The welding process you specify affects three things buyers actually care about: finish quality, corrosion resistance, and cost per joint. Picking the wrong one for the material doesn't just look worse — on stainless and aluminum, it can actively undo the properties you're paying for the material to have.
TIG welding: precision over speed
TIG (Tungsten Inert Gas) welding gives the operator the most control of any common process — a separate filler rod, a stable arc, and no spatter. That control is why TIG is the standard choice for stainless steel and aluminum, and for any joint where the weld itself is visible or exposed to weather.
The tradeoff is speed: TIG is slower and more operator-dependent than MIG, which shows up directly in cost per joint. It earns that cost on stainless and aluminum, where MIG's higher heat input can degrade corrosion resistance right at the seam — the one place you can't afford it to fail.
MIG/MAG welding: throughput on structural steel
MIG/MAG feeds a continuous wire electrode, which makes it faster and more forgiving than TIG — better suited to longer structural welds on mild and structural steel, where finish and corrosion resistance at the joint are less critical than deposition rate. Most structural steel frames, brackets, and chassis assemblies are MIG/MAG work.
Laser welding: thin gauge, minimal distortion
Laser welding concentrates enough energy into a small enough spot that heat-affected zones stay narrow — which matters most on thin-gauge sheet, where MIG or TIG heat input would warp the part. It's the right call for precision joints where dimensional stability after welding matters more than joint mass.
Spot welding: sheet sub-assemblies
Spot welding isn't really competing with the three above — it's for a different job: joining overlapping sheet metal at discrete points rather than along a continuous seam. It's fast and cheap for sub-assemblies that don't need a continuous weld bead, which is most sheet enclosures and panel assemblies.
Matching process to material
| Material | Recommended process | Why |
|---|---|---|
| Stainless steel | TIG | Preserves corrosion resistance at the joint |
| Aluminum | TIG (laser for thin gauge) | Control over heat input and finish |
| Structural steel | MIG/MAG | Throughput on longer welds |
| Sheet steel sub-assemblies | Spot | Fast, low cost per joint |
Why this is where cutting-only vendors stop being useful
Digital cutting platforms are good at exactly that — cutting. Most don't weld at all, and the ones that do typically offer one process, not four. A part that needs TIG-welded stainless brackets spot-welded to a MIG-welded steel frame either goes to three vendors, or to one shop that runs all four processes in-house.
We run TIG, laser, MIG/MAG and spot welding in the same shop as our cutting and machining lines. See our welding services page for material-specific process notes, or request a quote with your drawing.