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Up Topic Welding Industry / General Welding Discussion / What a test.
- - By Tnwelder (**) Date 02-06-2008 20:53 Edited 02-06-2008 20:55
I called this company and asked what the procedure is to get a job. I was expecting a 6" pipe test with either tig or 7018 root, but he told me that the procedure had changed.  The test is 3 2 1/2" pipes all heavy wall in the 6G position with tig out with one, 7018 out on the other, and tig root and 7018 out on the other. Im thinking that is a hard test.  Just was wondering what you all thought about this. O yea that is all 1/8 rods, gap, and land.
Parent - - By ZCat (***) Date 02-07-2008 01:20
thirty two half inch pipes is a lot :)
Parent - By Leo27 (*) Date 02-07-2008 01:51
wow thats a test 30  ,34, 36,inch pipe not a 32half  wow i am a smarta** why yes why yes i am  thank you very much
Parent - - By Tnwelder (**) Date 02-07-2008 02:50
No its 3 separate pipes that are 2 1/2" thick. I still think that this is hard.
Parent - - By welder5354 (**) Date 02-07-2008 03:12
Easy test, a lot of company's are doing that test those days.
It gives the welder more flexibility regading welding  for the company.
Parent - - By Tnwelder (**) Date 02-07-2008 03:21
have you ever taken that test. If so can you give some advice of the for that 2 1/2" pipe. I have never welded on it.
Parent - - By Kix (****) Date 02-07-2008 13:27
You said 2.5" thick? Do you mean outside dia?  Tig roots aren't going to be 1/8" land.  1/8" rod and an 1/8" gap with a knife edge land for a tig root is about as good as it gets.  Your 7018 root might be tricky if you've never done it. I wouldn't go with an 1/8" land for your 7018 either, more like a 3/32" land.  Usually the test is a 2" sched 160 pipe.
Parent - - By welder53 (*) Date 02-07-2008 19:06
Yes, i have done a few of those test.
The test I assume is on 2-1/2" , sch. XXH (wall thk. is 0.625").
If you weld the test piece then you are qualified to weld pipe 1" O.D. and up.
Lets deal with 7018 first.  The gap should be 3mm and the land should be 2.5mm.
(there's a post that i put in the forum last year that will explain how to weld
7018 all the way.>>Just do a search.
Welding 7018 will qualify a welder (on open butt joints) to weld 1" O.D. and up + unlimited, under ASME Section IX code.
Welding F6F4, will require first pass tig (depending on procedure) and remainder F4.  This will allow a welder
to weld on process piping 1" O.D. and up.  F6 qualified up to 0.188 thk and remainder using F4 (still unlimited).
Parent - By Hoeky (*) Date 02-07-2008 19:32
on the low hydrogen root. I would use a 3/32 rod for the root. a 1/8 gap, and 3/32 land myself.  The key here is to not touch the material with the rod or you will trap flux.  Guaranteed.  when you feather out your stops  make sure you get deep evough to get all the black flux out that will be hangin in there. Hence the 1/8 gap,  you can push a disk in there no problem.  when you tie in, make sure you go slow enough to get full fusion at the tie in. I  usually start a little bit before the feather edge of the last weld in order to get a good puddle going when you drop into the keyhole.  If its done right it will look like a tig root. Or nicer.
Parent - - By Tnwelder (**) Date 02-07-2008 19:32
Kik when i called he told me that the land and opening would be an 1/8.  I thought that was a little odd for a size pipe like 2 1/2" would be that way.  But he said it would be.  I just put wat he told me. Thanks for the post.
Parent - By Hoeky (*) Date 02-07-2008 19:34
Root gap and land are always welders choice. thats the way it is. do it your way. or ask for a demonstration.  then well see who the welder is!
Parent - - By Kix (****) Date 02-07-2008 19:37
He must have half ass told you what everything would be.  1/8" land for a tig root is plain dumb.  No reason to hold your welder to that.
Parent - By Hoeky (*) Date 02-07-2008 19:40
the only time I use a 1/8 land on a tig root is with a J-groove  on some super heavy wall.  but its not unheard of.
Parent - - By welderdude (**) Date 02-08-2008 02:02
sometimes they have office types answering the phones and they get the details that the shop guys give them mixed up. 

1/8" land and opening is pretty much standard for a stick test on any size pipe.  on tig the gap is pretty much welder's preference.  I've heard of anything between 3/32-5/32" gap.  but everybody agrees that there shouldn't be any land on tig. 

you might go in to test and the guy you talked to won't be the one giving you the test...it'll be the foreman or supervisor of some sort.
Parent - - By welder5354 (**) Date 02-08-2008 04:48
See attachment for F3F4 set-up. 2" sch. 160.
Attachment: F3F4.pdf (103k)
Parent - - By welderdude (**) Date 02-08-2008 10:35
nice description!  I like how it even says where to run the passes and with what rod.  I've seen a lot of WPS's that don't get into that much detail.
Parent - By welder53 (*) Date 02-08-2008 13:38
Welderdude, I've taken all my WPS's from what the inspector has
given me and put them in that format, which makes it easier for the welders
who are testing to understand.
dh
Up Topic Welding Industry / General Welding Discussion / What a test.

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