Fatigue Strength of Welded Built-up Beams of SS41, SM50, SM58 and HT80 Steels

Abstract

This thesis deals with the bending fatigue test results of welded built-up beams of SS 41, SM 50, SM 58, and HT 80, respectively. The fractures of all these beams initiated at the flange-to-web fillet weld under bending, and it took about 10, 000 or 36, 000 cycles of loading from a visible crack to separation of the flange plate.
The test results are compared with those of the welded built-up beams and the longitudinal fillet welded specimens obtained by other investigators. The longitudinal fillet welded specimens indicate the same as or a somewhat greater fatigue strength, than the beams in bending.