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Welding progression uphill / downhill in Sec IX
- Thread starter Konrad
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Actually in my case one WPQ=one PQR. The shop is small and only one welder makes code production, so each time I make a qualification for him, I always make procedure and performance on the same samples. I'm using GTAW and GMAW.
Say, the sample is 25mm OD tube and the welder makes three GTAW welds in G6, all round without stopping. I can make 4 samples for bending out of first of three welds. This will give one sample from top, one from bottom, one uphill and one downhill. The second and third weld will go to full section tensile testing. Is this enough to have both uphill and downhill qualified?
Konrad
Say, the sample is 25mm OD tube and the welder makes three GTAW welds in G6, all round without stopping. I can make 4 samples for bending out of first of three welds. This will give one sample from top, one from bottom, one uphill and one downhill. The second and third weld will go to full section tensile testing. Is this enough to have both uphill and downhill qualified?
Konrad
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Weldtek,
Let me explain my problem more percisely. Is there somewhere in Sec. IX written:
one uphill qualification=4 uphill specimens,
one dowhill qualification=4 downhill specimens,
one uphill+downhill qualification=4uh+4dh specimens?
Isn't it enough to have 2 uphill and 2 downhill specimens from one weld acc. to QW-463.2(d) ?
Konrad
Let me explain my problem more percisely. Is there somewhere in Sec. IX written:
one uphill qualification=4 uphill specimens,
one dowhill qualification=4 downhill specimens,
one uphill+downhill qualification=4uh+4dh specimens?
Isn't it enough to have 2 uphill and 2 downhill specimens from one weld acc. to QW-463.2(d) ?
Konrad
Konrad,
Since progression is an essential variable for welder qualification, a test assembly is required to represent each of those conditions. If it were plate and two coupons were required, you would need two coupons with uphill progression and two with downhill progression. When testing a welder on pipe, if four coupons are required, you would need four for each progression.
I'm not aware of a paragraph which spells this requirement out, but, the key is QW351 'a welder shall be requalified whenever a change is made in one or more essential variables'
Since progression is an essential variable for welder qualification, a test assembly is required to represent each of those conditions. If it were plate and two coupons were required, you would need two coupons with uphill progression and two with downhill progression. When testing a welder on pipe, if four coupons are required, you would need four for each progression.
I'm not aware of a paragraph which spells this requirement out, but, the key is QW351 'a welder shall be requalified whenever a change is made in one or more essential variables'
I woud not run PWR and WPQ on pipe, I would do separate,
Plate for PQR and pipe for WPQ, regardless of savings,
I am small too and have many procedures.
when you want to save too much, it is no good. I have lots of experiency on that.
I used top save a lot, at the end it is not worth the effort.
genb
Plate for PQR and pipe for WPQ, regardless of savings,
I am small too and have many procedures.
when you want to save too much, it is no good. I have lots of experiency on that.
I used top save a lot, at the end it is not worth the effort.
genb
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