中文摘要：

随着激光器光束质量的改善和输出功率的提高，激光深熔焊接技术在激光加工和焊接领域的份额逐渐增加。对近期国内外激光深熔焊接领域的主要成果进行了概括和总结，讨论了激光深熔焊接的特点和局限性，同时也对激光深熔焊接技术在大功率激光器的开发、激光深熔焊接过程的稳定性、等离子体控制、外加辅助电磁场、激光一电弧复合焊接技术等方面的主要研究特点进行了分析和讨论。结合科技发展趋势和激光焊接技术的特点，对激光深熔焊接技术的研究重点进行了讨论和展望。

英文摘要：

With the improvement of laser beam quality and the increasing of laser power output, the percentage of deep penetration laser welding increases gradually in laser processing and welding field. The recent major research achievements of deep penetration laser welding have been summarized, meanwhile, its characteristics and limitations have been discussed as well. And then many important advances have been analyzed and discussed in the field of deep penetration laser welding, such as the research of high power laser, stability of laser welding process, control of laser-induced plasma, auxiliary electromagnetic fields, laser-arc hybrid welding and so on. Finally, the development foreground of deep penetration laser welding in the future is prospected.