Answer :
Final answer:
A weld applied on the opposite side of a joint before initiating a groove weld is identified as a back weld. It's a technique used routinely to reinforce the joint and ensure the absence of frail or brittle regions post groove-welding.
Explanation:
A weld applied to the other side of a joint before a groove weld is started is called a back weld. Neither fillet weld, plug weld, spot weld, nor seam weld refers to this specific welding process. Back welding is often deployed to add strength to the joint and ensure that there won't be any weak or brittle areas after the groove weld is completed. The other types of welds listed above are correct but pertain to different welding contexts and techniques.
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