Cracking threshold of the welded joints subjected to high-cyclic loading

Abstract

The paper presents the data on the resistance to cycle loads of welded steel plates of double-welded, heat-treated and rewelded (repaired) joints. The microstructure and mechanical properties of the basic metal and the weld have been estimated and the results of high-cycle fatigue experimental and analytical research have been presented. By testing compact tensile specimens CT, threshold values are obtained when the crack growth rate is near v = 10-12 m/cycle. It has been found that, depending on the location of the plane of crack propagation in the joint, the threshold varies from 5.7 MPam till 23 MPam in differently obtained welds.