Sheet Metal Forming for Industrial Manufacturing

A Technical Guide to Cutting, Bending, Welding, and Surface Finishing

Sheet metal forming is one of the fastest paths from concept to production for industrial products—especially when programs demand scalability, consistent quality, and cost efficiency. From equipment enclosures and electrical cabinets to structural chassis and machine frames, well-executed sheet metal fabrication reduces assembly complexity and supports stable production ramps.

I. SHEET METAL FORMING

Products

Machine/equipment panels
Equipment Enclosures
Brackets
Electrical cabinets
Structural chassis

Material: Carbon steel, stainless steel, aluminum and copper. …

Process

a. Cutting technologies

Fiber Laser: Laser is generated through fiber optic amplification → wavelength ~1.06 µm.Material: Carbon steel, stainless steel, aluminum, copper, etc.
CO2 Laser: Older technology; laser is generated from CO₂ gas → wavelength 10.6 µm.

Material: Carbon steel (20–25 mm), Stainless steel (15–20 mm), Non-metal materials (wood, plastic, acrylic, etc.)

Disk Laser: Thin-disk laser technology; high-end and less common in the market.
Direct Diode Laser: A newer technology with the highest electrical efficiency, though not yet widely adopted.

Laser Technology Comparison Table

Criteria	Fiber laser	CO₂ laser	Disk Laser	Diode Laser
Electrical Efficiency	* * * *	*	* * *	* * * * *
Thin Sheet Cutting Speed	* * * * *	* *	* * * *	* * * *
Thick Steel Cutting	* * *	* * * *	* * * *	* * *
Aluminum / Copper Cutting	* * *	* *	* * * *	* * * *
Accuracy	* * * *	* * *	* * * *	* * *
Maintenance	Low	High	Medium	Low
Market Trend	Most Popular	Declining	Hi-end	Emerging

SMCTECH’s factory is equipped with a modern Fiber Laser cutting system powered by an IPG (USA) laser source.

IPG Laser source	Carbon steel	Stainless steel	Alu/Copper
3kW (02)	~12mm	8mm	6mm
6kW (01)	~20mm	16mm	10mm

b. Turret Punch

Products: Electrical cabinets, automation panels, enclosure parts, mass-production sheet components.
Materials: Carbon steel, stainless steel, aluminum, galvanized steel
Turret Punch Technology:

Turret punching is a mechanical sheet metal fabrication process where a rotating turret holds multiple punches and die tools. The machine selects tools automatically to punch holes, slots, forms, embossing, and louvers into sheet metal.

Thickness Range: 1.0 to 3.0mm

Advantages

Very cost-effective compared to laser for high-volume production
High repeatability and stable quality
Capable of forming features
Fast for repetitive hole patterns

Disadvantages

Limited flexibility for complex contours
Tooling cost for special shapes
Burrs may require secondary deburring

Direct comparison

Criteria	Turret Punch	Fiber Laser
Speed (repetitive holes)	Very High	Medium
Complex contour cutting	Limited	Excellent
Forming capability	Yes	No
Thin sheet cost efficiency	Very High	Medium
Tooling cost	Required	Not required
Flexibility	Medium	Very High

c. Turret punch + laser combinations

This integrated system combines a turret punch and a fiber laser cutting head in one machine platform. The punch performs forming and repetitive holes, while the laser handles complex contours and precise external cutting.

SMCTECH operates an advanced Prima Power punch+laser combination system from Italy, allowing us to efficiently manufacture high-quality components while achieving greater productivity and cost efficiency compared to independent punching or laser cutting processes.

Direct comparison

Criteria	Turret Punch	Turret + Laser Combination
High Hole Density Parts	Excellent	Excellent
Risk of Thermal Distortion	None	Very Low
Complex Outer Profile	Limited	Excellent
Edge Quality	Medium	Excellent
Productivity	Medium	Very High
Flexibility (*)	Medium	Very High

(*) It saves a lot of time if the product requires both punching and laser cutting.

d. Bending/Forming

Bending/forming is a critical process in sheet metal fabrication, where flat sheet material is shaped into angular or curved geometries using controlled force without removing material.

Material: Steel, stainless steel, aluminum, galvanized steel, copper.

CNC Press brake technology: A CNC press brake uses a punch and die system to apply controlled force and bend sheet metal along a programmed axis.

e. Folding

Folding is a sheet metal forming process used to bend large panels with high precision while minimizing surface marks and deformation.
Unlike traditional press brake bending, folding machines move the sheet while the clamping beam holds the material in place, resulting in superior dimensional stability.

Material: Steel, stainless steel, aluminum, galvanized steel

f. Stamping Press

Stamping is a high-efficiency metal forming process that uses mechanical or hydraulic presses combined with dedicated dies to shape sheet metal into specific geometries.

It is widely used for mass production of precise and repeatable metal components across various industrial sectors.

Material: Steel, stainless steel, aluminum, galvanized steel, copper, brass.

SMCTECH is fully equipped with advanced sheet metal forming technologies to ensure professional handling of designs from various industrial sectors, while optimizing production cost and efficiency.

