无镀铜焊丝熔滴过渡形态与工艺质量的关系

综述了镀铜和无镀铜焊丝熔滴过渡形态与工艺质量的关系。两种焊丝GMAW焊接时,熔滴有大滴过渡、喷射过渡和短路过渡3种形态。在富氩混合气时都存在滴状向喷射过渡的转变电流。无镀铜焊丝在不同保护气体时的电弧改善、熔滴细化、转变电流均低于镀铜焊丝。焊接电流和电弧电压的正确匹配是获得满意过渡形态的重要条件。焊丝的工艺质量除了受焊丝和涂层成分及母材焊接性控制之外,主要受焊接工艺条件控制。通过工艺参数匹配的变化建立了熔滴过渡形态与焊丝工艺质量间的关系,其内在联系主要是熔滴尺寸和转变电流的变化。

Relationships between droplet transfer form and usability quality of non-copper-coated wire

In this paper,the relationships between the form of droplet transfer and the usability quality of copper-coated and noncopper-coated wire were reviewed.The results show that there are three kinds of droplet transfer form when using two kinds of GMAW welding wire:large droplet transfer,spray transfer and short circuit transfer;the transition current of the droplet from the droplet to the spray is present using argon-rich mixed gas.The arc of non-copper-coated wire is improved and the droplet is refined,and the transition current is lower than that of the copper-coated wire;the correct matching of welding current and arc voltage is an important condition to obtain satisfactory transfer form.In addition to the composition of welding wire and coating,and base metal weldability,the usability quality of welding wire is mainly controlled by welding process conditions.By means of the matching changes of process parameters,the relationships between the droplet transfer form and the usability quality of welding wire are established,and the internal connection is mainly the change of the droplet size and the transition current.