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i remember you were trying to weld some kind of roll cage in something. and you werent sure if your welds were gonna be alright.i build DIRT modified race car chassis. in this pic the tubing that you see is:the piece comming down is 1 1/2 .120 wall DOMthe pieces that are kinda horizontal are 1 1/2 .095 DOMit is welded with a MM 251, .030 national standard bare wire. and a 75/25 mix gasif ya have any ?, i'll answer what i can. Attached Images
Reply:very, very nice welds.  enough said.
Reply:thanks butcher, its taken some time to get all my welds consistent.
Reply:Are you weling from the bottom up or top down?  The problem I seem to be having is the recommend wire speed is so fast for .135 wall it makes it very hard to follow the curve.  I can weld striaght with no problem.I am thinking of use FCAW method because the wired speed is around 2.5 instead of 7 so I can take my time a bit more but then you got the smoke problem.Build a Barstool Racer at BarFlyRacers.com!
Reply:One more question.  Did you just run a stright weld without any weaving or forward and backward motion?Someone once told me when welding tubing you should make small "e"'s as you weld it.  Sounds weird to to me.Thanks!Build a Barstool Racer at BarFlyRacers.com!
Reply:i start at the top, and go 180* around the tube using the "tiny circles" motion.the problem i seen with the weld you showed, was that it was way to hot for what your doing. usually when the guys put cars together for me to weld, i always tell them to leave me a lil gap, for extra penatration.i would say to you is, turn down the heat and WS and use a gap to your advantage.
Reply:No let me ask you.  Working from top to bottom on verticle will give you less penetration then?  Or because of the little gap and the circle motion does that actually slow the movement enough to get correct penetration?Is there a certian way to do the circles ex. clock wise -vs- counter clock wise?Thanks!Build a Barstool Racer at BarFlyRacers.com!
Reply:well when i weld down hand on tubing/pipe and there is a gap, you can actually watch the weld burn into the pipe.and the way i weld, my gun position is always pointed up, that way its kinda holding the puddle up, and pushing the wire into itself.it all depends which joint im welding on the direction of the "circles".sometimes on a single joint i hafta change direction of the circle to be able to  get my wrist around the corner.
Reply:Ok, thanks for your help!  I will pratice some this week.Build a Barstool Racer at BarFlyRacers.com!
Reply:Very nice MIG welds, how many times would you say you have to stop and reposition on a weld like that, it looks almost like you made them in a single pass, or your really good at covering up your start and stop marks, awesome job!www.jmfabrications.comLincoln Precision TIG 375Lincoln Precision TIG 275Lincoln Power MIG 255Lincoln Power MIG 140CMiller Dynasty 350 (x2)TD Cutmaster 80
Reply:any welds on the chassis i can make in one pass, i do. some times i wait till i reposition the car just so i can get most of the welds on it the same.
Reply:Awesome!  I wish my hand was that steady where I could go all the way around in 1 pass, I usually have to reposition at least twice..........www.jmfabrications.comLincoln Precision TIG 375Lincoln Precision TIG 275Lincoln Power MIG 255Lincoln Power MIG 140CMiller Dynasty 350 (x2)TD Cutmaster 80
Reply:mild steel ? or chrome moly ?b-
Reply:the modifieds we build are DOM mild steel. anywhere from .065 to .120 wall.the go carts we build are 4130 chromemoly, that are TIG welded.