WELDING EQUIPMENT

摘要

Conventional welding equipment has such a problem that when a fuse or a circuit breaker is not provided in the welding equipment, the fuse or circuit breaker in a switchboard for supplying power to the welding equipment must have such a value as can prevent burning of an apparatus in case of short circuit failure of a semiconductor element, and the welding equipment cannot be protected when a fuse or a circuit breaker having a higher value is used. Spreading of failure is achieved through a simple arrangement with low cost by monitoring the voltage of the semiconductor element, and interrupting an input power supply when the voltage applied to the semiconductor element becomes zero or lower than a normal voltage, thereby interrupting input power supply to the welding equipment.