钢材应具有明显的屈服台阶，且伸长率应大于20%。
Material of steel should have obvious yielding step, and the elongation ratio more than 20%.
研究了收弧坑的接头性能，其抗拉强度和伸长率均不低于中间焊缝。
The weld mechanical properties of the joint at the end of the weld were...
搭接接头的塑性较差，伸长率仅有3.18%，不及母材伸长率的25%；
The elongation of joints was only 3.18%, less than 25% that of base metal.
搭接接头的塑性较差，伸长率仅有3.18%，不及母材伸长率的25%；
The elongation of joints was only 3.18%, less than 25% that of base metal.
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