Welding wont be any different from HREW tubing.
The thickness will dictate how well your 135amp MIG will penetrate.
I think somewhere around 0.120 wall thickness is the practical limit for single pass welding with a 110v welder.
Eh, not really. My HH140 will easily blow a hole through .120 maxed out. Even the little Century 125 i had before welded .120 best at about 75%... this is all on flux wire of course. Most 125 110v welders ive seen are rated at 3/16" max single pass on flux, so you shouldnt have any problems with .120 wall on either flux or the bottle. That 135 would run .120 more than adequate and it would be set low enough as to not get into the duty cycle.
Your weld should be plenty strong using the 135 MIG on .120 wall tube at the appropriate setting.
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