Must be able to weld tig, mig, and flux core. Welds together metal components of products such as pipelines and boilers as specified by layout blueprints, diagram, work order, welding procedures, or oral instructions, using electric arcwelding equipment. Obtains specified electrode and inserts electrode into portable holder or threads consumable electrode wire through portable welding gun. Connects cables from welding unit to obtain amperage, voltage, slope, and pulse. Starts power supply to produce electric current. Strikes (forms) arc which generates heat to melt and deposit metal from electrode to workpiece and join edges of workpiece. Manually guides electrode or gun along weld line, maintaining length of arc and speed of movement to form specified depth of fusion and bead, as judged from color of metal, sound of weld, and size of molten puddle. Welds in flat, horizontal, vertical, or overhead positions. Examines weld for bead size and other specifications. May manually apply filler rod to supply weld metal. May clean or degrease weld joint or workpiece, using wire brush, portable grinder, or chemical bath. May repair broken or cracked parts and fill holes. May prepare broken parts for welding by grooving or scarfing surfaces. May chip off excess weld, slag, and spatter using hand scraper or power chipper. May preheat workpiece, using hand torch or heating furnace. Welds metal together, fabricate or repair products according to layouts, blueprints, or work orders, using brazing and variety of arc and gas welding equipment. Welds metal parts together using [WELDER GAS (WELDING)] or brazing [BRAZER, ASSEMBLER (welding)]. Using any combination of arc welding processes. Performs related tasks, such as thermal cutting and grinding.