Q550低合金钢焊接工艺研究
Study on the Welding Process of Q550 Low Alloy Steel

通过试验不同的焊接热输入和焊道温度对Q550钢接头力学性能的影响，对不同热输入下焊接接头进行了拉伸和硬度试验，并对其显微组织进行分析。结果表明，随着焊接热输入增加，焊缝中板条马氏体组织增加，粒状贝氏体下降，焊接接头性能变差。当焊接热输入为14.9 kJ/cm、焊道温度为100℃时，综合力学性能最佳。
By testing the effects of different welding heat input and weld bead temperature on the mechan-ical properties of Q550 steel joints, tensile and hardness tests were performed on the welded joint under different heat input, and their microstructures were analyzed. The results show that with the increase of heat input, the lath Martensite Structure increases, the Granular Bainite de-creases, and the properties of the joints become worse. When the welding heat input is 14.9 kJ/cm and the weld bead temperature is 100？C, the comprehensive mechanical properties are the best.