Welding progression uphill / downhill in Sec IX

[Konrad]

Hello,
The question is whether it's enough to qualify a PQR for both uphill and downhill when a welder makes one continous bead all around the pipe in 6G without stopping? May seem strange, but I found no clarification about it.

Konrad

 

[weldtek]

Position is a supplementary variable. If you are performing impacts, vertical up matters.

 

[weldtek]

As a secondary consideration, progression up vs. down, is an essential variable for welder qualification, so, if you're trying to get both a PQR and a WPQ with one test, review the rules for welder qualification in QW 350.

 

[GenB]

Are talking about WPQ?

 

[Konrad]

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

 

[weldtek]

Konrad,
Since you are needing a WPQ, you must test for both uphill and downhill progression. In your case, you may be covered, just be sure you have the proper number of bend coupons representing each progression.

 

[Konrad]

Weldtek,
This is exactly my concern: QW-356 lists "progression" as a variable. But QW-302.3, QW-452.1(a), nor QW-463.2(d) does not say that the opposite specimens have to be the same progression. Is there some requirement saying so?

Konrad

 

[Konrad]

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

 

[weldtek]

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'

 

[GenB]

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

 

[Konrad]

Thanks guys. I'm not just trying to do it or defend it. I'm trying to eliminate it and just was not sure. I think you're right.

Konrad