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Convex fillet welds are sometimes used in welding. Why?

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There are three types of fillet weld cross section profile, namely, flat, convex and concave. The convexity in convex fillet welds serve as reinforcement, which is believed to provide additional strength. However, care should be taken in not introducing excessive convexity to fillet welds.

Excess convexity leads to an increase in stress in weld toes which may subsequently fails by cracking.

Different types of fillet welds

This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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