How to Prepare a pWPS?
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Example situation for filling pWPS. CASE 1
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.
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Previous Blog:
https://hareeshkv.blogspot.com/2018/07/asme-bpvc-section-ix-weldingtraining.html
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Please see the format in the previous blog for number references.
(26)
Thickness range:
Base
metal: Groove…..
Here
we have again go back to ASME BPVC Sec IX for having the idea of ranges a WPS
qualifies.
As
discussed previously we are discussing about WPS so we have to refer Article
II. Refer Table QW-256; QW-403; Base materials.
In
the table, “T qualified” is in QW-403.8
Refer
QW-403.8 in Article 4;
“A
change in base metal thickness beyond the range qualified in QW-451, except as
otherwise…..”
Refer
QW-451; Procedure Qualification thickness limits and test specimens.
Our
pipe is 2” Sch 40 thkickness is 3.91mm
Refer
the table headings; ‘T’ for base material thickness; ‘t’ for weld metal thickness.
Range of metal qualified as per the table (Refer the data above the red line)
Min. base metal qualified: 1.5mm
Max base metal qualified (2T): 7.82mm
Deposited weld metal thickness is 2t: 7.82mm
't' - is 3.91 that is the entire thickness is welded with one process; GTAW.
Will continue in next blog....
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