PQR (Procedure Qualification Record) is important because it proves that a welding procedure can produce strong and reliable welds.
It provides actual test results showing the weld meets required standards and quality.
PQR ensures safety, consistency, and compliance in critical welding work.
In this article:
Why is PQR important?
PQR (Procedure Qualification Record) is one of the most critical documents in welding because it proves that a welding procedure can produce strong, defect-free joints.
Let’s go into it in detail.
1. What is PQR?
Definition
A PQR (Procedure Qualification Record) is a document that records the actual welding test results, showing that a specific welding procedure is capable of producing acceptable weld quality.
👉 It is practical proof, not just theory.
2. Why is PQR Important?
(A) Validates the Welding Procedure
- Confirms that the procedure used in WPS (Welding Procedure Specification) actually works
- Ensures welds meet required strength and quality
👉 Without PQR, WPS is just a guideline—not proven
(B) Ensures Weld Quality
PQR includes results of tests like:
- Tensile test
- Bend test
- Impact test
👉 These tests prove:
- Strength
- Ductility
- Toughness
(C) Required for Industrial Standards
PQR is mandatory in major codes like:
- American Welding Society (AWS)
- American Society of Mechanical Engineers (ASME)
- International Organization for Standardization (ISO)
👉 Industries will not accept welding work without PQR
(D) Helps Create WPS
- PQR is done first
- WPS is prepared based on PQR results
👉 So, PQR is the foundation of WPS
(E) Improves Safety
- Ensures welds can withstand:
- Pressure
- Load
- Temperature
👉 Prevents failures in:
- Pipelines
- Boilers
- Pressure vessels
(F) Reduces Failures and Costs
- Detects problems during testing stage
- Avoids costly repairs later
👉 Saves:
- Time
- Money
- Materials
(G) Records Actual Parameters
PQR documents real values like:
- Current
- Voltage
- Travel speed
- Filler material
👉 Helps maintain consistency in production
3. Role of PQR in Welding Process
Workflow:
- Perform test weld
- Record results → PQR
- Prepare procedure → WPS
- Use WPS in production
4. Key Benefits Summary
| Importance | Explanation |
|---|---|
| Validation | Proves welding procedure works |
| Quality | Ensures strong welds |
| Safety | Prevents failures |
| Standard compliance | Required by codes |
| Cost saving | Avoids rework |
| Consistency | Maintains uniform welding |
5. Conclusion:
- PQR = Proof of welding quality
- WPS = Instructions for welding
6. Summary
- PQR is a record of tested welding procedure
- It validates WPS
- Includes mechanical test results
- Required by AWS, ASME, ISO standards
- Ensures quality, safety, and reliability
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