify potential forming issues, springback compensation, and optimal hole-to-bend distances (minimum 2x material thickness + bend radius).Stage 2: CuttingFiber laser cutting is the most common cutting method. A 3-6 kW fiber laser cuts steel up to 25mm, stainless up to 12mm, and aluminum up to 10mm with kerf widths of 0.1-0.3mm. CNC punch presses are used for high-volume runs with repetitive hole patterns. Waterjet cutting is used for thick plates and materials sensitive to heat.Stage 3: Bending and FormingCNC press brakes with backgauging systems precisely position the part and control bend angle. Modern press brakes with 7-axis backgauges and crowning compensation achieve bend angle accuracy of ±0.5 degrees. The bending sequence is programmed to avoid collisions and ensure consistent results across the production run.Stage 4: Welding and AssemblyWelding processes include TIG (for thin stainless and aluminum), MIG (for thicker steel), and spot welding (for high-volume assemblies). Welding fixtures ensure consistent alignment. Post-weld grinding and blending create smooth joints. Quality inspection includes weld gauge verification and dye penetrant testing for critical applications.Why Choose SOMI Custom PartsSOMI Custom Parts operates a complete sheet metal fabrication facility with fiber laser cutting, CNC press brakes, and certified TIG/MIG welding. We manage all six stages in-house, eliminating the quality and logistics risks of coordinating multiple subcontractors. Our engineers provide flat pattern optimization to maximize material utilization, and our quality team inspects every part at each stage of production.Case StudyA telecom equipment company needed 2,000 stainless steel equipment enclosures with complex cutouts, precision-bent flanges, and TIG-welded seams with a uniform #4 brush finish. SOMI's fab shop laser-cut all parts from 16-gauge 304 stainless, programmed a 7-stage bending sequence for the press brake, and TIG-welded the assemblies on custom fixtures. The entire order was completed in 5 weeks with 98.5% first-pass yield.Industry DataAccording to the Fabricators and Manufacturers Association, a well-equipped sheet metal fabrication shop can produce a simple enclosure from flat material to finished part in 15-30 minutes of labor. Fiber laser cutting has become the dominant cutting technology, accounting for 65% of all sheet metal cutting, up from 35% in 2020 (FMA, 2025).Related QuestionsWhen should I choose sheet metal over CNC machining?What materials are used in sheet metal fabrication?What are common surface treatments for sheet metal?How to choose a sheet metal fabrication provider?

Quick AnswerChoose sheet metal fabrication for: large enclosures (e.g., 19" racks, control panels), thin-walled parts (0.5-3mm), low-to-medium production (10-10,000 units), and designs requiring bent flanges, louvers, and welded seams. Choose CNC machining for: solid monolithic parts, tight tolerances (±0.001" vs ±0.010"), complex 3D geometries, small quantities under 50 units, and parts requiring threaded features and precision bores.When to Choose Sheet MetalSheet metal fabrication excels at producing box-shaped enclosures, cabinets, panels, and brackets from flat material that is cut, bent, and welded. It is more economical for large parts because material cost scales linearly with size, while CNC machining cost increases exponentially with part size. Sheet metal enclosures are lighter (thin walls), faster to produce (minutes per part for laser cutting + bending), and offer better heat dissipation through the thin metal surface.When to Choose CNC MachiningCNC machining is superior for: parts requiring tight tolerances on multiple faces, solid blocks with drilled and tapped holes, complex 3D surfaces and contours, small quantities where sheet metal tooling (bending dies, welding fixtures) would be uneconomical, and parts thicker than 6mm that cannot be formed from sheet metal.Cost ComparisonFor a typical enclosure, sheet metal fabrication at 100 units: $15-35 each. CNC machining the same enclosure from solid: $80-200 each. At 1,000 units: sheet metal $8-18, CNC machining $60-150. Sheet metal tooling (dies, fixtures) typically costs $500-$3,000 versus minimal tooling for CNC. At 10,000+ units and for parts thinner than 3mm, sheet metal is almost always the right choice unless exceptional precision is required.Why Choose SOMI Custom PartsAt SOMI Custom Parts, we offer both sheet metal fabrication and CNC machining services. Our engineers help you choose the optimal process based on your specific requirements for size, tolerance, quantity, and budget. For many projects, the best solution is a hybrid approach: sheet metal for the enclosure body and CNC machining for precision-machined mounting features, inserts, and close-tolerance bores.Case StudyAn industrial automation company needed 500 control panel enclosures measuring 600x400x200mm. CNC machining from solid aluminum would have cost $185 each with 3-week lead time. SOMI recommended sheet metal fabrication using 14-gauge cold rolled steel with laser cutting, CNC bending, and MIG welding. The cost was $28 each, lead time was 10 days, and the welded enclosure was strong enough for the application.Industry DataSheet metal fabrication is typically 3-8x more cost-effective than CNC machining for parts thinner than 3mm and larger than 300mm in any dimension (Fabricators and Manufacturers Association, 2025). For enclosure applications, sheet metal accounts for 85% of all manufactured enclosures worldwide, with CNC machining reserved for specialized applications requiring solid metal construction.Related QuestionsWhat processes are involved in sheet metal fabrication?What materials are used in sheet metal fabrication?What are common surface treatments for sheet metal?How to choose a sheet metal fabrication provider?

