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针对高速列车转向架服役气候条件及对焊接接头低温韧性严格要求,采用夏比缺口冲击试验方法在不同温度条件下测试了Q345C钢母材试样及其MAG焊接头焊缝区试样的冲击功,观察了冲击试样在不同温度条件下的断口形貌,测定了各个试样的纤维断面率,得到了冲击功、纤维断面率随温度变化的关系曲线,确定了Q345C钢MAG焊接头的韧脆转变温度。试验结果表明,焊缝在-40℃时冲击吸收功可达71 J;焊缝韧脆转变温度ETT50为-41.16℃,FATT50为-37.34℃;Q345C钢MAG焊接头具有良好的低温韧性,可以很好地满足设计需求。
In view of the climatic conditions of high-speed train bogies and the strict requirements of low temperature toughness of welded joints, Charpy notched impact test method was used to test the impact energy of Q345C steel base material samples and their MAG welding seam weld zone specimens under different temperature conditions The fracture morphology of the impact specimen under different temperature conditions was observed. The fiber cross-section rate of each sample was measured. The impact energy and the cross-sectional area ratio of the fiber with temperature were obtained. The toughness of the MAG welding head of Q345C steel was determined Brittle transition temperature. The experimental results show that the impact energy absorbed by the weld at -40 ℃ reaches 71 J, the toughness and brittle transition temperature ETT50 of the weld is -41.16 ℃ and the FATT50 is -37.34 ℃. The weldability of the MAG welding head of Q345C steel has good low temperature toughness Good to meet the design needs.