What is tacking in welding?

• A. A method to grind welds.
• B. A technique to keep parts held in place.
• C. A final finishing step.
• D. A process to apply flux.

Answer: (B)

Tacking in welding is about quickly holding parts in the correct position so they stay aligned during the welding process. Tiny, short welds—placed at strategic points like corners or along joints—lock the pieces together before you lay down the full welds. This keeps the fit-up accurate and helps prevent movement or distortion when the heat of welding is applied to the rest of the joints. Because these tacks are small and low in heat input, they minimize warping and make it easier to check the fit before committing to a complete weld sequence. Once the final welds are done and the part has cooled, the tack welds can be left as is if allowable, or removed by grinding if the finish requires it. This isn’t about grinding welds, finishing welds, or applying flux; it’s about using small welds to hold everything in place during fabrication.