Today we talk about a few more pipe welding tips… specifically stick welding the cover pass on a 6g 2 inch schedule 80 pipe test.
This week’s video is Part 3 of welding a 6g pipe welding test using 2 inch schedule 80 pipe coupons ordered from Triangle Engineering. (you can find their website here: trieng.com )
In the 2 previous videos, I gave some tips for the root pass and hot pass. Both root and hot pass were done with tig.
Since the root and hot pass just about filled up the joint, it would seem that it would be welded all the way with tig.
Tig all the way would be my choice for 2″ schedule 80.
But for welding certification tests, what is specified is not necessarily the best way. A 2″ schedule 80 with tig root and hot pass and stick fill and cover is engineered to qualify both processes using one test joint.
Eventually, I will do a 6g pipe test all the way out using Tig only… along with some walking the cup videos.
I used Lincoln Excalibur 7018 rods at around 90-95 amps for the cover pass on this pipe test.
Pay attention to the video where I show a different method of chucking up the rod in the stinger… as well as how I prop and collapse my hands as I reposition my body around the pipe.
This method has worked way better for me than other techniques… and I can make it all the way from bottom to top without stopping and without a big ball of metal falling in the crook of my elbow and making me stop.
It works for me. It may not work for you. But I offer it as an option… worth every penny it costs you to watch the video.
Another tip is Staggering the tie-ins on the bottom of the pipe.
It’s a good idea to stagger the tie-ins on the bottom of the pipe. Especially on heavy wall pipe joints that require several beads on the fill and cover passes.
I bought these excalibur rods specifically for the purpose of shooting a video comparing them to hobart rods. I did that video a few weeks ago.
Believe it or not, I almost never need to stick weld in the shop. I don’t even have a decent rod oven – so these rods have been left out for quite a while and are not OK for code work. 7018 rods can not be left outside an oven once opened without absorbing moisture and hydrogen. 7018 rods are low hydrogen rods. When they are left out, they are not low hydrogen, and are not OK to use for coded welds where low hydrogen rods are specified.