Ding Testing & Inspection

Type CastinType Casting Welding Procedure Qualificationg Welding Procedure Qualification

Type Testing Welding Procedure Qualification is a standardized validation of welding procedures for specific structures or products (such as pressure vessels, pipelines, steel structures, etc.), and is typically used for quality certification in mass production or for standard products. Its core purpose is to ensure the reliability and consistency of the welding process in specific application scenarios.

Read：22+ Date：2025-04-03 16:18:22 Author: DTI

Applicable Standards for Type Testing Welding Procedure Qualification

Pressure Vessels/Pipes

ASME BPVC Section IX (American Standard)
EN ISO 15614-1/-2 (European Standard)
NB/T 47014 (Chinese Standard for Pressure Equipment)

Steel Structures

AWS D1.1 (Steel Structure Welding)
EN 1090 (European Certification for Steel Structures)

Special Industries

API 1104 (Oil and Gas Pipelines)
ISO 3834 (Welding Quality System Requirements)

Core Content of Type Testing Welding Procedure Qualification

Objects of Qualification (Types of Welded Joints)

Butt Welds (Full Penetration/Partial Penetration)
Fillet Welds (Load-bearing/Non-load-bearing)
Combined Welds (Butt + Fillet Welds, such as pipe saddle welding)
Overlay Welds (Corrosion-resistant/Wear-resistant)

Qualification Elements

Element	Qualification Requirements
Base Material	Materials of the same group can be covered (e.g., P1/P2 group carbon steels)
Welding Method	SMAW, GTAW, SAW, etc., need to be qualified separately
Filler Material	Changes in wire/rod grade and specification require requalification
Welding Position	Flat (1G), Horizontal (2G), Vertical (3G), Overhead (4G)
Preheat/Interpass Temperature	Temperature range must be strictly controlled (e.g., ≥100℃)
Post-Weld Heat Treatment	PWHT (e.g., stress relief annealing)
Shielding Gas	Changes in composition (e.g., Ar → Ar + CO₂) require supplementary tests

Test Items

Destructive Testing (Typically for Initial Qualification)

Tensile Testing
Bend Testing (Face Bend/Root Bend/Side Bend)
Impact Testing (For Low-Temperature Toughness Requirements)
Hardness Testing (For Wear-resistant/Corrosion-resistant Overlay)
Metallographic Examination (Fusion Line, Porosity, Cracks)

Non-Destructive Testing (NDT)

RT (Radiographic Testing)
UT (Ultrasonic Testing)
PT/MT (Penetrant/Magnetic Particle Testing)

Type Testing Qualification Process

Develop WPS (Welding Procedure Specification)
- Determine welding method, parameters (current/voltage/speed), groove design, etc.
Welding of Test Pieces
- Prepare test plates according to standard requirements (e.g., 300×150mm butt weld plate)
Non-Destructive Testing (NDT)
- Ensure no defects exceeding standards (e.g., cracks, lack of fusion)
Mechanical Property Testing
- Sampling for tensile, bend, impact, and other tests
Report Compilation (WPQR)
- Record all parameters and test results to form the Welding Procedure Qualification Report
Certification Review (if applicable)
- Review by third-party organizations (e.g., TÜV, BV) and issuance of certification

Differences from Conventional Welding Procedure Qualification (PQR)

Comparison Item	Type Testing Qualification	Conventional PQR
Scope of Application	Specific Products (e.g., Pressure Vessel Heads)	General Welding Processes (e.g., Tube-to-Plate Welding)
Test Piece Requirements	Need to simulate actual product structure	Standard test plates (e.g., as required by ASME IX)
Test Stringency	May include additional tests (e.g., fatigue)	Only basic tests specified by standards
Certification Requirements	Usually requires third-party certification	Self-qualification by the company

Typical Application Cases

Pressure Vessel Head Seam Welding
- Need to simulate the actual product thickness and curvature for qualification
Pipeline Automatic Welding Process Certification
- As required by API 1104 for automatic welding (e.g., CRC-Evans system)
Nuclear Reactor Containment Welding
- Additional tests for radiation resistance and fracture toughness

Notes

Change Management: Any critical parameter changes (e.g., ±10% current, groove angle changes) require requalification.
Validity Period: Some industries (e.g., shipbuilding, nuclear power) require periodic requalification (e.g., every 5 years).
International Recognition: EN standards and ASME PQR may require additional supplementary tests for mutual recognition.

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One-Stop Metal Material Testing Service

Type CastinType Casting Welding Procedure Qualificationg Welding Procedure Qualification

Applicable Standards for Type Testing Welding Procedure Qualification

Pressure Vessels/Pipes

Steel Structures

Special Industries

Core Content of Type Testing Welding Procedure Qualification

Objects of Qualification (Types of Welded Joints)

Qualification Elements

Test Items

Destructive Testing (Typically for Initial Qualification)

Non-Destructive Testing (NDT)

Type Testing Qualification Process

Differences from Conventional Welding Procedure Qualification (PQR)

Typical Application Cases

Notes

Get Your Free Testing Plans and Quotation

Ask professional engineers for on-line service, and receive testing proposals within 2 hours.

Six Reasons to choose DTI

Only Four Steps to Get Your Reports

Test Enquiry

Sample Delivery

Lab Testing

Reports Issuance

After-Testing Service

Issues You May Care About

What is the difference between DTI and other third-party services?

How long will it take for DTI to issue a report?

Are the reports authoritative? Can they be used for export abroad?

What testing standards are used for the assessment?

What should I do if I have doubts about the test report provided?

What would I do if I’m not sure what items to be tested?

One-Stop Solutions Recommended

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Wind Power Industry Product Testing Solutions

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Disclaimer：

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How We Use Your Information

Disclosure of Your Information

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Choices About How We Use and Disclose Your Information

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