Experiment on dressing for improving fatigue strengths of welded joints with low transformation temperature electrode

The fatigue strengths of welded joints in welded structures are much lower than those of the base metal because there are stress concentrations and tensile residual stresses at weld toe.Low transformation temperature electrodes(LTTE) dressing is an useful method for improving the fatigue strengths of welded joint.The fatigue tests of LTTE dressing were carried out on both transverse and longitudinal fillet welded joints.At cycles of 2×10⁶,the fatigue strengths of LTTE dressing are 154.7 MPa and 173.9 MPa,respectively,which is 101.4% and(100.3% of) those of TIG dressing.This shows that LTTE dressing in improving fatigue strength is useful or better than TIG dressing,while,LTTE dressing is easier than TIG dressing and it can deal with different position of weld beams.