A tack welder uses several short bursts of heat from equipment to create a temporary weld between two metal joints. It works through the same process as creating a full weld, but is used only for temporary joints. In this career, your job duties are to position the two or more joints of metal where they need to be then apply heat to them to create a tack weld. You also need to keep your work area clean and adhere to all safety procedures. To become a welder, you need to have general machining skills, which you can obtain in a technical college or technical prep program from high school. Your first welding job can give you valuable experience to start your career.