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Q: In case of welded connection in steel structures, during welding, a defect is caused by coating of the parent metal with a foreign matter and because the groove is not kept clean This defect is known as
  • A. lack of fusion
  • B. overlap
  • C. incomplete penetration
  • D. slag inclusion
Correct Answer: Option A - Lack of fusion–Result from foreign debris coating the parent metal and from improper cleaning of the groove. Lack of fusion is the failure of the base metal to get completely fused with the weld metal. It is caused by rapid welding and also because of the presence of foreign materials on the surface to the welded.
A. Lack of fusion–Result from foreign debris coating the parent metal and from improper cleaning of the groove. Lack of fusion is the failure of the base metal to get completely fused with the weld metal. It is caused by rapid welding and also because of the presence of foreign materials on the surface to the welded.

Explanations:

Lack of fusion–Result from foreign debris coating the parent metal and from improper cleaning of the groove. Lack of fusion is the failure of the base metal to get completely fused with the weld metal. It is caused by rapid welding and also because of the presence of foreign materials on the surface to the welded.