新型水下焊接电源及送丝机构的研究  

New type of power source and wire feeding system for underwater welding

作　　者：钟继光[1] 石永华[1] 王国荣[1] 

机构地区：[1]华南理工大学机械工程学院,广东广州510640

出　　处：《电焊机》2005年第12期1-3,45,共4页Electric Welding Machine

基　　金：国家自然科学基金资助项目(50175027);广东省科技合作计划基金资助项目(20011654)

摘　　要：研究了一种新型的水下焊接系统。系统中弧焊电源输出阶梯型的外特性,送丝系统采用脉动送丝方式。在单片机控制下,脉动送丝波形与外特性同步调控。在停止送丝阶段,单片机令电源输出电压为峰值,焊丝在此电压下返烧并形成熔滴。送丝脉冲到来的瞬间,电源输出电压切换为基值。熔滴依靠送丝动量向熔池方向前进,最终向熔池过渡,随着焊炬的移动而形成一道焊缝。实验结果表明,使用这个系统进行气体保护药芯焊丝水下湿法焊接时,电压、电流波形均匀工整,短路过渡频率受控,焊接过程稳定,水下焊缝成形较为美观。A new type of underwater welding system is studied,which includes an oscillating wire feed system and a welding power souree with staircase, external charaeteristic. The output waveform of the oscillating wire feed system and the external characteristic are controlled and adjusted by a single-chip microcomputer （SCM） synchronously.When the wire feed is pausing in each oscillating cycle, the output voltage of power source is a peak value and the wire is melted under the welding voltage,forming a droplet metal. When the pulse of wire feed occurs, the output is switched to the base value. The drop of molten metal is then pushed to and then to be transferred to the molten pool eventually. As the torch is moving, a weld seam is formed. It is shown that the output voltage and current of the power source is uniform and stable when the system is used underwater with flux-cored wires. The frequency of short-circuit transfer is well controlled and the welding proeess is stable, which results in good shapes.

关 键 词：水下焊接 温法焊接 脉动送丝 药芯焊丝 

分 类 号：TG439.9[金属学及工艺—焊接]