i am a union pipewelder. the coupons come beveled already. you do need to set up your own purge. thats very critical! on the 41 i used a 3/32 gap with 3/32 wire for the root, at about 70 amps. i switched to 1/8 wire for hot pass and kept out of the middle!move quickly from edge to edge & be sure...

another big cause of porosity is cold starts! what i mean is striking an arc and moving forward too quickly. when u strike,you need to wait a second for arc to stabilize,then move your rod in a circular motion in place a couple times and then progress. this should prevent any chance of creating poro...

oh by the way, the ua 21 test is on sched 120,not 40!

i have certifications for ua tests # 1,14,21,22,41, & 91. i would be glad to share my knowledge

Previously TiG welder on AL and some Carbon Steel. Moved to a new location and doing stick cert before I can do TiG cert. My test is on a 2in schedule 120 pipe in a 6G position, first time I have ever seen it, saw mention in another post that someone has done it. Looking for whatever advice availab...