TIG Welding a Carbon Steel Tee Joint MultiPass Fillet Weld

Subscribe to my channel for more weekly videos.
https://www.youtube.com/user/weldingt...

Visit my store at https://weldmongerstore.com for TIG cup Kits, TIG Fingers, Gloves, Tungsten, Filler metal, and other quality welding tools. New products being added weekly.

I got a comment from a student a few weeks ago who was having trouble with a multi pass, fillet TIG weld at his welding school.

The conversation went like this.

“Hey Jody. Any chance of doing a 2F 6-bead to joint on 1/4 steel with TIG? Kinda having trouble with that in school for some reason. Doing the lay wire technique and this joint just will not come out like it is supposed to. The root goes in fine, but subsequent passes are harder to get in for some reason”

ME


“I will put it on my list but you will probably be done before I could get it shot lol. But let me ask some details anyway...Is it a tee joint? stringers or weave? and are you required to do lay wire? Any particular size wire? If root goes in good, but subsequent passes go bad , it could be surface oxidation so a gas lens might help along with letting it cool between passes along with wire brushing every pass.”


@connormarek1028  

“Hi Jody. No worries. I`m sure it will take time to get videos out. I can answer your questions though.
1) 2F T-joint on 1/4 carbon steel plate.
2) stringers (but slight weave) and I`m required to do lay wire for some reason. Walking the cup is not allowed at all BTW. My instructor wants 6 beads.
3) 1/8 ER70S-6 filler rod. I`m welding @ 140amps on a Lincoln Aspect using Hi-freq start W/ a foot pedal. We also use gas lenses on our torches with #6 cups at ~30CFH. Maybe some surface oxidation, but only the "pretty colors" ;). “


I am not sure why his instructor required lay wire technique, 140 amps, and a #6 cup at 30cfh but I would guess its because that would be fairly common for socket welds on 2 inch pipe.

30 cfh seemed a bit high even for a #6 gas lens cup…but maybe not if there is a slight breeze or draft.

I chose a #7 stubby gas lens and went a bit hotter while still using laywire and 1/8” ER70S6 wire.





Follow me on social media to see what I’m up to:
Instagram:   / weldmonger  
Facebook:   / weldingtipsandtricks  

Join the discussion with thousands of welders at the Welding Tips & Tricks forum
http://forum.weldingtipsandtricks.com