介绍了一种新的动态控制等离子焊接工艺。该工艺能够在保持完全焊透的情况下减少对被焊材料的热输入。利用该工艺对Ti-6Al-4V合金实施平板对焊。利用光学显微镜、扫描电镜(SEM)和显微硬度计对焊接接头的显微组织、断口形貌和显微硬度进行表征。与钨极电弧焊接和常规的等离子焊接相比较,使用本工艺提高了焊接质量,其原因在于:1)由于热输入的减少,焊缝中先析出的β相晶粒大幅度减少,从而使马氏体的形成得到抑制;2)焊接接头具有更好的韧性和更高的硬度。 A new dynamic control plasma welding process is introduced. The process reduces the heat input to the material to be welded while maintaining full penetration. Ti-6Al-4V alloy using the process of flat-plate butt welding. The microstructure, fracture morphology and microhardness of the welded joint were characterized by optical microscope, scanning electron microscope (SEM) and microhardness tester. Compared with TIG welding and conventional plasma welding, the welding quality is improved using this process because: 1) the decrease of heat input significantly reduces the amount of β-phase grains precipitated in the weld seam, The formation of the body is suppressed; 2) the welded joints have better toughness and higher hardness.