Experimental Study on Effects of Gas-shielding in Lap-fillet Arc Welding

In order to clarify the relationship between shielding gas flow and shieldability during a lap-fillet arc welding, oxygen concentration measurements on water-cooled copper which imitated lap-joint in tungsten inert welding were conducted. Moreover, high-speed plasma visualized by schlieren method observation using tube electrode xenon gas, respectively. As result, low-oxygen region, where was less than or equal 100ppm, formed copper. It suggested that this because separated into upper side lower of step part, intrusion atmosphere prevented increase velocity flowing around flow. When length set be long, although position region changed, there small difference caused torch angle. However, when short tilted, blocked it did not step. became worse narrow due low-speed flowed These results obtained study could improved controlling length.