In order to improve the stability of the high-current GMAW (gas metal arc welding) process and thus improve the welding efficiency, an intermittent alternating longitudinal magnetic field is introduced to control the welding process. In this paper, a two-level inverter topology is used to develop a magnetron power supply whose output is a square wave AC current with adjustable amplitude, frequency and duty cycle. The simulation model of the magnetron power supply is established by using the visual simulation software Simulink, the simulation results of the circuit under different given parameters are analyzed, and the rationality of the main circuit topology and parameter design is demonstrated. Inductive load is added to test the actual current output waveform and alternating magnetic field waveform of the magnetron power supply under different given parameters. The test results show that the designed magnetron power supply can meet the characteristics of frequency, duty cycle and exciting current amplitude adjustment. At the same time, an alternating magnetic field that matches the output of the power source is obtained, which can be used in high-current GMAW magnetron welding technology.
GMAWalternating longitudinal magnetic fieldinverterSimulink simulation
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