Industrial welders (Cutters, Solderers, and Brazers) or maintenance welders join metal components of products, such as automobiles, boilers, ships, aircraft, and mobile homes. They accomplish this with specified layouts, blueprints, diagrams, work orders, welding procedures, or oral instructions, using electric arc-welding equipment. Welders connect cables from welding units to obtain amperage, voltage, slope, and pulse. They may clean or degrease weld joints or work pieces, repair broken or cracked parts, fill holes, and operate other machine shop equipment to prepare components for welding.