Hoobassar is a pipe welding GOD. He even wrote the book on it! :-) He has cool '70's hair & sideburns in the book too. :-) I've heard if you can do an open root with 7018, you can do just about anything. I never have, or tried, so I guess that means I can't. Cool. :-) S.W.
"Well, what the hell do you think an elephant gun's for?...Killing elephants.......Run for your life, pal. (Brad Wallace to an enormously overweight hunter he is about to shoot, Blue Twilight)
I've had good luck with just going 10 amps lower than what I would normally weld with with a 7018. Everything else stays the same, same size rod, just a little lower on the amps. Don't know if this would help you or not.
Charles Welch
Yeah, I definately had to turn it down. I also think I had problems with slag getting trapped in the key hole at the stops. I still passed x-ray though.
well done on the test rik, 7016 rods are a more common rod here where i live,and are what i am more comfortable with on open root. a job has cropped up which requires 7018 and i as a novice with them found the thicker flux is the biggest drawback.this is 7018 root and cap carefully edited he he.
Hows it goin I was just wondering what type of weave you are using. Those look great.
elliott
What size rod did you run on that root pass, what size on the fill and cap, and what sch. pipe.
By Mark Tyree
Date 07-10-2008 19:43
Edited 07-10-2008 19:46
when you first get going... do you key hole it, or no? What motions did you use when you put in the root? did you step it? i have to do it on 6 inch pipe 3/4 thick, with a 1/8 inch land and 1/8 inch gap. he never mentioned up or downhill. its a 6g test.... 1/8 inch 7018 from root to cap. do you have any other advice you can give me on putting a slick root pass in? thanks, Mark.
I did these in the past but only with 3/32" . The fitup varied around the window (tangent tube window welds) and we had to use a remote amperage control to compensate. The arc was kept as short as possible pointing back towards the puddle. The remote came in handy when the keyhole started to grow.
One other thing, for ASME qualification on an open root with 7018 does NOT qualifiy for an open root with 6010. It does qualify for welding with backing for the lower f-numbers.
Table QW-433 contains the info.
