Development Of PMIG Welding Inverter With Microcomputer

PMIG welding is a high-quality welding method.It is developed widely for its good direction transition , less splashed material and nice figure . And PMIG welding power supply is developed quickly with the extending of PMIG welding.Control part is decisive for the inverter's performance in arc welding power supply.Integrated amplifier is the cneter of the control system for most arc welding power supply at present,which is hard to meet the higher and complicated requirement of control only by the analogcurrent.while using the inverter with the microcomputer control is not only meet the basic demand of the common arc welding power supply,but also is of high precision and multi_fuctiong.So the inverter with microcomputer has been the trend of development for arc welding power supplies.Consequently ,a PMIG inverter with single chip microcomputer is developed in this paper.It includes the full bridge inverter system based on IGBT and the single chip microcomputer system cnetered on 80C196KC .Through flexible software,different given signal of welding current was outputted by the single chip microcomputer system,which can control the welding current.On the other hand,using the single chip microcomputer ,sequence control and two/four step control method of the inverter can be realised according to the demand of the welding process.For the inverter this paper designed ,friendly interface is provided,which make the parameter of the four welding method can be set and adjusted conveniently.Because of hard working circumstances of high current and high magnetic field ,the single chip microcomputer system worked abnormally. In result ,anti_interference problem is the key of this paper.Series of effective measures are taken to improve the anti_interference ability of the system.The results of the exprement show that the PMIG inverter with the single chip microcomputer this paper designed is of sinple operation ,flexible using and strong anti-interference ability and suitable to weld steel and alnumium and so on.