采用光纤激光微点焊实现了0.07 mm厚金属钽箔十字交叉点焊，研究了工艺参数对焊点尺寸及表面形貌和抗拉强度的影响。得出最佳工艺参数：在脉宽为8 ms时，脉冲激光功率在0.2～0.24 kW之间可以获得焊点尺寸较小，表面成形良好的焊点，此时焊点的最大抗拉载荷为7.77 N。此结构焊点拉伸断裂机制为脆性沿晶断裂，断口表面有比较明显的元素偏聚现象出现。

In this paper, laser micro welding of crossed 0.07 mm tantalum foils was performed. The influence of welding parameters on welding spot size, surface and tensile strength was studied. Results indicate that the optimal parameters are 8ms pulse width and impulse power between 0.2 kW and 0.24 kW. At the optimal parameters the largest tensile load of welding spot is 7.77 N. The fracture mode in the welding spot is a typical brittle intergranular fracture, which is accompanied by element segregation at the fracture surface.