Learn about welder certification standards including ISO 9606, AWS, and ASME. Understand qualification requirements, testing methods, and documentation.
Introduction
Welder certification ensures that welders have demonstrated the skill to produce quality welds. At Fulei Metal, our welders hold certifications to international standards.
Why Certification Matters
Demonstrates welder competence. Required by many codes and clients. Ensures consistent quality. Provides traceability. Required for structural, pressure, and critical applications. Builds client confidence.
Major Certification Standards
ISO 9606
International standard for welder qualification. ISO 9606-1: steel. ISO 9606-2: aluminum. ISO 9606-3: copper. ISO 9606-4: nickel. ISO 9606-5: titanium. Each covers essential variables and test requirements.
AWS (American Welding Society)
AWS D1.1: structural steel. AWS D1.2: aluminum. AWS D1.6: stainless steel. AWS QC7: certified welder program.
ASME (American Society of Mechanical Engineers)
ASME Section IX: pressure vessels and piping. Most rigorous qualification. Required for pressure equipment.
EN 287
European welder qualification (superseded by ISO 9606). Still referenced in some documentation.
Essential Variables
Process
TIG, MIG, Stick, etc. Each process requires separate qualification. Change in process requires re-qualification.
Material Type
Material groups (P-numbers). Steel, stainless, aluminum, etc. Qualification covers similar materials within a group.
Thickness
Qualification range depends on test thickness. Typical: test at 3 mm covers 1.5-6 mm. Thicker tests cover wider ranges.
Position
Flat, horizontal, vertical, overhead. Each position requires separate qualification. 6G (pipe, 45 degrees) covers all positions.
Joint Type
Butt, fillet, etc. Butt qualification may cover fillet. Fillet does not cover butt.
Filler Metal
Filler classification. Similar fillers within a group.
Shielding Gas
Gas type and composition. Change may require re-qualification.
Testing Methods
Visual Inspection
Weld appearance. Bead shape and size. Surface defects. Dimensional compliance.
Bend Test
Specimen bent to specified radius. Checks ductility and fusion. No cracks or defects larger than specified. Most common test.
Radiography
X-ray of the test weld. Reveals internal defects. Porosity, lack of fusion, cracks. More expensive than bend test.
Macro Examination
Cross-section of weld. Polished and etched. Shows penetration, fusion, bead shape. Used for procedure qualification.
Certification Process
- Select standard and essential variables. 2. Prepare test coupon. 3. Weld under supervision. 4. Inspect visually. 5. Perform mechanical tests. 6. Issue certificate if passed. 7. Maintain records.
Certification Renewal
Typically valid for 3 years (ISO) or 6 months without use (AWS). Renewal requires: continued use of the process. Employer signature. No significant lapse. Re-testing if lapsed.
Documentation
Welder qualification certificate. Essential variables covered. Test results. Supervising inspector signature. Expiration date. Maintained in quality records.
At Fulei Metal
Our welders are qualified to: ISO 9606 for steel and aluminum. Client-specific requirements. Process-specific qualifications (TIG, MIG, laser). We maintain current certifications and re-qualify as needed.
Conclusion
Welder certification demonstrates competence and ensures quality. At Fulei Metal, our certified welders and documentation provide confidence that your welds meet international standards.