Criteria	Press Brake	Folding	Stamping (Press Forming)
Investment Cost	Medium	High	Very High (die cost)
Tooling Cost	Low–Medium	Low	Very High
Production Volume	Low–Medium	Medium	Very High
Flexibility	Very High	High	Low
Setup Time	Medium	Fast	Long (die setup)
Surface Protection	Medium	Excellent	Excellent
Large Panel Capability	Limited	Excellent	Limited
Thick Material	Excellent	Limited	Medium
Design Change Adaptability	Very High	High	Very Low
Unit Cost (Low Volume)	Low	Medium	High
Unit Cost (High Volume)	Medium	Medium	Very Low
Automation Level	Medium	High	Very High

g. Welding

TIG Welding (GTAW – Gas Tungsten Arc Welding)

Material: Stainless Steel, Aluminum, Thin carbon steel

Commonly used for semiconductor equipment and cosmetic-visible parts.

Advantages:

High precision
Clean and aesthetic weld seam
Low spatter
Ideal for thin materials

Disadvantages:

Slower process
Requires skilled operator

MIG Welding (GMAW – Gas Metal Arc Welding)

Material: Carbon steel, Stainless Steel, Medium & Thickness material

Common for machine frame and structural fabrication.

Advantages:

High productivity
Strong weld penetration
Suitable for thicker materials
Cost-effective

Disadvantages:

More spatter than TIG
Lower cosmetic quality (may require grinding)

Laser Welding

Laser welding is a focused laser beam that melts the material at the joint area.

Material: Thin sheet metal, stainless steel, carbon steel, Aluminum, galvanized steel

Advantages:

Very low thermal distortion
Narrow weld seam
High welding speed
Minimal post-processing required
Excellent cosmetic appearance
High precision for thin materials

Disadvantages:

High equipment investment
Joint fit-up must be precise
Not ideal for large gap filling
Requires safety control due to laser radiation

Spot Welding (Resistance Welding)

Material: Thin sheet metal, overlapping sheet joints

Widely used in cabinet and enclosure production.

Advantages:

Very fast
High repeatability
Ideal for mass production

Disadvantages:

Limited to thin materials
Not suitable for structural frames

Robotic Welding

We deploy robotics with MIG welding source for repetitive and large volume production, especially in module welding applications for machine frame manufacturing, ensuring high consistency, productivity, and structural integrity.

Comparison: MIG vs TIG vs Laser Welding

Criteria	TIG	MIG	Laser Welding
Precision	High	Medium	Very High
Speed	Low	High	Very High
Heat Input	Medium	High	Very Low
Distortion	Medium	Higher	Very Low
Cosmetic Quality	Excellent	Moderate	Excellent
Thick Material	Limited	Excellent	Medium
Automation Capability	Medium	High	Very High
Investment Cost	Medium	Medium	High

SMCTECH can provide products in compliance with standards such as:

AWS D1.1 (Structural welding)
ISO welding standards

h. Surface treatment

Anodizing

Anodizing is an electrochemical process that increases the thickness of the natural oxide layer on the surface of aluminum. This oxide layer enhances corrosion resistance, wear resistance, and surface hardness.

Main types of anodizing which we provide:

Type II – Sulfuric Acid Anodizing

Thickness: 5–22 µm
Decorative and corrosion protection
Can be dyed (black, clear, etc.)

Type III – Hard Anodizing (Hard Coat)

Thickness: 25–65 µm
Very high hardness (up to 60–70 HRC equivalent)
Used in aerospace and high-wear components

Common standards and compliance:

MIL-A-8625 (now MIL-PRF-8625)
RoHS-compliant

Chromate conversion coating (Alodine / Chemical Film)

Chromate conversion coating is a chemical treatment that creates a thin protective film on aluminum surfaces. Unlike anodizing, it does not significantly increase thickness and maintains electrical conductivity.

Thickness

Very thin layer (~0.2–2 µm)
Minimal dimensional impact

Common standards and compliance:

MIL-DTL-5541
RoHS-compliant versions available (Trivalent chromate)

Comparison: Anodizing vs Chromate Conversion

Criteria	Anodizing	Chromate Conversion
Corrosion Resistance	High	Medium–High
Wear Resistance	Very High	Low
Thickness	5–70 µm	0.2–1 µm
Dimensional Impact	Moderate	Minimal
Electrical Conductivity	No	Yes
Surface Hardness	Very High	Low
Cost	Higher	Lower
Cosmetic Finish	Decorative options	Industrial appearance
Suitable for Grounding	No	Yes

Powder coating

Powder coating is a dry finishing process in which electrostatically charged powder particles are sprayed onto metal surfaces and then cured in an oven to form a durable protective layer.

Spray painting

Spray painting uses liquid paint (epoxy, PU, or other industrial coatings) applied through spray guns in controlled paint booths.

Heavy phosphate coating

Heavy phosphate coating is a chemical surface treatment process that creates a thick crystalline phosphate layer on steel surfaces to improve corrosion resistance and paint adhesion.

Comparison of Surface Finishing Methods

Criteria	Powder Coating	Spray Painting	Heavy Phosphate
Corrosion Resistance	High	Medium–High	Medium
Surface Appearance	Excellent	Very Good	Matte/Industrial
Environmental Impact	Low VOC	Higher VOC	Low
Suitable for Large Frames	Medium	Excellent	Excellent
Chemical Resistance	High	High	Medium
Used as Final Coating	Yes	Yes	Pre-treatment