Improving The Fatigue Strength Of Fillet Welded Joints By Grinding And Peening

Author:  Knight, J. W.
Source:  Welding Research Intl., Vol. 8, 1978, No. 6
Doc ID:  1978003
Year of Publication:  1978
Abstract:  
As an extension to earlier work, tests have been carried out on transverse non-load-carrying fillet welded specimens fabricated from both BS 4360 Grade 43 A and high strength steel (685 N/mm2 yield strength). Three grinding techniques have been studied: (i) heavy disc grinding; (ii) burr grinding; and (iii) full burr grinding. In addition, an investigation has been carried out into the effect of peening the weld toe region, with particular emphasis placed on the number of passes of the peening hammer along the weld. All the techniques gave improved fatigue performance, with 4-pass hammer peening resulting in the greatest improvement as well as being the cheapest method of operation. Descriptors: Carbon steels-- Welding; High strength steels-- Welding; Fillet welds-- Surface finishing; Grinding; Shot peening; Fatigue strength