PQR & WPS

By hogan

Date 08-18-2008 17:22

need more info. what code, material, and thickness

By exwelder1@yahoo Date 08-18-2008 20:01

ASME Section IX, A106 Grade B, Thickest material onsite is 0.322 wall. Actually the 2" test should cover the entire project because the were are using 2" pipe thru 8" pipe. All the same grade. and the thickness should not be an issue either. the 2" test would cover the 2" to be welded in the field. If am mistaken feel free to enlighten me.

By 3.1 Inspector Date 08-18-2008 18:33 Edited 08-18-2008 21:10

Just to add to hogan's reply....
The diameter of the test specimen is also important in regards to welders qualification.

By Kix

Date 08-18-2008 19:54

The answer is yes, but it depends on the code your working to and what test the PQR was done on.

By 3.1 Inspector Date 08-18-2008 19:57

Then how can the answer be yes?

By Kix

Date 08-19-2008 12:32 Edited 08-19-2008 12:38

To answer your question 3.1inspector, the thread starter asked "will one PQR qualifying a procedure support (1) a wps for 6" pipe and above and (2) 2" pipe and above". The answer is yes if he is using say ASME and if he did the test with the right Sched 2" test coupon. Hope that helps ya out.

By 3.1 Inspector Date 08-19-2008 12:35

just joking with you.

By exwelder1@yahoo Date 08-18-2008 20:02

The PQR was done on a two inch coupon

By Shane Feder (****)

Date 08-18-2008 20:57

3.1 Inspector,
The diameter of the PQR test coupon is totally irrelevant. The thickness is the only thing of concern.
A plate coupon can be used for WPS qualification and is acceptable for all pipe sizes and vice versa.
exwelder1,
If the PQR was done on Sch 80 2" pipe (5.54 mm WT) it can be used on pipe and plate up to 11.08 mm WT. (Sorry, I come from a metric part of the world)
Hope that helps,
Regards,
Shane

By 3.1 Inspector Date 08-18-2008 21:06

Shane...
Ye, I know. I was reffering to the welders qual.
Guess I did not make it as clear as I could have......
If he weld on a 6 inch pipe, he will not be qualified for a 2 inch....If I remember correct.

3.1

By Kix

Date 08-19-2008 12:37

He only asked if the WPS for the PQR qualification could be used for welder quals. He could if the welder qual test was the same as the test that he did to qualify the PQR.

By 3.1 Inspector Date 08-19-2008 12:44

I know.
I understood it as he would either do a 2 inch or a 6 inch test, and that test should also be used to qualify welders in both 2 and 6 inch dia.

By Kix

Date 08-19-2008 12:41

A 2" what Schedule? What code are you working to?

By pipewelder_1999 (****)

Date 08-20-2008 03:42 Edited 08-20-2008 03:44

Yes.

One PQR can be tested for a WPS for both pipe diameters. Diameter is a non-essential variable for ASME Sec IX.

Therefore ONE plate or pipe could be used and a WPS written for diameters from 1/4" to 200" if you like.

Just because the code allows it doesn't make it practical.

The wps can be used for whatever range is allowed. There is no difference for welder quals or production.

If the welder who welded the PQR used plate, then that welder will be allowed to use the WPS that goes down to 1/4" however he will only be allowed to work within his range of qualification gained from welding the PQR (2-7/8" min) , he will not be qualified to "USE THE WPS" for the entire range allowed by the WPS. [edit]Since the welder used a 2" coupon then his min diameter would be 1" OD. The procedure could be written for less, he just couldn't weld the joint if it were less than the 1" min. [/edit]

Don't mix performance an procedure qualifications. There is absolutely no relationship.

Have a nice day

Gerald Austin
www.weldingdata.com

By motgar

Date 10-29-2008 14:50

Gerald,

Can someone then use a .25" thick GTAW ASME PQR on plate, to write a WPS for 2" schedule 80 pipe. Stainless for both, PQR and WPS, SA-240 Type 304. No other essential variable changes.

I am just wondering due to QW-463.1(d) and QW-463.1(e); procedure qualification.

I guess my point is this. If plate can qualify the procedure for pipe, then why are the above mentioned in the ASME Section IX?

By pipewelder_1999 (****)

Date 10-29-2008 16:52

If diameter is not a variable and product form is not a variable then it is clear that pipe or plate is not an issue provided all other variables are within range.

In relationship to why the figures exist, If those were not mentioned and one decided to qualifiy a procedure on pipe , they would need to know where to remove the specimens from.

Thats my opinion. In addition pipe diameter is an essential variable for flash welding.