钛型气保护药芯焊丝熔滴过渡与气孔(压坑)的关系

Relation between metal transfer and porosity of titanium type gas shielded flux-cored wire

采用改变药芯组成物配比、平板堆焊和电弧物理观察等试验方法,研究钛型气保护药芯焊丝熔滴过渡与气孔(压坑)敏感性间的关系。结果表明,细熔滴过渡时气孔(压坑)倾向大,熔滴在电弧中吸收氢的总量是形成气孔(压坑)的主要因素;促使熔滴细化的药芯组成物具有增大气孔(压坑)倾向的作用;焊接工艺参数中,焊接电流、电弧电压对熔滴过渡形态-气孔(压坑)倾向影响的规律性,基本遵循了"熔滴过渡形态对气孔的影响理论"所揭示的机理。

The relation between metal transfer and porosity(press hole) sensitivity of titanium type gas shielded flux-cored wire were studied by adjustment of flux composition,plane plate butting welding,and physical observation of welding arc,etc.The results show that the porosity tendency is serious when the droplets are fine.The total content of the hydrogen drawn in the arc by the droplet is the main factor to form the porosity.The flux component that makes the droplet fine can lead to the formation of porosity.The influence of welding parameters such as welding current and arc voltage on the transferring shape of droplet and porosity tendency basically follows the mechanism that is revealed by the theory about the effect of the droplet transferring shape on the porosity.