OK - I did not follow the other thread so therein lies the disconnect on my part.
However, to be fair, we should further divide MIG into subprocesses. A great deal of large industrial products are made with MIG spray arc so the basic process is sound for heavy weldments. Of course, you can't get there from here with less than 200 amps and a high percentage of Ar in the shielding gas so you are either pulsing or short arc - both of which yield less penetration. A 135 amp unit would most certainly not provide much penetration in a critical application and welding from both sides.
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