Who may perform the mechanical testing of qualification specimens?

• A. Any accredited testing organization (ATO), or a W178.1-certified welding inspection organization, or other labs acceptable to CWB
• B. Only the CWB
• C. The employer's internal lab
• D. The welder

Answer: (A)

Testing of qualification specimens must be done by an independent, qualified laboratory to ensure objective, consistent results that meet the standard’s requirements. The allowed performers are accredited testing organizations (ATO), or welding inspection organizations certified to W178.1, or other laboratories that CWB has deemed acceptable. This setup guarantees proper calibration, standardized test methods, and qualified personnel, and it protects the integrity of the qualification process by avoiding potential conflicts of interest.

The employer’s internal lab is not considered acceptable because it may lack the third‑party verification and impartiality required for certification. A welder cannot perform these tests because the process demands controlled laboratory conditions and calibrated equipment with independent oversight. While CWB oversees certification, the actual mechanical testing is carried out by these approved laboratories, not by CWB itself.