Spot-welder for thermal mechanical fatigue samples

The utility model belongs to the mechanical field which is used for the spot welding of thermal mechanical fatigue samples. The utility model particularly relates to a spot welder for thermal mechanical fatigue samples. The spot welder is provided with a current control part which comprises an autotransformer, a rectifying diode, and a capacitor, wherein the autotransformer which is connected with alternating current voltage on the input end is output by a diode D and the capacitor. The utility model can make the current of the spot welder have adjustability and satisfy the welding of different samples. In addition, an arranged trigger switch can finish instant welding and power cut and farthest reduce the damage of test samples. The utility model can use foot control in welding process which is not convenient to be manually controlled, and thus, the practicability of the utility model is also increased.