This dent repair machine combines a variety of welding and heating functions and will be a good assistant for carrying out dent repair. TypeSpot Welder Dent Puller. Selectable Mode: Spot Welding Straight Pull, Round Gasket Welding, Long Gasket Welding, Wave Line Welding, Stud Welding, Carbon Rod to Close the Fire, Single-sided Spot Welding.