Matching the welding process to the joint for strength, speed and finish.
MIG and TIG are different welding processes, each suited to different materials and finishes.
MIG welding is fast, gives good penetration, and deposits filler quickly. It suits frames, guards, hoppers, trays and most mild steel fabrication. With the right gas and wire it produces a smooth bead with manageable spatter. Use MIG for structural and hidden work.
TIG is slower but highly controllable. It suits thin sheet, stainless and aluminium where the weld must look clean, such as food-grade benches, visible handrails and cosmetic trim. TIG produces a neat bead without spatter, but it takes longer and requires cleaner preparation.
MIG is faster and deposits filler quickly, which keeps the cost down on structural and hidden work. TIG is slower and costs more per hour, but avoids the grinding and cleanup that a spattered weld needs on visible parts.
Whichever process is used, preparation decides the result. Clean material, correct fit-up and the right filler matter more than the process choice.