采用脉冲Nd:YAG激光对锆4合金的十字交叉焊点进行试验研究，从焊点形貌、焊点成形系数和力学性能方面，研究了脉冲激光工艺参数对锆4合金十字交叉点焊的影响规律。研究表明：脉冲能量较小时，激光热量输入不能充分熔化交叉焊点预留凸台，焊点余高较大，无法满足实际应用要求。在单位脉冲能量一定的前提下增大峰值功率减小脉冲宽度，或增大激光脉冲的发射个数均可改善焊点的成形，减小焊点余高，得到较大的焊点深宽比。十字交叉焊点的最大拉伸载荷与焊点的深宽比成正比关系。

A study on intersected points of Zircaloy-4 alloy is carried out by using pulsed Nd:YAG laser. The effects of laser parameters on the intersected points are analyzed from the appearances, depth-to-width ratio and mechanical properties. The results show that the protrusion of the weld beads can not meet the demand because the convex platform fails to be molten amply with the improper parameters. With the peak power increasing and the pulse width decreasing, or the number of shots increasing when the single pulse energy remains unchanged, the protrusion of the weld beads decreases, and the depth-to-width ratio of the weld beads increases. The maximum tensile loads of the intersected points are proportional to the depth-to-width ratio.