EFFECT OF STEEL STRENGTH, Ms TEMPERATURE AND APPLIED FORCE ON RESIDUAL STRESS FORMED BY LOW TEMPERATURE TRANSFORMATION ELECTRODE

Abstract

  The effect of steel strength used for specimens, martensite transformation start (Ms) temperature of weld metals, and applied force to specimens after welding to residual stress is examined with joint specimens. FEM analysis, X-ray diffraction residual stress measurement, and loading test were conducted to investigate the basic behavior of residual stress condition, which is formed by residual stress controlling fatigue improvement methods. It is confirmed that Ms 250°C welding material forms large compression stress, but also Ms 350°C welding material can form compression stress. And the residual stress condition formed by low temperature transformation electronode near weld toe is not so changed even by nominal 130MPa applied force.