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_21.html
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Please see the format in the previous blog for number references.
We will go in detail in
Table QW-451.1;
Please read the column
headings.
1.
Thickness T of test coupon
welded in (mm).
Here in this column the
thickness of our welded coupon to be located. Please note that the values in
the column are in inch if it is not of brackets and the values in brackets are
in millimeter.
a.
If the welded coupon is
less than 1/16 (1.5) the data in the first row to be selected for further
details.
b.
If the thickness of the
welded coupon is between 1/16 to 3/8 (1.5 to 10), incl; the data in the second
row to be selected. In this please note the end value that is 1.5mm, it is
included in the second row. It is mentioned that 10mm is included in this row.
c.
Similarly proceed to
further rows as required.
2.
Range of thickness T of
base Metal, Qualified, in (mm):
a.
For every thickness of
the coupon welded there is a minimum and maximum thickness qualified or there
is a range qualified for the WPS and that can be noted from these columns under
this heading.
b. The thickness of the coupon in our case is
3.91mm; according to the data in the second row, the minimum base metal
qualified is 1.5mm and the maximum is 2T. T in our case is 3.91mm so 2T becomes
7.82mm. So our WPS range qualified will be between 1.5mm to 7.82mm. In other words,
the PQR we make by welding on a coupon of 3.91mm can be used for making a WPS
using which 1.5mm to 7.82mm can be welded.
Will continue in the next blog...
Disclaimer: Photos are taken from different websites. If this violates any copyright rules this will be removed. Please inform me if any of the photos or contents violates copyright rules. (through 13hareesh13@gmail.com). This blog is meant for educational purpose only. If it is used for any other means without the written consent from the author, the author will not be responsible. Author does not guarantee the accuracy of data used in this blog.All the information, data, photo/image, calculations presented in this blog should be used at the sole risk of the user. The blogger is not liable or responsible in any way for any damage, losses or costs arising from use of the blog for any purpose whatsoever or whosoever it may be. The blog is to be used at your sole risk and responsibility.
Disclaimer: Photos are taken from different websites. If this violates any copyright rules this will be removed. Please inform me if any of the photos or contents violates copyright rules. (through 13hareesh13@gmail.com). This blog is meant for educational purpose only. If it is used for any other means without the written consent from the author, the author will not be responsible. Author does not guarantee the accuracy of data used in this blog.All the information, data, photo/image, calculations presented in this blog should be used at the sole risk of the user. The blogger is not liable or responsible in any way for any damage, losses or costs arising from use of the blog for any purpose whatsoever or whosoever it may be. The blog is to be used at your sole risk and responsibility.
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