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由于桥梁钢断裂韧度CTOD评估时没有相应的产品标准或者行业规范规定其允许值δmin,无法直接开展韧度评估,因此提出了采用失效评定图评估方法将断裂试样假定为带缺陷构件的间接评估方法,并依据此方法完成了桥梁钢Q420qD的焊接接头母材、焊缝、热影响区的断裂韧度CTOD评估,验证了该方法的可行性。评估结果表明,桥梁钢Q420qD母材和热影响区相对焊缝更安全,焊缝在常温下断裂韧度CTOD合格,但低温下极有可能开裂。
Since the fracture toughness of bridge steel CTOD assessment does not have the corresponding product standard or the industry standard stipulates its allowable value δmin, it is impossible to directly carry out the evaluation of the toughness. Therefore, the assessment method of failure assessment chart is adopted to take the fracture specimen as the indirect According to this method, the fracture toughness CTOD of the welded joint of bridge steel Q420qD was evaluated, and the feasibility of the method was verified. The evaluation results show that the relative weld of Q420qD base metal and heat affected zone of bridge steel is safer. The fracture toughness CTOD of weld is qualified at room temperature, but it is very likely to crack at low temperature.