Question

Which of the following is true?

(a) incomplete penetration is found in fillet welds

(b) it is due to use of large size of electrodes

(c) it is due to excessive welding current

(d) it is due to insufficient welding rates

This question was posed to me by my college professor while I was bunking the class.

The question is from Weld Defects & Types of Joints topic in chapter Welded Connections of Design of Steel Structures

Answer 1

The correct choice is (b) it is due to use of large size of electrodes

To explain: Incomplete penetration is due to failure of weld metal to penetrate the complete depth of joint where full penetration has been specified. This defect is found in groove welds sue to unsuitable groove design for selected welding process, use of large size of electrodes, insufficient welding current, excessive welding rates.