Improving the Fatigue Strength of Welded Joints by Peening

Author:  Maddox, S.J.
Source:  Met. Constr. 17, (4), Apr. '85
Doc ID:  1985052
Year of Publication:  1985
Abstract:  
A review is presented of investigations on effects of peening to improve the fatigue strength of welded joints by introducing compressive residual stresses at the weld toe. Two techniques are described: hammer peening and shot peening. Data including S--N curves are presented to show effects of peening and applied stress ratio on fatigue strengths of transverse non-load carrying fillet welds in mild steel, quenched and tempered steel, and A1 alloys. Practical applications of peening are discussed. Other aspects covered include behaviour in service, corrosion and increased susceptibility to fracture of peened welds. Descriptors: Carbon steels-- Structural hardening; Aluminum base alloys-- Structural hardening; Welded joints;; Structural hardening; Shot peening; Fatigue strength-- Welding effects