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为解决气焊生产效率低的问题,可先使焊丝本身进行电阻预热到1073～1673°K,然后由气体火焰加热母材和焊丝,使焊速大大加快。预热焊丝的半自动气焊设备是由气焊所用的乙炔发生器和氧气瓶组成,由控制箱使送丝机构等速送丝(用一般CO_2焊机的送丝机构也可以),及电阻预热焊丝的小功率交流电源(空载电压U_ο=7～12伏的可调交流电源,短路电流为50～200安)。另外还需要将原有焊枪稍加改装,附加。丝管、绝缘手把及导线接头和控制按钮导
In order to solve the problem of low production efficiency of gas welding, the electrical resistance of the welding wire can be preheated to 1073 ~ 1673 ° K first, and then the base metal and the welding wire are heated by the gas flame so that the welding speed is greatly accelerated. The semi-automatic gas welding equipment for preheating the wire is composed of an acetylene generator and an oxygen cylinder used for gas welding. The control box enables the wire feeding mechanism to feed the wire at a constant speed (the wire feeding mechanism of the common CO_2 welder is also applicable) and the resistance preheating wire Low-power AC power supply (no-load voltage U_o = adjustable 7 ~ 12 V AC power supply, short-circuit current of 50 ~ 200 A). In addition, the original torch also need to be slightly modified, additional. Wire tube, insulated handle and wire connector and control button guide