<p>A welding machine is provided with a control unit (12) having a timer section (15) for counting the time and date and a memory section (17) for storing the time and date counted by the timer section (15). The control unit (12) starts a predetermined controlling operation to avoid excessive temperature when the counting of the timer section coincides with the time and date that associate with the time and date stored in the memory section (17) thereby eliminating the need of a temperature sensor.</p>
