NASCLA Accredited Commercial General ContractorMetalsMedium
When fabricating structural steel, it is common practice to pre-qualify welding procedures. According to AWS D1.1, 'Structural Welding Code – Steel', which of the following is a primary reason for pre-qualifying a welding procedure specification (WPS) rather than requiring costly and time-consuming procedure qualification testing?
- ATo ensure compliance with local building codes, which mandate pre-qualification.
- BTo allow for the use of any welding process without restriction.
- CTo utilize established, proven welding parameters that reliably produce sound welds.
- DTo verify the welder's skill and ability to perform the weld.
Show answer & explanationAnswer & explanation
Correct answer: C. To utilize established, proven welding parameters that reliably produce sound welds.
Pre-qualified WPSs are based on extensive industry experience and testing, demonstrating that specific combinations of welding processes, materials, and parameters consistently produce welds meeting code requirements without needing additional testing for each project. This saves time and cost while ensuring quality.
Why the other options are wrong
- A. While codes require qualified procedures, pre-qualification is one method to achieve this, not a universal mandate for all procedures.
- B. Pre-qualification applies to specific, proven processes and parameters, not 'any' welding process.
- D. Pre-qualification refers to the procedure (WPS), not the welder. Welder performance qualification (WPQ) is a separate process to test the welder's skill.
Pre-qualified WPS (AWS D1.1)
A Welding Procedure Specification (WPS) that meets all the requirements of AWS D1.1 and has been demonstrated through extensive prior testing and experience to reliably produce sound welds, thus not requiring additional procedure qualification testing.
- Listed in AWS D1.1 for common processes (SMAW, GMAW, FCAW, SAW).
- Saves time and cost by eliminating procedure qualification testing.
- Requires strict adherence to specified parameters and materials.
- Does not eliminate the need for welder performance qualification (WPQ).
Memory trick: WPS Qualified: Pre-Tested, Proven, Saves Pennies.