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I hope that was a joke. If you don't seriously practice and verify by destructive testing (you've got your cutoff rear frame section for scrap) then have someone else weld it. No "maybe"! You have access to a proper MIG, but that MIG is a doorstop without a proficient operator. You already did it your way once and fucked up. Save "your way" for less dangerous/expensive choices until you develop more skill. All it takes is determination and taking your time!
Post pics of your practice joints before welding your frame.
Update: when this hardtail was welded on, it had reinforcement sleeves inside each tube at the weld location, well as 3 plug hole welds for each frame rail + 3 for the backbone. Would it still be too sketchy to just weld a bead over the cracks and primer them?
The problem with MIG is that its pretty easy to lay down a nice looking weld bead, that may not have great penetration. Dont lay a bead straight over the crack. It needs to be grooved out in a v shape. If it were my frame and cracked, i would v out the crack (find where it begins and ends, how deep it is). Id then lay a base TIG weld with 1/16'' filler and then a cap with 3/32" rod
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