Quick AnswerTo choose the right sheet metal fabrication provider, evaluate five key areas: equipment capabilities (laser cutting power, press brake tonnage, welding certifications), material expertise (steel, aluminum, stainless steel, specialty alloys), quality control processes, engineering and DFM support, and proven experience in your industry. Always request samples and references before committing.1. Equipment and TechnologyModern sheet metal fabrication requires advanced equipment. Look for fiber laser cutting with at least 3-6 kW power for clean cuts up to 25mm thick mild steel. Press brakes should offer CNC backgauging and multiple V-die sizes for accurate bending. TIG, MIG, and spot welding capabilities should be available. Also check for finishing equipment like powder coating lines or wet spray booths.2. Material ExpertiseA qualified fabricator should demonstrate experience with cold rolled steel, galvanized steel, stainless steel (304, 316), aluminum (5052, 6061), and copper/brass. They should understand material properties, springback compensation for bending, and proper handling to prevent surface damage.3. Quality ControlAsk about their quality management system. Do they perform first article inspection? Are they ISO 9001 certified? Do they provide dimensional inspection reports? Can they offer material certifications? For critical applications, look for fabricators with weld procedure qualifications and NDT (non-destructive testing) capabilities.4. Engineering SupportThe best fabricators provide Design for Manufacturability (DFM) feedback. They can suggest bend radius optimization, hole-to-bend distance adjustments, and material gauge changes that reduce cost without affecting function. This collaborative approach typically saves 10-20% on project costs.Why Choose SOMI Custom PartsSOMI Custom Parts operates a full sheet metal fabrication facility with fiber laser cutting up to 6 kW, CNC press brakes with 7-axis backgauges, and certified TIG/MIG welding. Our engineering team provides free DFM analysis on every project, and our ISO 9001 quality system ensures consistent results. From prototypes to production volumes, SOMI delivers quality sheet metal parts on time.Case StudyA medical equipment manufacturer needed 500 stainless steel enclosures with consistent weld quality and a #4 brushed finish. SOMI fabricated the enclosures using laser-cut blanks, precision-welded on custom fixtures, and finished with uniform brushing. The client received all 500 units within 4 weeks with zero quality rejects.Industry DataThe global sheet metal fabrication market was estimated at $312 billion in 2025 and is expected to grow at 4.8% CAGR through 2030 (Grand View Research). Laser cutting accounts for approximately 35% of all sheet metal fabrication processes, making it the most widely used cutting technology.Related QuestionsWhat are the common materials used in sheet metal fabrication?What are the common surface treatment processes in sheet metal fabrication?When should I choose sheet metal over CNC machining?What thickness and types of metal can be laser cut?

