Thin-Gauge Sheet Metal Welding Guide: Avoid Burn-Through & Distortion

Short answer: Weld thin sheet with tightly controlled heat: pulse TIG or laser for stainless and aluminium, short-arc MIG or resistance spot for steel, with good fixturing, back-purge on stainless, and clamping or skip welding to limit distortion. Match the process to thickness and alloy to avoid burn-through.

At a Glance

Heat Is the Enemy

Thin sheet has almost no thermal mass, so excess heat burns through and warps the part. Process choice follows our TIG vs MIG Guide и Laser Welding Guide; distortion is managed per our Welding Distortion Guide.

Stainless and Aluminium

For stainless 0.5–1.5 mm use pulse TIG with argon back-purge to keep the root clean (see our Weld Stainless Guide). Aluminium needs AC TIG or pulse MIG and care with oxide; our Weld Aluminium Guide covers setup. Filler choice matters for both.

Coated and Galvanized Steel

Galvanized and coated sheet release fumes when welded, so ventilate and prefer resistance spot or short-arc MIG. Coating behaviour is in our Galvanized Supplier и Galvanizing Defects Guide; joint prep follows our Weld Edge Prep Guide.

Fixturing, Distortion and Inspection

Clamp to a heat sink, weld in short segments or skip-weld, and use copper backing where possible. Verify with the NDT methods in our NDT Guide и Weld Defects Guide. Our Stainless Sheet Supplier и Aluminium Sheet Supplier stock the thin gauges these jobs need.

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