MIG and TIG both produce sound welds—the difference is where each shines. MIG (wire-fed) welding generally wins on speed, deposition, and heavier sections, which keeps cost down on structural and production work. TIG welding trades speed for control, delivering precise, clean-looking welds on stainless steel, thin material, and parts where appearance or purity matters.
How does MIG welding work, in practical terms?
MIG feeds a consumable wire through the torch while shielding gas protects the puddle. Because filler feeds continuously, travel speeds are high and long joints fill quickly. That makes MIG the default for frames, skids, hoppers, and most carbon-steel weldments in custom fabrication.
What makes TIG welding different?
TIG uses a non-consumable tungsten electrode, with filler added separately by hand. The welder controls heat and filler independently, which produces exceptionally clean, controlled beads. The cost is time—TIG is slower, so it is applied where the result justifies it.
Which process is better for stainless steel?
Both weld stainless, but TIG dominates where corrosion resistance, sanitary finish, or appearance drive the job—food-processing equipment being the classic Midwest example. Lower, more controllable heat input helps preserve the properties that make stainless worth buying. Our welders carry AWS D1.6 certification for stainless structural work alongside AWS D1.1 for carbon steel.
When does MIG make more sense than TIG?
When the part is thicker carbon steel, when joints are long, when production quantity matters, or when the weld will be painted or hidden. Choosing TIG there adds hours without adding value. A good shop matches the process to the requirement instead of applying one habit to everything.
What about laser welding?
Laser welding adds a third option: very low heat input, minimal distortion, and high speed on the right joints. We covered it in detail in our laser welding post—for thin material and distortion-sensitive assemblies it can outperform both traditional processes.
Does the choice change the price of a fabricated part?
Yes, mainly through labor hours. TIG on a long carbon-steel joint can multiply weld time compared with MIG. That is why drawings that specify a process (rather than a result) sometimes cost more than they need to—specifying the requirement lets the fabricator pick the efficient process that meets it.
How does each process show up on the invoice?
Welding is bought by the hour, so process speed is cost. MIG’s continuous wire feed lays metal several times faster than TIG on comparable joints, which is why a carbon frame quoted as TIG-only can come back at a startling number. TIG’s hours buy something real—control and finish—so the question on every joint is whether that purchase serves the part or just the specification’s habit.
What do codes and procedures say about process choice?
Structural codes such as AWS D1.1 qualify procedures and welders per process—a shop running both MIG and TIG maintains qualifications for each. What the code cares about is that the deposited weld meets the requirement, made by a qualified welder following a qualified procedure. That is worth remembering when comparing shops: certifications for the material and process you need matter more than a brand-name process preference.
How do cleanup and finish differ after welding?
TIG leaves clean, spatter-free beads that often need no post-work—a real saving on stainless where every cleanup pass risks contaminating the surface. MIG can leave spatter that must be removed before painting or finishing, which claws back a little of its speed advantage on cosmetic work. On hidden structural joints, nobody pays for pretty; on a food-plant guard rail everyone sees, they do.
Frequently asked questions
Not inherently. Properly executed welds from either process meet the strength the joint design requires. Code-qualified procedures and certified welders matter more than the process label.
TIG or laser welding, because heat input is easier to control and distortion stays manageable. MIG can work with the right settings, but burn-through risk rises as material thins.
Yes, and it is common—MIG for the structural carbon frame, TIG for the stainless contact surfaces, each where it belongs.
Ask about AWS D1.1 for structural carbon steel and AWS D1.6 for stainless. Certified welders working to qualified procedures are the baseline for code work.
Yes—our welders carry AWS D1.1 and D1.6 certifications, with procedures matched to the material and process each joint requires.
Match the process to the part
A & P Fabricating Solutions, LLC runs MIG, TIG, and laser welding from our Appleton, Wisconsin shop for customers across the Midwest. Send your drawings to the quote request page and we will quote the process that fits the requirement.
