Which condition would necessitate the requalification of a welder for arc spot welding?

Requalifying a welder for arc spot welding may be necessary under various conditions to ensure continued competency and safety in the welding practices.

The first condition—no previous qualifications—means that if a welder has never been certified or qualified in arc spot welding, they will need to go through the qualification process to establish their skills and understanding of the welding techniques.

The second condition refers to the time elapsed since the last certification. Many welding standards specify that a welder’s qualifications are only valid for a certain period. If a welder has not been active or has not performed welds within that timeframe, they are required to requalify to ensure they still meet the required skill level and safety standards.

Lastly, a change in welding equipment can also necessitate requalification. Different equipment can affect the welding process, parameters, and overall quality of the welds made. This means that even an experienced welder may need to demonstrate their skills on new equipment to ensure that they can work safely and effectively with it.

Given that each of these scenarios presents a valid reason for the requalification of a welder, the correct answer encompasses all these conditions, highlighting the importance of maintaining current qualifications to uphold safety and workmanship standards in welding processes.