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由于焊缝填充金属的不同和焊接热循环的作用，焊接接头不同区域有着不同的力学性能。本文将焊接接头模化为由两种材料组成，即母材金属和焊缝金属，用弹塑性有限元分析法计算了焊接接头强度组配对Ｊ积分和失效评定曲线的影响。结果表明，焊接接头不均匀强度组配对裂纹驱动力———Ｊ积分和失效评定曲线的形状与位置有很大影响。对于一个特定的焊接接头，如果接头为低组配或等组配，则以母材金属的极限载荷作为无因次载荷而建立的安全评定图较为保守；如果接头为高组配，则以焊缝金属的极限载荷作为无因次载荷而建立的安全评定图较为保守。
Due to the difference of weld filler metal and the effect of welding thermal cycle, different regions of welded joints have different mechanical properties. In this paper, the welded joints are modeled as two kinds of materials, that is, the base metal and the weld metal. The influence of the J-score and the failure evaluation curve of the welded joint strength group is calculated by the elasto-plastic finite element analysis. The results show that the shape and position of J-integral and failure evaluation curve have a great influence on the driving force of the crack in the non-uniform strength welded joint. For a particular welded joint, if the joint is low or equal, then the safety assessment based on the ultimate load of the parent metal as dimensionless load is more conservative. If the joint is of high assembly, The limit load of metal seams is more conservative as a safety assessment diagram established for dimensionless loading.