What is the difference between,,?

Question

the WPS and PQR in the welding process design?

Answer 1

From http://www.inspecttest.com/welding-engin...

"What is Welding Procedure Specification (WPS)?

A WPS is a document that describes how welding is to be carried out in production.  Its purpose is to aid the planning and quality control of the welding operation. They are recommended for all welding operations and most application codes and standards make them mandatory.



What is Procedure Qualification Record (PQR)?

A PQR is required when it is necessary to demonstrate that your company has the ability to produce welds possessing the correct mechanical and metallurgical properties.

A welding procedure must be qualified in accordance with the requirements of an appropriate welding procedure standard, such as ASME Sec IX, as follows:

Produce a welding procedure specification (WPS) as stated above.

Weld a test piece in accordance with the requirements of your specification. The joint set up, welding and visual examination of the completed weld should be witnessed by a certified welding inspector such as an AWS certified CWI or an Inspection Body. The details of the test such as the welding current, pre-heat etc., must be recorded during the test.

Once the welding is complete the test piece must be subject to destructive and non destructive examination such as radiography and mechanical tests as defined by the welding procedure standard. This work must be carried out in a qualified laboratory but the Inspection Body may require witnessing the tests and viewing any radiographs.

If the test is successful you or the test body completes the appropriate documents which the test body’s surveyor signs and endorses. ..."