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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Effect of Material Thermal-Physical Parameters on Weld Pool and Residual Stress Peak Value

Get access (open in a dialog) DOI: 10.1615/IHTC15.nsm.008760
pages 5817-5826

要約

During welding, the thermal–mechanical parameters of low-alloy-high-tensile (LAHT) pipeline steels have an important impact on the weld pool penetration depth (WPPD) and residual stress. By using the ANSYS numerical simulation software, the influence of the yield stress, heat conductivity, specific heat, elastic modulus and coefficient of thermal expansion on the WPPD and residual stress peak value (RSPV) is analyzed. The results reveal that a drop in the thermal conductivity leads to increase in the WPPD as well as the RSPV, while the specific heat has a marginal influence on the WPPD and RSPV. However the difference between the RSPV and yield stress becomes larger with increase in the yield stress and the RSPV gradually increases with the coefficient of thermal expansion. When the elastic modulus is small, the RSPV appears within the weld seam; and with increase in the elastic modulus, it increases and moves away from the weld seam. During the experiments, the welding temperature field is measured by using type–K–thermocouples. The simulation results are in good agreement with the test results, and the relative error between simulation results and test results is within 10.7%, which bolsters the validity of the simulation results.