WPS for backwelding

[sadra]

hi
We have WPS for single side bevel.if we wanted to do back welding we have to have another WPS or not?.I beleive that K
bevel or X bevel has different meaning with backwelding.
If my idea is not correct pls. advise me.

 

[pipewelder1999]

If you are using a WPS/PQR that is in accordance with ASME Sec IX. The joint design is a "Non-essential" variable. Also, single side welded joints on a PQR qualify for double welded joints.

Have a nice day
Gerald Austin
Iuka, Mississippi

http://www.weldinginspectionsvcs.com

 

[pipewelder1999]

From asme Sec IX

"QW-212 Type and Dimensions of Groove Welds Except as otherwise provided in QW-250, the type and dimensions of the welding groove are not essential variables."

Gerald Austin
Iuka, Mississippi

http://www.weldinginspectionsvcs.com

 

[sadra]

hi;
let me explain that we have one wps for single bevel.now
because of some reason we wanted to do backwelding but client request new wps .our code is aws D1.1 not asme sec. IX
regards,
reza salimi

 

[pipewelder1999]

If you have a WPS prepared in accordance with AWS D1.1 and change the joint design to a joint design that is a "Prequalifiied" joint . NO requilification is needed provided all essential variables remain the same.

Table 4.5 in D1.1 98, Page 115, Item 32.

If your double vee joint does not meet the requirements of one of the prequalified joint details in section 3 of D1.1. You do have to requalify the welding procedure.

Have aa nice day.
Gerald Austin
Iuka, Mississippi

http://www.weldinginspectionsvcs.com

 

[sayee1]

Sadra,
The omission but not addition of backing or backgouging is an essential variable as per point 35, table 4.5. So if you are not changing groove design but only employing backwelding in a single Vee for eg, when the PQR is qualified single Vee single sided welding, no requalification is required.
Gerald
I have faced a lot of problems in convincing clients on your point. I agree that a change in groove type is essential only if joint detail does not meet the requirements of one of the prequalified joint details in section 3 of D1.1. In addition for a given joint design, the tolerances for root, face and groove angle should meet the tolerances spelt out in 3.12,3.13, 3.13.4,5.22.4.1 and 5.22.4.2. Thanks and regards
Sayee Prasad R
Ph: 0097143968906
Mob: 00971507682668

 

[pipewelder1999]

The point is if you use ANY prequalified joint, you don''t have to do a PQR. (Provided all of the other variables fall within the range for prequaiification)

I didn't pay close enough attention to your original question. IF you change the joint design or some other variable from the original WPS, you do need another WPS. If your original WPS listed multiple joints such as B-U2a AND B-U2 then that WPS would be acceptable. However if your WPS only listed one joint and you wanted to use another, you wwold either need to write another or ammend the existing.

Have a nice day. I may not be fully understanding you problem.
Gerald Austin
Iuka, Mississippi

http://www.weldinginspectionsvcs.com

 

[sadra]

hi
my problem is we have one wps for single v bevel without any backwelding mention in that. now if i wanted to do backwelding on the joint another wps is require or not?
I hope I could transfer my problem.
thanks,
Reza Salimi
r_salimi@boushehr.sadragroup.com

 

[pipewelder1999]

You would need another WPS or a revision to the current WPS to indicated backwelding or refernce to a joint that is backwelded.
Gerald Austin
Iuka, Mississippi

http://www.weldinginspectionsvcs.com

 

[pandithan]

HI
CAREFULL WITH WELDER QUALIFICATION BECAUSE IT IS ESSETIAL VARABLE