Two welders on one work piece?

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I'm sure this will be an easy one for one of you guys. I'm working on a large project and to increase production it will help to have two guys burning simultaneously. Our scenario will probably involve one engine drive and one plugged in, possibly two plugged in. Both stick welders. The work is basically a 40' long by 10' dia. steel pipe. Are there any problems running two different machines on one work piece?
Reply:Not in my experience.  Heck, we've done two man team socket welds for boiler fittings.  You start the arc, work your way around to where you can't reach anymore, and your buddy comes in and lights the arc on his electrode right off yours.  By the time you're done cleaning, the slag off your side, you're ready to burn again.
Reply:It is done all the time, you will be fine.Disclaimer; "I am just an a$$hole welder, don't take it personally ."
Reply:Thanks guys. I thought so...and now I know! Appreciate the quick replies
Reply:If you get shocked it will just be twice as bad thats all......zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:They've mentioned doing just this in several of my classes.  Important notes:1 - Same polarity on both machines.  No mixing AC and DC, or DCEN and DCEP.2 - If welders use 3 phase power, make certain power hookups are identical, phase for phase.Check OCV between both stingers.  Should be ~80Volts or less.  This is safe.  If voltage is higher, you've broken one of the rules listed above, and someone could get hurt.Otherwise, should be a piece of cake.
Reply:We are putting up a new building on my campus and there is probably 3-5 stick welders running at a time...all engine drive...probably all DCEN.Smithboy...if it ain't broke, you ain't tryin'.
Reply:Polarity or phase won't matter as long as each machine is grounded to the work. Just as a computer has 5 volts and 12 volts each with both polarities present at the same time on a common chassis. If each machine is grounded to the work, your stinger will use only its own ground.The only thing to worry about is a MALFUNCTIONING MACHINE, which shouldn't be in use anyway. Such a failure could be where the transformer's primary and secondary windings come in contact with each other. The machine will still work, but it is dangerous even when operating by itself.
Reply:Somedays  I am welding 72" -108" pipe. Usually we have 2 welders inside doing roots and 2 outside doing fill and caps. Never a problem. Here is a pic 2 guys on outside using fluxcore uphill for fill and cap. Root and hot pass was done downhill 6010Last edited by westcoast welder; 01-22-2008 at 11:09 PM.
Reply:Some inverters may have problems being used together on the same structure.  Years ago, I gave a Pow-Con to another shop, they were never able to run it together with their own machines.  I don't remember what the problem was, I just remember it didn't work.  This may not be true with the more recently built machines.  Transformer machines or engine drives would never be a problem.
Reply:It's unavoidable on building construction sites, assembly lines, shipbuilding, power plants, etc.Like already said, don't use malfunctioning machines and it will be fine, whether engine drive or not.Hobart Stickmate LX AC/DC, Millermatic 252 & 30A spoolgun, Thermal Arc 185 TIG, Miller BWESmith Oxy-AcBridgeport 2J , South Bend 42" 9AHusky 7.5 HP 22.3 CFM 80 gal compressor