Welding Procedure Specification (WPS)

A Welding Procedure Specification’s (WPS) are documents based on a particular welding process generally during fabrication. Each one is created based on the situation and must be made by a certified welding inspector.

They are important for quality assurance and legal purpose. A WPS ensures that welders know exactly how to weld leading to better quality and less faults.

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Welding Procedure Specification Procedure

1. Step 1: Write a draft WPS

2. Step 2: Do a sample weld using draft WPS. This is called PQR (This needs to be witnessed by inspector)

3. Step 3: Send the sample to NATA lab for testing

4. Step 4. If test passes, write the Final WPS

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