General Studies · Welding Defects
What does the term 'Lack of Fusion' denote when identifying arc welding defects?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1It is a group of small pinholes formed throughout the solidified weld metal due to gas entrapment.
- 2It is the failure of the filler metal to fuse properly with the parent metal or adjacent weld beads.✓
- 3It is the entrapment of non-metallic slag or other impurities within the weld metal.
- 4It is the failure of the filler metal to penetrate completely to the root of the welding joint.
Correct answer
It is the failure of the filler metal to fuse properly with the parent metal or adjacent weld beads.
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