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Up Topic Welding Industry / Inspection & Qualification / Qualified weld thickness
- - By D Smith Date 02-16-2004 17:21
I have a welder with a limited thickness cert per AWS D1.1.(1/8 to 3/4) can I allow him to weld a CJP B-U4-a which cosists of a 1" base plate joined to a 3/16" thick tube, since the joint is actually only 3/16" deep? Any help would be appreciated.
Parent - By R. Johnson (**) Date 02-16-2004 21:44
If you are referring to square or rectangular tubing, then my answer would be the welder is qualified to make the joint you described.
Parent - - By bmaas1 (***) Date 02-17-2004 00:49
It depends on how the welder was qualified. Did he qualify with backing or without backing and backgouge the root, or did he weld from one side with complete burnthru or penetration. Is this tube to plate weld full pen? If he was qualified with backing or he backgouged the root then he is not qualified to weld that joint detail unless you use backing. Look at table 4.9 under groove weld type-production box tube welding qualified, cjp note 4.

Brian J. Maas
Parent - - By D Smith Date 02-17-2004 00:59
Sorry for leaving out so many details. The tube is A500-B Square tubing. The welder is qualified to do CJP groove welds with backing. The joint of course is with backing and CJP also. Thank you for your responses.
Parent - - By bmaas1 (***) Date 02-17-2004 01:31
Since the base plate is 1" and the welder is qualified up to 3/4" then I don't think so. If was just a straight fillet or a pjp weld then you would be ok.
Mayby somebody else would have an opinion on this.

Brian J. Maas
Parent - - By thcqci (***) Date 02-17-2004 12:56
I don't completely understand the joint you are referencing. It would seem to me that a B-U4a is a butt joint, but what you describe sounds more like a TC-U4a.

AWS D1.1 says" Effective size of CJP Groove Welds. The weld size of a CJP groove weld shall be the thickness of the thinner part joined. ..."

Welder qualified by my book if weld size is the only question.
Parent - By CHGuilford (****) Date 02-17-2004 14:08
I tend to agree that TC-U4a is probably what the joint should be from what is describes. The joint thickness is 3/16" so the 3/4" thickness limitation for the welder does not apply.

Parent - - By D Smith Date 02-17-2004 14:19
Yes you are correct. The joint is TC-U4-a. Using Table 4.10 and figure 4.30 or 4.31 I would say he is certified to perform the weld.
Parent - By SPCDOMTT Date 02-20-2004 19:08
I have a similar question. If I run a PQR for a fillet welding procedure per section 5.12 of the A.W.S D1.5-95 code on a 3/4" test plate I am limited to 1 1/2" thickness. Is that a max of 1 1/2" weld thickness or the material being welded cannot be over 1 1/2" thick?
Up Topic Welding Industry / Inspection & Qualification / Qualified weld thickness

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