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Which of the following is not true? (a)Porosity is caused due to insufficient current

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Which of the following is not true?

(a) Porosity is caused due to insufficient current

(b) It is caused due to longer arc length

(c) It may be due to poor welding procedure

(d) It results in stress concentration

This question was addressed to me in an interview for internship.

This interesting question is from Weld Defects & Types of Joints in portion Welded Connections of Design of Steel Structures

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The correct option is (a) Porosity is caused due to insufficient current

Easy explanation: Porosity is formed when gas pockets or voids are draped during cooling process. It may be due to excessively high current or longer arc length or due to poor welding procedure. Porosity results in stress concentration and reduced ductility of metal.

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