研究小尺寸不锈钢片脉冲激光焊接的特点,着重分析焊接参数对焊缝熔透状况和焊缝宽度的影响。实验表明,随着脉宽增大,激光功率密度的熔透阈值减小,平均功率的熔透阈值线性增加;但是功率密度不能无限减小,为了保证熔透它必须在某一极限值以上。影响焊缝宽度的主要是激光功率密度、脉冲宽度和脉冲频率这三个参数。本文为散热条件受限的小尺寸工件精密激光焊接提供了有益的经验,同时也为加工过程的数值模拟分析提供了实验基础。 The characteristics of pulsed laser welding of small size stainless steel sheets were studied, and the influence of welding parameters on weld penetration and weld width was analyzed. Experiments show that with the increase of the pulse width, the penetration threshold of the laser power density decreases and the average power penetration threshold increases linearly; however, the power density can not be reduced indefinitely, and it must be above a certain limit to ensure penetration. Affect the weld width is the main laser power density, pulse width and pulse frequency of these three parameters. In this paper, we provide useful experience for the precision laser welding of small size workpieces with limited heat dissipation, and provide the experimental basis for the numerical simulation analysis of the machining process.