Still Studying... question about pre-qualified processes D1.1 Clause 3
Still Studying... question about pre-qualified processes D1.1 Clause 3
(OP)
Listening to some of the advice from my last post I have been working in the code and paying special attention to the 'notes'.
Figures 3.3 - 3.4, note 'a' in the legend on page 77 provides a stipulation that these joints are not pre qualified for GMAW-S, nor GTAW.
Buuuuut sub clause 3.2.2 states that these process are never pre qualified? What am I missing?
3.2.2 CODE APPROVED PROCESSES. ESW, EGW, GTAW AND GMAW-S welding may be used provided the WPSs are qualified in conformance with clause 4. Note that the essential variable limitations in Table 4.5 for GMAW shall also apply to GMAW-S.
Thanks again in advance.
Figures 3.3 - 3.4, note 'a' in the legend on page 77 provides a stipulation that these joints are not pre qualified for GMAW-S, nor GTAW.
Buuuuut sub clause 3.2.2 states that these process are never pre qualified? What am I missing?
3.2.2 CODE APPROVED PROCESSES. ESW, EGW, GTAW AND GMAW-S welding may be used provided the WPSs are qualified in conformance with clause 4. Note that the essential variable limitations in Table 4.5 for GMAW shall also apply to GMAW-S.
Thanks again in advance.





RE: Still Studying... question about pre-qualified processes D1.1 Clause 3
RE: Still Studying... question about pre-qualified processes D1.1 Clause 3
2. It still seems contradictory....
The first paragraph of C-3.2.1 specifically excludes GMAW-S and the fourth paragraph confirms and reinforces both sub clause 3.2.2 and 4.16.1.
4th paragraph:
The code does not prohibit the use of any welding process. It also imposes no limitation on the use of any other type of joint; nor does it impose any procedural restrictions on any of the welding processes. It provides for the acceptance of such joints, welding processes, and WPSs on the basis of a successful qualification by the Contractor conducted in conformance with the requirements of the code (see Cluse 4)
The commentary goes on to explain the technical mechanics of the process.... I have welded tons of thin metal with the GMAW-S process... that's all pretty straightforward. A scientific breakdown of how things work when a guy like me "turns his SH@$ down" so the metal doesn't twist into a potato chip. :)
Thanks again for any help I am just trying to wrap my head around this book. My intention is to show up at the seminar somewhat prepared. Having no serious professionals to turn to at work, I had to come here to have anything resembling an intelligent discussion about my questions. I seriously appreciate your time. All of you.
I feel that in this crowd I can learn a lot by focusing on where my assumptions are wrong, then working on figuring out 'how and why' I am wrong. Constructive criticism is entirely welcome. Please tell me why GMAW-S is not prequalified in the text portion of clause 3, but seems to be allowed on some of the prequalified joints in the figures portion of the same clause....
RE: Still Studying... question about pre-qualified processes D1.1 Clause 3
RE: Still Studying... question about pre-qualified processes D1.1 Clause 3
Any time all the conditions for prequalification cannot be met, the WPS must be qualified in accordance with clause 4, i.e., the contractor must demonstrate the proposed WPS will produce the required properties and meet the requirements for weld soundness and visual acceptance criteria.
Specific joint details include the note "a" indicating those specific joint details are not prequalified for GMAW-S or GTAW. I believe that means those specific joint details must be qualified by testing if the contractor wishes to use them in production.
Best regards - Al
RE: Still Studying... question about pre-qualified processes D1.1 Clause 3
RE: Still Studying... question about pre-qualified processes D1.1 Clause 3
Best regards - Al
RE: Still Studying... question about pre-qualified processes D1.1 Clause 3
RE: Still Studying... question about pre-qualified processes D1.1 Clause 3