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试验内容包括微观结构观测,采用夏比冲击试验评估高强热机械控轧(TMCP)钢(SM570-TMC)焊缝在寒区的适用性。利用传统结构钢(SM490B)焊缝进行对比试验。采用标准V形缺口夏比试样,在动力荷载下进行试验。推导焊缝金属、HAZ(热影响区)和基底金属的操作温度,通过吸收的能量、冲击试验要求和微观结构评估其对寒区的适应能力。试验结果显示:与SM490B焊缝相比,SM570-TMC焊缝的基底金属低温下具有较高的冲击韧性,而HAZ和焊缝金属的冲击韧性远低于基底金属,且其操作温度与SM490B焊缝相似。结果表明:在寒区应用TMCP钢焊缝时,应选择合适的焊接工艺以保证低温下HAZ的冲击韧性,并采用适当的焊条,而这也是未来研究工作的目标。
The tests included microscopic observations and the applicability of the Charpy impact test to the cold weld of TMCP steels (SM570-TMC). Contrast test with traditional structural steel (SM490B) weld. Standard V-notch Charpy specimens were tested under dynamic loading. The operating temperatures of the weld metal, HAZ (heat affected zone) and base metal are deduced, and their adaptability to cold areas is assessed by the absorbed energy, impact test requirements and microstructure. The experimental results show that the base metal of SM570-TMC weld has higher impact toughness at low temperature than that of SM490B weld, while the impact toughness of HAZ and weld metal is much lower than that of base metal, and the operating temperature is similar to that of SM490B Similar The results show that when TMCP steel weld is used in cold area, proper welding process should be selected to ensure the impact toughness of HAZ at low temperature, and the appropriate welding rod should be chosen, which is also the goal of future research work.