The Study Of An Alternating Double Arc Hybrid Welding Equipment And Process

With the development of the society, automotive, container industry and other industries has developed into the stage of rapid development. Competition between each other is very intense. In order to save costs and ightweight products, thin plate has been widely used. At the same time, the welding process on the thin plate would a higher demand.The key to increase the thin plate welding speed are: 1) Increasing the amount of deposited metal under the same conditions of heat input; 2) Reducing the temperature gradient at the weld toe. The traditional process of high speed welding of thin plate are mainly controlling welding heat input, unable to adjust the arc energy distribution problem. However, the distribution of arc energy has important influence on welding speed. Therefore, the development of compositing welding process that can not only solve the problem of arc welding heating input but also solve the arc energy distribution is very necessary.In this paper, An alternating TIG+MIG double arc hybrid welding process is presented whose main arc exists between the welding wire and the base material, one end of auxiliary arc exists in the tungsten electrode and the other end switches between the welding wire and the base material. When the auxiliary arc burning between the tungsten electrode and wire, the welding heat input can be reduced and the amount of deposited metal can be increased; when the auxiliary arc burning between the tungsten electrode and the base material, the welding heat input and the energy distribution can be changed and the temperature gradient is reduced. The relatively independent control of the amount of deposited metal and heat input can be achieved by adjusting the time ratio and strength of the two states in the auxiliary arc appropriately.Designed an alternating TIG+MIG double arc hybrid welding equipmen, and on this basis puts forward a control scheme of arc length. The composite welding power supply main circuit topology is analyzed, and the main power device selection. The design of control system with dsPIC30 F and PIC18 F series chip based, including the first inverter control, the second inverter control, high voltage arc stability control, driver circuit design, the feedback circuit design, man-machine interface system design, the wire feed system design. At last, we achieved the alternating compound welding process of the double arc welding power source.Through the high-speed camera system, we conducted a preliminary exploration on the double arc compound welding process. First, we analyzed the tungsten arc alternately switch process under 100 A current. Secend, we analyzed the drip transition of welding process when TIG and MIG arc single multiplexed.at last, we analyzed the drip shocks process when TIG and MIG arc compound welding. The results showed that composite welding system designed by this topic can be freely switched arc in space. In the double tungsten arc alternately composite welding process of TIG+TIG, tungsten transverse spacing is 2mm to 5mm, the power supply constant current output 100 A, Welding process can smoothly arcing and stable work,when the distance over 6mm will easy to appear the phenomenon of broken arc; In the TIG+MIG fixed arc single channel complex welding, DC power supply constant voltage 29 V, AC power supply constant current 0A to 120 A, wire diameter is 1.2mm and feeding speed is 5m/min to 7m/min, the welding system is stable, the existence of TIG arc can be realized to ensure the volume of weld metal and reduce the heat input and change the droplet trajectory;In the TIG+MIG alternating arc hybrid welding, DC power supply constant voltage 29 V, AC power supply constant current 60 A to 120 A,wire diameter is 1.2mm and feeding speed is 6m/min,secend arc length adjustment method is feasible. Auxiliary arc has an effect on the soluble drop shock.