Development And Application Of Military Multifunctional Welding Device

Military equipped vehicle is the main accoutrement which is put into effect on ground automotive operation. It is an important constituent of mechanomotive force in military fighting strength, and the matter base with which the force complete the protective training and the fighting support task. Many high and new technologies have been used in military equipped vehicle, such as microelectronic technique, computer technique, photoelectricity technique, new material technique, welding technique, hydraumatic technique etc., and make the performance of parts and the whole car increase greatly.Welding is used in automotive industry extensively. Periodic repair is important for military motors in order to keep their normal work. Welding is important for motor making and repair. Automotive engineering is not apart from welding. The development of automotive engineering needs the advance of welding engineering, the advance of welding engineering promotes the development of automotive engineering.A kind of multifunctional welding device has been developed for the practical requirement of repair in field army. This equipment is placed in repairing shop truck. With other equipments, the military equipped vehicle can finish welding and repairing work. GTAW, SMAW, spot welding, stud welding are included in this equipment. So it can be used to weld non-corrosive steels, aluminium plate, steel plate and other materials.The main circuit, control circuit and driving circuit of the device were studied and designed in the paper. The main circuit used the dual inverter structure. The SG3525A chip and the SG3526 chip were used respectively as PWM control chip for two inverter circuits. The corresponding driving circuit was designed. Compared with various power devices, power IGBTs were employed as the switches of two inverters. The parameters of the main circuit were designed and calculated. Soft -starting is designed to overcome the surge current for protecting main switches.The welding device has obtained scientific advanced second prize of Shenyang Military Area and practical new patent. The number of the patent: 200620090102.8. The device is working in Dalian servicing team of Shenyang equipped Military, and is ready to be used in Shenyang equipped Military.