焊点处形状记忆效应消失，在焊点熔核外热影响区以外形状记忆效应跟母材相同。
The shape memory effect in weld disappear, beyond the HAZ, shape memory effect resume.
并针对DP590GA焊点熔核中锌元素的残留现象，设计出加预热的双脉冲焊接规范，进一步改善其点焊接头的力学性能。
Aiming at the zinc residue in the weld joint nugget of DP590GA, a double-impulse welding parameter with preheating impulse is designed to further improve its mechanical properties of the weld joint.
试验结果表明，焊点强度满足要求，熔核尺寸符合要求。
The results show the strength and the dimension of spot meet the requirements.
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