同时，还讨论了在焊接构件安全评定中COD准则的局限性。
Meanwhile, the limitation of the COD criterion in estimating the safety of welded structures is discussed also.
异种金属焊接会增大焊接构件搅拌区内较软材料一侧的残余应力。
The residual stress of the softer metal in the nugget zone can be increased in the joining of the dissimilar metals.
为了预测焊接构件在中温环境下的疲劳裂纹扩展寿命，提出了一组新的疲劳裂纹扩展方程。
To predict the fatigue crack growth life of welded equipments at elevated temperature, a group of novel fatigue crack growth equations was proposed.
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