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D1.5 PQR pass variability

D1.5 PQR pass variability

D1.5 PQR pass variability

The way D1.5 is written, the assumption is that "the PQR" presents a single set of parameters, when in reality each pass in the qualfication weld can be different from the next.

How much variability do I have to accept?  A few people have said they use Table 5.3 as a guideline, but I don't have much of a legal leg to stand on rejecting someone's PQR on that basis.  Furthermore, if they're planning on qualifying based on max heat input rather than section 5.13, does that mean I should accept a 40% variation in heat input among those passes?  And if so, why should I base that on their average?  Why not on the max HI pass?


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