What does the word Welding mean?

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I continue to see the word "Welding" in the Trouble Shooting Check Point Section of the YAMAWA General Catalog. What does the word "Welding" mean as a problem when tapping? Can you please help me understand?

In the Check Point portion of the Trouble Shooting Section in the YAMAWA General Catalog , the term "Welding" is used to describe what happens when the workpiece material is heated to a point of melting while threading. The melted material adheres, "Welds" to the tap or Die and Solidifies. As welding develops, various
tapping problems will occur, so be careful.

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