【摘要】 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。更多还原

【Abstract】 The characteristic of pulsed laser welding process of small - size stainless steel sheets is studied and how welding parameters affect the penetration status and the width of welding line is specially analyzed. Experimental results show that the penetration threshold of laser power density decreases and the one of laser average power increases with the increment of pulse time, but laser power density cannot be always reduced, it must maintain above a certain limit to ensure the penetration. The parameters , which significantly affect the width of welding line, are laser power density, pulse time and frequency. This paper not only offers some useful experience for precise laser welding of small - size workpieces whose condition of heat transferring is limited, but also establishes experimental foundation for numerical simulation analysis of the welding process using Finite Element Method.更多还原