Spot Welder is used for the dentistry to ... greasy dirt etc.3.2 The piece of welder needs to cleanliness, no oxidization, without greasy ... , q_X, h_X three types. The meaning indicates: spot welding, braze welding, backfire welding, press this button ... bad touch, prevent the splash thing burn human body, the operator must use the protection glasses and ... by the professional personnel in time. Spot Welder