Effect of Weld Toe Burr Grinding on Fatigue Strength of Transverse Welded Specimens Made From DH36 Steel

Abstract

The effect of weld toe grinding on fatigue life of welded joint has been studied by a number of investigators who have established that improvement factor on fatigue life is greater for higher tensile steels as compared with mild steels [1]. To establish the effect of weld toe grinding on the fatigue strength of joints made from DH36 steel, transverse welded specimens were tested under constant amplitude loading. This work was carried out by DAEWOO Shipbuilding and Marine Engineering Co. within Lloyds Register/DSME Joint Project. It was shown that the improvement factor on fatigue strength due to weld toe burr grinding for DH36 steel is above 1.5 for high cycle fatigue range.

Fatigue performance of tubular X-joints with PJP+ welds: I — Experimental study

“…In addition, many experimental efforts [18][19][20][21][22][23][24][25] have demonstrated the enhancement provided by the weld toe grinding on the fatigue life of welded joints. Polezhayeva et al [18] have proved, through an experimental investigation, that the weld toe burr grinding improves the fatigue strength by a factor of more than 1.5 for welded DH36 steel specimens under the high-cycle fatigue loading. Kyung et al [19] examined the effect of postweld treatments on the fatigue strength of fillet welded connections.…”

Stress relaxation due to ultrasonic impact treatment on multi-pass welds

“…These treatments can be categorised as techniques that affect the weld geometry and techniques that affect the stress state of the welded component. The former category includes grinding operations 5 and gas tungsten arc re-melting, 6 which reduce the contact angle between weld metal and base metal, thereby decreasing the stress concentration factor. The latter category is to release or re-distribute stresses, like peening techniques 7 and post weld heat treatments.…”