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Arc Welding 101: Those dang CVN requirements

By Paul Cameron
November 21, 2014
Article
Arc Welding

Q: Table 4.6 of AWS D1.1: 2010 is a list of supplementary essential variable changes that would require weld procedure specification (WPS) requalification due to Charpy V-notch (CVN) testing requirements. Under base metal (item 2) it indicates:

Minimum thickness qualified is T or 5/8 inch whichever is less except if T is less than 1/4 inch, then the minimum thickness qualified is 1/8 inch.

I take this to mean that to qualify a partial joint penetration (PJP) groove weld of a 3/16-in. plate, a weld procedure would have to be qualified using 3/16-in.-thick material. Do you agree?

Wes O.

A: Oh, those dang CVN requirements.

I am currently working with two clients on this very issue. Your assessment of the CVN Supplement is correct. We advised them to machine the test plates to 0.230 in. to ensure we were under 6 mm to eliminate any code question). We completed procedure qualification requirements on 0.230-in., 0.3125-in., and 1.0-in. material, and that covered our range.

Here are a couple of other things that can come back to bite you with CVN requirements:

Multipass Versus Single Pass (see Table 4.6.11). Most PQRs are typically multipass. These multipass PQRs would not qualify single-pass welding.

Maximum Interpass Temperature (see Table 4.6.7). If interpass temperatures were measured under 125 degrees F, the maximum qualified interpass temperature qualified would be under 225 degrees F. This would limit Preheat Category A and C steels to 1.5 in. maximum and Category B steels to 2.5 in. maximum.