WPS (Welding Procedure Specification) comes first as a planned set of welding instructions.
Then PQR (Procedure Qualification Record) is created by testing and validating that the WPS works properly.
So, WPS is prepared first, and PQR proves its effectiveness.
In this article:
Which comes first, WPS or PQR?
PQR comes first, then WPS
- PQR (Procedure Qualification Record) → comes first
- WPS (Welding Procedure Specification) → comes after
1. Why does PQR come first?
Because:
👉 You must prove that a welding procedure works before writing instructions for it
- PQR provides actual test results
- WPS is prepared based on those results
2. Step-by-Step Process
Step 1: Perform Test Welding
- Weld a sample using selected parameters
- Example:
- Current
- Voltage
- Electrode type
Step 2: Record Results → PQR
- Record actual values used
- Perform tests:
- Tensile test
- Bend test
- Impact test
👉 This becomes the PQR document
Step 3: Prepare WPS
- Use successful PQR results
- Write instructions for production welding
👉 This becomes the WPS
4. Relationship Between PQR and WPS
| Feature | PQR | WPS |
|---|---|---|
| Comes first? | ✅ Yes | ❌ No |
| Type | Test record | Instruction document |
| Purpose | Proof | Guidance |
| Basis | Practical testing | Based on PQR |
5. Importance of This Order
Ensures Quality
- WPS is based on tested and proven method
Ensures Safety
- Prevents weld failure in:
- Pipelines
- Pressure vessels
Required by Standards
This sequence is required by organizations like:
- American Welding Society (AWS)
- American Society of Mechanical Engineers (ASME)
- International Organization for Standardization (ISO)
6. Conclusion
- PQR = Proof first
- WPS = Procedure later
7. Summary
- PQR is done first (testing and proof)
- WPS is prepared next (instructions)
- PQR validates WPS
- This order ensures quality, safety, and standard compliance
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