[Coldman]

I'm gonna be working up a PQR/WPS for staino pipe soon. Masking tape on the ends for purging takes time. I found that 2-1/2" OD copper tube (18#) slides over 2" pipe neat so I decided to make up some purge caps. (2" s/s sched 160 pipe will be my test coupons). Sliced some rings and flattened out some copper tube to make the caps. Decided to fuse them together with tig. Tried straight arc, bit like pelican poop. Tried pulse, bingo. Squeezed in the vice to remove gaps.

Settings:
DCEN
sharp 3/32" lanth, No.6 cup
10l/min argon
145amps on the pedal
2.5 pps
50% on time
50% background current

I mashed the pedal when cold to puddle then dropped back to a consistent 106 amps for the run.

Cap1.jpg (142.15 KiB) Viewed 903 times

Cap2.jpg (104.83 KiB) Viewed 903 times

cap3.jpg (89.75 KiB) Viewed 903 times

cap4.jpg (133.13 KiB) Viewed 903 times

[LtBadd]

Good deal, way to get it done!

[jroark]

Very good! Thanks for sharing. I’ve never welded copper. Nice results.

[rahtreelimbs]

I tried my hand at welding copper a few years ago. About the same as carbon steel. I used copper romex wire as filler rod.