Which of the following is true about back-up strip provided at bottom of single-V grooves?(a) Back-up strips are commonly used when welding is done from both the sides(b) Back-up strips are commonly used whenroot opening is sufficient(c) It creates a problem of burn-through(d) It introduces a crevice into the weld geometryI had been asked this question in quiz.This is a very interesting question from Types and Properties of Welding in portion Welded Connections of Design of Steel Structures

Which of the following is true about back-up strip provided at bottom

1.	Which of the following is true about back-up strip provided at bottom of single-V grooves?(a) Back-up strips are commonly used when welding is done from both the sides(b) Back-up strips are commonly used whenroot opening is sufficient(c) It creates a problem of burn-through(d) It introduces a crevice into the weld geometryI had been asked this question in quiz.This is a very interesting question from Types and Properties of Welding in portion Welded Connections of Design of Steel Structures
Answer» The correct option is (d) It introduces a crevice into the weld geometry The best I can explain: Back-up strip is provided at the bottom of single-V/bevel/J or U grooves. It is commonly provided when WELDING is done from ONE SIDE or when the ROOT opening is excessive. It introduces a crevice into the weld geometry and prevents the problem of burn-through.

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