这主要与激光焊接线能量小，塑性变形区窄有关。
The main reason is that the speed of laser welding is very fast and the plastic zone is considerably narrow.
整个焊接板由弹性变形区、压缩塑性变形区、拉伸塑性变形区和熔池组成。
Whole weldment includes practically elastic deformation zone, compressive plastic deformation zone, tensile plastic deformation zone and melting pool.
模底接触区与自由变形区交界处的大塑性变形区依次处于板料曲面内双向伸长变形和平面应变状态；
The zone between the region contacted with bottom of the mould and the free forming region shows stretch forming and then transferred to plane strain state.
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