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:
http://hareeshkv.blogspot.com/2015/10/asme-bpvc-section-ix-weldingtraining_20.html
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Please see the format in the previous blog for number references.
(10) Joint design. Here in CASE 1, it is butt weld.
The basic joint configurations are designated as Butt Joint, Tee Joint, Corner Joint, Lap Joint and Edge Joint.
There are many design variations in the basic joint configurations. For example, in the Butt Joint configuration there are square butt joint, Single 'V' & Double 'V' butt joint, Single Bevel & Double bevel, Single 'J' and Double 'J' and Single 'U' & Double 'U'. Similarly there are variations in Tee, corner, lap and edge joints.
(11) Details. In this area we can draw the weld configuration and can write other special requirements in joint design and other details.
In CASE 1, we can draw a Butt weld with a single 'V' configuration.
(12) Root Spacing: Root spacing here in CASE 1 is, 2.4mm, as we decided to use 2.4mm filler wire for root welding.
(13) & (14) Backing. This means that, is root is free standing or made on the top of anything like backing strip, back chip welding etc.
In case one it is free standing and we will mark it on (14)
(15) Backing Material type: As explained the backing can be backing strip, back chip welding, base metal etc.
In Case 1 this will be NA (Not Applicable)
(16) We have to tick the type of backing material, In CASE 1, as this is not applicable, there is no need to tick anything.
(17) This need not be written in the actual case of a WPS or pWPS. Here it is written for explanation purpose only.
The series will continue...
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