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 ... the machine to the dependable place.3. Use AC stabilized supply, if possible, since it can guarantee ... by the professional personnel in time. Spot Welder