Quick AnswerSheet metal surface treatments range from simple mechanical finishes to advanced chemical coatings. The most common processes include powder coating for durable color finishes, anodizing for aluminum corrosion protection, zinc plating for steel rust prevention, galvanizing for heavy-duty outdoor protection, and brush finishing for aesthetic appearance.Powder CoatingPowder coating is the most popular finish for sheet metal enclosures and structural parts. Electrostatically charged powder is sprayed onto the part, then cured in an oven to form a durable, uniform coating. It offers excellent impact and corrosion resistance, comes in any RAL color, and is more environmentally friendly than liquid painting. Typical thickness: 60-120 microns.Anodizing (Aluminum)Anodizing is an electrochemical process that thickens the natural oxide layer on aluminum, creating a hard, corrosion-resistant surface. Type II anodizing provides decorative colored finishes. Type III (hard coat anodizing) provides exceptional wear resistance for functional parts. Anodizing is integral to the aluminum surface and will not peel or chip.Zinc Plating and GalvanizingZinc plating applies a thin zinc layer to steel parts through electroplating, providing corrosion protection for indoor applications. Hot-dip galvanizing applies a thicker zinc coating by immersing parts in molten zinc, ideal for outdoor and marine environments. Clear, yellow, and black passivation finishes are available.Mechanical FinishesBrush finishing creates uniform linear grain patterns on stainless steel and aluminum, popular for architectural and consumer products. Bead blasting produces a uniform matte surface. Grinding and polishing remove surface imperfections and can achieve mirror finishes on stainless steel.Why Choose SOMI Custom PartsAt SOMI Custom Parts, we offer comprehensive surface finishing services integrated with our fabrication facility. This eliminates the logistics of sending parts to separate finishers. Our quality team inspects every finished part to ensure coating thickness, color consistency, and adhesion meet your specifications. We help you select the optimal finish for your application, budget, and environmental conditions.Case StudyAn outdoor telecom equipment manufacturer needed aluminum enclosures with 500+ hour salt spray corrosion resistance. SOMI recommended and applied hard coat anodizing (Type III) with a thickness of 50 microns. The finished enclosures passed 750 hours of salt spray testing and have been deployed in coastal environments for over 3 years without corrosion issues.Industry DataAccording to the Association for Materials Protection and Performance, proper surface treatment extends the service life of sheet metal parts by 3-5x compared to untreated parts. Powder coating is the fastest-growing finishing method with 7% annual growth, driven by its durability and environmental advantages over liquid painting.Related QuestionsWhat are the common materials used in sheet metal fabrication?How to choose a sheet metal fabrication provider?What surface finishing options are available for CNC parts?How does surface finishing affect part cost?

Quick AnswerThe most common sheet metal materials are cold rolled steel (most economical, good formability), galvanized steel (corrosion-resistant, ideal for outdoor use), stainless steel 304 and 316 (excellent corrosion resistance, food and medical grade), aluminum 5052 and 6061 (lightweight, corrosion-resistant), and copper/brass (decorative, conductive applications).Steel GradesCold Rolled Steel (CRS): The most commonly used sheet metal material. Economical, easy to form and weld, with a clean surface finish. Available in gauges from 30 ga (0.012") to 7 ga (0.187"). Suitable for indoor enclosures, brackets, and structural components. Galvanized Steel (GI): Steel with a zinc coating for corrosion resistance. Commonly used for outdoor enclosures, HVAC components, and automotive parts. Stainless Steel 304: Excellent corrosion resistance, food-safe, aesthetic finish. Used for food equipment, medical devices, and architectural applications.Aluminum Grades5052 Aluminum: The most formable aluminum alloy, excellent for bending and deep drawing. Good corrosion resistance, commonly used for marine and automotive applications. 6061 Aluminum: Higher strength than 5052, good machinability, and weldable. Used for structural frames, enclosures, and aerospace components. Both grades are available in thicknesses from 0.025" to 0.250".Specialty MaterialsCopper: Excellent electrical and thermal conductivity, antimicrobial properties, beautiful patina finish. Used for electrical components, heat exchangers, and architectural details. Brass: Good corrosion resistance, decorative appearance, low friction. Used for nameplates, decorative trim, and precision components. Spring Steel: High carbon steel, heat treated for spring applications like clips and brackets.Why Choose SOMI Custom PartsSOMI Custom Parts works with all standard sheet metal materials and many specialty alloys. Our engineering team provides material selection guidance based on your specific requirements for strength, corrosion resistance, weight, formability, and budget. We maintain material certifications for all supplied materials, ensuring full traceability and quality documentation.Case StudyA food processing equipment company needed stainless steel 316 hoppers for acidic food contact. SOMI fabricated the hoppers using laser-cut 16 ga 316 stainless, precision-bent and TIG-welded with sanitary welds. The finished hoppers passed FDA surface finish requirements and have been in continuous use for over 2 years without any corrosion issues.Industry DataSteel accounts for approximately 65% of all sheet metal fabrication by volume, followed by aluminum at 20% and stainless steel at 10% (FABRICATORS' MANUFACTURING Association, 2025). The trend toward lightweight design is driving increased use of aluminum and advanced high-strength steels in automotive and aerospace applications.Related QuestionsWhat are the common surface treatment processes in sheet metal fabrication?How to choose a sheet metal fabrication provider?When should I choose sheet metal over CNC machining?What thickness ranges can be laser cut?