Due to the higher heating and cooling speeds of laser welding,both microstructure and composition in the welding seam are inhomogeneous,which might generate the possibilities of some kinds of defects.

• 激光焊接的快速加热及快速冷却特性决定了焊缝的成分及组织的不均匀性，由此导致了产生各种焊接缺陷的可能性。