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I run er70s6 in that size and shielding vertical up. Works great. The inverted-V is effective. If you have never ran it uphill then find a little scrap to practice on first. It takes a bit to get it sometimes.
Maxstar 150 STH
Victor Journeyman OA
When it comes to vertical up you need to turn the heat down from what you would weld the same material at because your staying in the same area which gives you the heat for penetration, and like someone said in a earlier post, you need to pause at the outside edge to let it fill so you eliminate under cut.
I run less heat and wire, quick across the middle, pause on the edges so they fill. I have trouble with a "saggy" looking bead if I run too much wire, and or am not quick enough jumping to the other side.
We made bumper for our crane, while he was gone I fooled around with it until I got it looking like I tig the weld. Didn't say a word, when he came by yesterday, inspecting was very happy with the appearance so I told him I ran it uphill, he told me to grind out and reweld, I refused
Your boss is wrong. Up hill is one of the safest welds in mig. Meaning it is easy if your not experienced to make a weld look good and not have proper penetration foremost downhill then flat. But it's almost impossible to weld up and not have good penetration. So if your vert up weld looks good your almost assured u have good fusion & strong weld. In my opinion as far as mig is concerned vert up is definitely doable (do it all the time) and a strong weld.
Ps. I rarely ever weld mig down for any structural type weld or for any weld unless it's just for looks only, no strength required. It's vert up for me all the way.
I use stick an fc all the time. Imho it will be an even stronger weld provided you have taken all steps to prep because you don't have flux to worry about, therefore no inclusions...anyway he is grinding away
Tell your boss he needs to read this, It sounds like you guys weld a lot of structural as I also do which never sees maximum loading, I also weld a lot of heavy equipment also where the welds are stressed closer to there limits.
Vertical up is the only way to go, The only time I might do a down hill mig is tacking sheet metal together which is not structural.
He has 6G certs. But he does not know wire. He fought me two years over getting a suitcase and picking up the production. About 8 years ago I got a suitcase, learned how to weld with 232 .072 innershield and for handrail in the field I would use.045 212 innershield. The production has picked up so much he let got rid of the dead head we had, and now I do all the welding. He does not know how to use his little 110 wire feed, he leaves pin holes in weld, doesn't prep his work, burns it with torch, does not remove slang prior to trying to weld. Don't get me wrong, he is an excellent employer, just no longer a welder. That's my game in our outfit and I'm learning as much as I can.