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The fatigue crack growth (FCG) behavior of the weld heat-affected zone of 14MnNbq bridge steel was systematically investigated in this paper. 从最弱链模型的物理本质出发，探讨了影响焊接热影响区脆性断裂的主要因素。
By means of controlling the weld process variables and self-temper temperature, the weld-softening zone width can be controlled, and then the load-bearing ability can be improved. 通过控制焊接工艺参数和自回火温度可以控制软化区的宽度，从而改善钢筋的承载性能。
Using the finite element method, a mathematical model of temperature field for weld-repaired zone of white cast iron is constructed, and temperature field and heat cycle are analyzed. 应用有限元方法建立了白口铸铁焊接接头焊补温度场的数学模型，对白口铸铁焊补温度场和热循环进行了分析。