In W47.1, what does the 'WT' welding personnel classification signify?

• A. Wave testing
• B. Depositing arc spot welds
• C. Depositing tack welds
• D. Welding from one side without backing

Answer: (C)

In W47.1, the WT welding personnel classification indicates a person is qualified to deposit tack welds only. Tack welds are small, temporary welds used to hold components in proper alignment for fit-up before the final, full-strength weld is made. This classification defines the scope of work the welder is authorized to perform—limited to placing tack welds and not to performing full welds along a joint. If a job requires continuous welds, deeper or longer weld passes, or final structural welds, a different classification or additional qualification would be needed. The other options describe testing methods or different welding techniques, not the scope of personnel classification that WT represents.