Numerical analysis on residualstress in direct welded K-joint of steel tubular members

The direct welding K-joint of steel tubular members is a kind of usual joint of steel tube tower for large crossing of transmission lines. however, and the attachments of joint are often stressed complexly. The dynamic stress-strain and the subsequent formation of residual stress produce which were in welding process, are the main factors affecting the load capacity. Based on thermoelastic-plastic theory, the use of ANSYS software thermal-structural coupling function and the indirect method, combined with element birth and death technology, for calculation of temperature field and stress field, obtained the distribution of residual stress and residual deformation. The results showed that welding residual stresses both have tensile stress and compressive stress. However, the maximum of residual stress appears in the weld and the chord intersection, which is the main factors that cause weld tearing. This conclusion provides a reference for direct welding joint of steel tubular members of temperature field, stress and deformation analysis.