Báo Cáo Development of digital dc-arc welding machine

ABSTRACT
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This paper introduces the results of the development of a new mobile Digital DC-arc Welding
Machine (DDWM). A simple PI controller is applied to the DDWM to control the output welding
current tracking the constant setting current. Furthermore, a hot-start function, an anti-stuck function, a
standby mode and an intelligential circuit breaker (ICB) are included in the DDWM. The DDWM
increases welding quality and saves more power energy than a conventional welding machine.
Because the DDWM is changed from ready mode into the standby mode automatically after 2 minutes
interval from this unload start. Then the DDWM is changed into ready mode automatically since it is
reused to weld. Mover, the DDWM increases welding quality, productivity and reduces costs of
welding. So, the DDWM can have a great of contribution to the mobile welding industries. The
effectiveness of the DDWM was proven by the experimental results and durable test.

Key word: DC-arc welding machine, power switching IGBTs, hot-start function, anti-stuck function, ferrite transformer.