How to Prepare a pWPS?
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Previous Blog:
http://hareeshkv.blogspot.com/2015/09/asme-bpvc-section-ix-weldingtraining.html
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We will discuss to prepare the pWPS (Proposed Welding Procedure Specification) based on the following situation:
We
have to weld a pipe to pipe joint using GTAW welding. The material of the pipe
is SA106 Gr B, 2" X Sch 40. Prepare the pWPS (Proposed Welding Procedure Specification) for the same.
As we discussed we will find out the P number of SA106 Gr B. P number is 1
(http://hareeshkv.blogspot.com/2013/05/asme-bpvc-section-ix-welding-training.html)
We will find out the suitable filler wire for Welding the said
material. From electrode manufacturers data sheet we found it as ER70S-2 and from ASME Sec IX we found that the F number is 6
(http://hareeshkv.blogspot.com/2015/04/asme-bpvc-section-ix-welding-part-2.html)
As the thickness is 3.9mm (Thickness of Sch 40 pipe), it is
decided to use 2.4mm of filler wise.
Now from the filler wire manufacturers data sheet, find the current and
voltage for using the same.
From the manufacturers data sheet the voltage required is 16-18V and the current required is 100-160A
Now we have obtained the basic data of, the material to be
welded, the filler wire to be used and the current and voltage required.
As we discussed the pWPS will be made and based on the test piece that is welded. The actuals that are happened at the time of welding and
testing are recorded and PQR will be prepared. Based on the
PQR, WPS will be made.
There will be similarity, in most of the cases, between a pWPS and
the WPS. But the WPS may also contain some other requirements(which will be in
line with essential parameters, but changes such as different joint preparation
requirements, some special instructions etc will be added as per job requirements.)
In the next blog we will start filling the pWPS format for the above case.
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