1976 Volume 45 Issue 4 Pages 302-308
It is well known that welding deformations influence strength and ductility of weldments. In the present report, attention is forcussed to the effect of welding conditions, such as weld heat input, physical and mechanical properties of materials, size of weldment etc, on welding deformations in surfacing weld. Parameters which dominates welding deformations are deduced by the use of theories of heat flow and thermoelasto-plasticity. Experiments are carried out under various conditions, changing weld heat input, plate thickness and material, for investigating the effect of those parameters on welding deformations.
From this study. the following informations are obtained.
(1) Welding deformations are determined by the following parameters;
(a) Heat input T0*=α0Q/cρεY0h2
(b) Initial temperature θi*=α0θi/εY0
(c) Temperature above which yield stress becomes zero θM*=α0θM/εY0
(2) Welding deformations are determined by parameter Q/h2, θi when material is same.
(3) In the case of mild steel, welding deformations are not depend on welding processes such as GMAW, GTAW, SMAW and SAW, when Q/h2 is less than or nearly equal to 2500 cal/cm3.
(4) Conventionale formulae to calculate welding deformations are derived from the theory and experimental results.