welding round exhaust help

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ive have been practicing my welding on round exhaust pipe.   have a miller 140.  With the welder on the correct settings i still seam to burn through sometimes.  I have the speed set on auto. using .30 wire.  and 75/25 gas.  even with the heat below recommended settings i still seem to burn through sometimes.  Any tips? also with round pipe i find the only way is to lay a bead, spin pipe, lay a bead spin pipe.  Any tips on making one bead for a round pipe like that.. or not possible?thanks
Reply:I've always found it a pain to weld thin-wall tubing with a mig.  Its just hit or miss for me.  A good fit is key to this, as is perfect travel speed.  I've had the best results with the torch perpendicular to the tubing.-AaronJet 17.5" Drill Press1942 South Bend 16x84 Lathe1980s Miller 320A / BP --- 2013 Power Mig 2562012 Jet 7x12 Horizontal BandsawVictor O/A Setup
Reply:Done a good bit of exhaust pipe with my old 140. I always used the .024 wire for it though. As a matter of fact, any time I exceeded what I could do with the .024 I switched to flux core wire. It would be extremely hard to run one continuous bead around a pipe that small without some sort of lathe. Just trying to maintain travel speed, gun angle, body position etc would just be painful. You could probably get away with just one restart though by starting on the side of the pipe instead of the top and working your way up and over till you need to reposition to keep the angle. Just gotta practice vertical a bit and it cake. I've personally had horrible luck with overhead and haven't really spent any time practicing it due to lack of desire to get hit by my mistakes and a lack of gear that can handle it.Are you running any type of weave?NickESAB CaddyTig 2200iPowermax 45MM140 (Sold)
Reply:so you recommend .024 wire for exhaust welding?yeah mosly a back and forth or e montion
Reply:Originally Posted by Fadetoblack188so you recommend .024 wire for exhaust welding?yeah mosly a back and forth or e montion
Reply:ok, i have 24 just not in the welder at the moment.  i will give it a shot. thanks for ur help.
Reply:I have always run .030 in my machine.  I should try thinner material for my tubing butt joints, just for fun.  since I got my tig, I just use that for butt joints now.-AaronJet 17.5" Drill Press1942 South Bend 16x84 Lathe1980s Miller 320A / BP --- 2013 Power Mig 2562012 Jet 7x12 Horizontal BandsawVictor O/A Setup
Reply:I too suggest .023 wire, or stack a tack with .030, but that makes it hard to get a perfect weld with no leaks.Airco Heliweld II AC/DC HomeMade Wire FeederLincoln 255PLincoln HD130Everlast PP804x8 CNC TableWelding helps me build my hobbies and takes up time on the side.
Reply:For thin gauge material 0.23 can't be beat. I was sucked into welding some banding a while back. This might give you some ideas of what can be done. http://weldingweb.com/vbb/showthread.php?t=103861Is this a butt weld? How is your fit up? It needs to be tight or you'll burn through at the gaps. Sometimes switching from push to pull can help. Any photos?