Watch "Subarc positioner" on YouTube

admin

Subarc positioner:  some of my subarc
Reply:Can someone move this to show us what you welded today
Reply:I wish our sub arcs had a laser.
Reply:Originally Posted by TimmyTIGI wish our sub arcs had a laser.
Reply:I'm looking into that soon as we start sub arc-ing again..
Reply:That is neat to see! What is the "stuff" that gets sucked up behind the weld?12v battery, jumper cables, and a 6013.I only have a facebook page. https://www.facebook.com/pages/VPT/244788508917829
Reply:Originally Posted by VPTThat is neat to see! What is the "stuff" that gets sucked up behind the weld?
Reply:Some more sub arc positioner we are building twin air compressor tanks 5 foot diameter 18 foot long
Reply:That is cool! Thanks much for sharing the videos!12v battery, jumper cables, and a 6013.I only have a facebook page. https://www.facebook.com/pages/VPT/244788508917829
Reply:Why sub arc?  What is the advantage? How does one go about getting the weld parameters setup, if/when you can't see what's going on?Is pretty cool stuff,  just don't understand it.
Reply:Sub arc is really fast, you deposit a lot of metal, plus you just keep going round and round, don't have to stop till it's finished. Unless you go over the interpass temp.A while back I made a 24" standard wall weld in an hour and a half with MIG root/sub arc fill and cap.You just have to fool with it for a while till you see what works, pretty soon you get a feel for it.
Reply:Here's some stuff I did last year, this is where the sub arc shines.
Reply:Originally Posted by Teggy1Why sub arc?  What is the advantage? How does one go about getting the weld parameters setup, if/when you can't see what's going on?Is pretty cool stuff,  just don't understand it.
Reply:Originally Posted by TimmyTIGHere's some stuff I did last year, this is where the sub arc shines.
Reply:Originally Posted by colindstarkWhat machine, flux, wire, and material?
Reply:Is it just me or is the start of that sub-arc weld full of porosity once the slag falls off? The bead looks concave with a line down the middle full of porosity. Usually, there's just a piece of wire in front of the flux nozzle to line up where you want the weld to be and to judge the height. I worked in a few vessel shops and no way could you run sub-arc directly over a MIG root. They'd run a hot 3/16" and sometimes 1/4" 7018 hot pass before sub-arc. Burn through with sub-arc is not something you want to have to repair. By the time you realize it burnt through, it's a big mess. Sub-arc flux can be ground up and reused. Vessel shops normally use new flux but a lot of less critical shops like tank shops recycle it and use a 50/50 new and recycled mix. Running out of flux and getting a flash from sub-arc isn't fun either but for heavy welding it's the fastest and one of the most reliable welding methods. Beer kegs were one of the first applications for sub-arc.
Reply:We run over MIG roots with 3/32 sub arc wire all the time. You just have to move out muy pronto. Haven't had a burn thru in a long time.
Reply:Originally Posted by Welder DaveIs it just me or is the start of that sub-arc weld full of porosity once the slag falls off? The bead looks concave with a line down the middle full of porosity. Usually, there's just a piece of wire in front of the flux nozzle to line up where you want the weld to be and to judge the height. I worked in a few vessel shops and no way could you run sub-arc directly over a MIG root. They'd run a hot 3/16" and sometimes 1/4" 7018 hot pass before sub-arc. Burn through with sub-arc is not something you want to have to repair. By the time you realize it burnt through, it's a big mess. Sub-arc flux can be ground up and reused. Vessel shops normally use new flux but a lot of less critical shops like tank shops recycle it and use a 50/50 new and recycled mix. Running out of flux and getting a flash from sub-arc isn't fun either but for heavy welding it's the fastest and one of the most reliable welding methods. Beer kegs were one of the first applications for sub-arc.
Reply:Looks like they don't believe in prepping where you work either.
Reply:I have till 12/15/14 to get 2 tanks done 4 weeks total 5ft diameter 18ft long 10 nozzles ill post pics tomorrow, but you are right no excuse for no prep.  Oh they used this as the demo for our ASME audit had three from Hartford Steam and Boiler along with a suit from national board and our two QC's looking over my shoulder as i put in the root after i cut, pinched, rolled, fit, and hung a head on one of the tanks by myself in 23 hours got done the day before the audit.
Reply:Try running twin 5/64 LA-75 860 flux 900 amps NA -5 controls DC-1000 240 lbs in 8 hrs every day! Bridge work at its best.
Reply:Originally Posted by PavinsteelmanTry running twin 5/64 LA-75 860 flux 900 amps NA -5 controls DC-1000 240 lbs in 8 hrs every day! Bridge work at its best.
Reply:Here's some more
Reply:Its a great process for production.  Very old.  I suspect pre WW2.  First ones I saw used radio tubes.  Hottest I saw was a guy maxing things out... 980 amps on one 5/32 wire. He was way outside limits.  Looking at the red underneath the plate I was convince he would blow through but he made the weld.
Reply:Thanks for the info guysLast edited by Teggy1; 12-12-2014 at 10:32 AM.