The Manufacture Of Argon Arc Welding Magnetic Control Power Source And Technology Experiment

The applications of argon arc welding is wide in the welding range, in order to improve the quality of welding and welding productivity, people introduce magnetic field in the welding process, using the magnetic field to improve the welding seam microstructure and the first crystallization, refine grain, heighten the quality. This paper applies inverter technology to develop a new kind of argon arc welding magnetic control power, which should enable the exciting current and welding current to match in a certain extent, and output intermittent alternating square-wave pulse. It has the characteristics of small volume, light weight, simple circuit, convenient adjustment etc.In this paper, it designs synchronous circuit, pulse generating circuit, discharging circuit of argon arc welding magnetron power, and the feedback circuit, protection circuit are improved. The design of synchronous circuit involves components number less, and design of discharging circuit makes the energy released fully in coil, which solutes problems that coil overheat cause equipment damage. Magnetic control power is debugged, the test waveforms is given. Experimental results show that magnetic control power can output alternating intermittent square-wave pulse that is matched with welding current, and can continuously steady working, meet the demand of welding experiments. Topics also devise head structure, and simulate the magnetic field distribution, show the factors which affect the distribution of the magnetic field.Using the developed magnetic control power, synchronous magnetic field is applied in MIG welding. It analyzes synchronous magnetic field influences on metal transfer and the characteristic of arc motion with the advanced high-speed video camera technology. Comparing with the welding seam and microstructure, the result shows that applying synchronous magnetic field can make the melt drops transition smooth, obtain the stable transition form, and refine grain effectively. It's tested the practicability of the developed magnetic control power successfully.