When are certified welders required to carry their licenses according to regulations?

Certified welders are required to carry their licenses while on the job because this practice ensures compliance with safety regulations and verifies the welder's qualifications. Having the certification readily available allows employers and inspectors to confirm that the welder is authorized and skilled to perform welding tasks according to established standards. Carrying the license not only contributes to workplace safety by ensuring that only qualified individuals are conducting critical welding operations but also promotes accountability in the industry. This requirement is crucial for maintaining quality control and adhering to the standards set forth by welding codes, such as the Los Angeles City Structural Welding Code – Steel (D1.1). Other contexts, such as during training or at certification exams, do not demand that the welder carries their license, and having it at home is not practical for job-related verification.