BioMax
+1y
The difference between MIG and TIG is very minimal. They both use electricity to create a "puddle" and then you add the filler metal. MIG just does it all in one step.
MIG stands for "metal inert gas." Metal is the electrode and just happens to be the filler metal and it uses an inert gas to shield the weld.
TIG stands for "tungsten inert gas." The tungsten is the electrode and innert gas is the shield then you add you filler metal.
The reason TIG is so "magical" is because it has a constantly adjustable arc and you only add as much filler metal as you need. You can "lay" a beautiful MIG weld that is totaly worthless, but a TIG weld is not forgiving, at all. If it doesn't join the two metals, it doesn't look like it did (if that makes any sence.)
Many sanctioning bodies requre that 4130 be TIG welded, but mild steel can be MIG or TIG welded. The machines are rated in pretty much the same ways. A 200 amp TIG is the same as a 200 amp MIG. So it stands to reason that anything you can do with a MIG you could do with more control with a TIG.
As has been stated earlier, both MIG and TIG work, but TIG is just more controlable and weeds out the non-talented welders pretty fast.
I hope this helps...