The Design Of Controlling System With PLASMA-MIG Welding

With the development of technology of welding, single plasma arc welding or MIG arc welding plays more and more role in automatic welding aluminum and its alloy. A new way-plasma-MIG welding?has been adopted in abroad quickly, but it has few use in our country.The research in this paper is a new system controlled by PLC which had been designed to weld AL and alloy of AL with plasma-MIG. The core of the system adopts one type of PLC of Simens, which is a sort of S7-300, and its additional devices, including DI,DO,AI.AO modules. Welding powers are different, one is TPS5000, the other is ARGP300. The two powers are manipulated harmoniously by single of PLC system. Varying mechanic, machine of supplying line, cooling system of cycling water, and mechanic of three version moved bystepping motors are all controlled by the PLC. And touching panel of LCD gives more friendly HMI. At the same time, the design ofsoftware adopts the way of modules. There are twelve sorts of programs with fixed parameters to weld different workpieces in pipes and plates of AL and its alloy. Another two sorts of those without parameters are given to the user to input right parameters to weld the special workpieces of pipes and plates eachly.The result of system indicates that it can weld different forms of workpieces with different thick. A welding torch can move precisely when welding products. The face of weld is smooth, and the quantity is good. The velocity of this system is quick, and the efficient is high. When welding plate of 8mm, the velocity can reach 0. 5m/min.The controlling system of the design deals with the problem costing much money to buy the similar device so as to save 1/3 or more, the other role helps some application and some references ofresearch and it will throw a light on the new area of welding in Plasma-MIG welding.