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气体保护的电弧焊接是利用喷嘴流出的保护气流,如Ar、He、CO_2、Ar-CO_2等气体,在电弧和熔池的周围形成连续封闭的气流层,以防止周围空气对电极、熔化金属和邻近的基体金属产生有害的影响。焊接保护气流达到理想的层流运动状态,就能防止周围空气对焊接区域的污染,并且电弧燃烧也稳定,焊缝中不会产生气孔等缺陷,从而获得性能良好的焊缝接头。气体如果以紊流状态从喷嘴流出,由于气流的旋涡,空气极易被卷入,而破坏气体的保护效果。因此,研究一种测试方法,来鉴别焊接保护气流的形态和保护性能,对改进焊炬结构和喷嘴设
Gas-shielded arc welding is the use of a protective gas flow from a nozzle, such as Ar, He, CO_2, Ar-CO_2 and other gases, to form a continuous closed air flow around the arc and the weld pool to prevent the surrounding air against the electrode, molten metal and Adjacent base metals have a detrimental effect. Weld protection air flow to achieve the ideal laminar motion, you can prevent the surrounding air pollution on the welding area, and the arc combustion is stable, the weld will not produce holes and other defects, resulting in good weld joints. If the gas flows out of the nozzle in a turbulent state, the air is easily entangled due to the vortex of the air flow, thereby damaging the protective effect of the gas. Therefore, a test method was studied to identify the shape and protective properties of the welding shielding gas flow, and to improve the welding torch structure and nozzle arrangement