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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–In weld, incompletely fused spots, called lack of fusion, persist. A weld can lack union with the parent metal or with a previous weld bead. An adhesion joint forms, which can be rather strong in certain cases. It is much like a brazed joint or joint formed in metallisation : The pure lack of fusion is the more difficult is to detect it. With regard to the position of the lack of fusion defects in a well, three types of lack of fusion are. (1) Lack of side - wall fusion, (2) Lack of inter - run fusion, (3) Lack of fusion at the root of the weld.
A. Lack of fusion–In weld, incompletely fused spots, called lack of fusion, persist. A weld can lack union with the parent metal or with a previous weld bead. An adhesion joint forms, which can be rather strong in certain cases. It is much like a brazed joint or joint formed in metallisation : The pure lack of fusion is the more difficult is to detect it. With regard to the position of the lack of fusion defects in a well, three types of lack of fusion are. (1) Lack of side - wall fusion, (2) Lack of inter - run fusion, (3) Lack of fusion at the root of the weld.

Explanations:

Lack of fusion–In weld, incompletely fused spots, called lack of fusion, persist. A weld can lack union with the parent metal or with a previous weld bead. An adhesion joint forms, which can be rather strong in certain cases. It is much like a brazed joint or joint formed in metallisation : The pure lack of fusion is the more difficult is to detect it. With regard to the position of the lack of fusion defects in a well, three types of lack of fusion are. (1) Lack of side - wall fusion, (2) Lack of inter - run fusion, (3) Lack of fusion at the root of the weld.