In most cases, EGW will use carbon dioxide as shielding gas, but sometimes pure argon, argon-carbon dioxide mixed gas, argon-oxygen mixed gas and argon-helium mixed gas will also be used. Flux welding wire, which can form welding slag and make the weld look beautiful, is often used as welding wire, but solid welding wire is sometimes used.
By sealing the molten pool with base metal end, copper lining or refractory lining material, molten metal can be prevented from dripping and vertical welding can be carried out, so thick plates can be welded in a single pass (single operation). Its applications include welding vertical joints, such as ship's side panels, bridge buildings, storage tanks and pressure vessels.
Extended data
The welding quality of gas-electric vertical welding is greatly influenced by the length of welding arc, and its arc length must be controlled. Based on the crawling gas-electric vertical welding robot, the change of arc length in welding process is studied, and a two-stage linkage arc length control system based on welding trolley and slider is established.
The fast and high-precision control of arc length is realized by using the characteristics of strong dynamic response and high precision of the slider, and the automatic centering of the slider is realized by controlling the trolley, which increases the adjustment ability of the system. The results show that the system has strong anti-interference ability, dynamic response ability and self-adjustment ability.
Baidu Encyclopedia-Starting Point Li Han