Welder qualification for 5/8 OD. x .156 thickness and larger

Date 11-30-2011 21:20

I would like to qualified welder for 5/8 OD. x .156 thickness and larger, so the can qualify to weld any thing smaller 2.78;
as it right now our welder are qualified from 2.875 OD. or larger . and no limit on groove weld because they test on .5 plate. Please give me suggestion how to do it to meet Section 9 and B31.3, PED etc.

Thanks,
V-Dao

By ozniek

Date 12-01-2011 13:41

Hi vdao

I will answer the question from an ASME IX perspective. (Includes B31.3) A test piece of less than 1" OD qualifies from the diameter tested and up, so to weld 5/8" OD, the test piece needs to be 5/8" OD or smaller. The thickness qualified will be double the wall thickness, so to qualify 0.156" thickness, the test piece needs to be at least 0.078". (Although I would recommend going for as thick a pipe as you can get in that size.)

Regards
Niekie

By vdao3004 (**)

Date 12-01-2011 18:07 Edited 12-01-2011 20:20

ozniek,
Your are my best advisor.
Thanks.

By 464238

Date 12-02-2011 22:12 Edited 12-02-2011 22:17

You will also have to use more than one coupon as per ASME Section IX; QW302.2 for Volumetric NDE the minimum length of coupons to be examined shall be 6" in length or multiple coupons may have to be used.

For the Diameter restrictions you can find it in ASME Section IX QW452.3 (already answered by Ozniek)