Often called TIG welding is a welding process that joins metals by heating them with a tungsten electrode (nonconsumable) and a molten weld pool. The process may be used with or without the addition of filler metal. GTAW shielding gases generally include argon and helium or a mixture. Material thickness range from sheet metal to unlimited in all positions with applications such as pressure piping, vessels and other critical weldments. Material types used in GTAW include aluminum, copper alloys, nickel alloys, carbon / stainless steels, titanium and others. GTAW may be a manual, machine, semiautomatic or automatic welding process. Eye, face and skin protection are required.
(Also See MIG Welding) An arc welding process which joins metals by heating them with an arc. The arc is between a continuously fed filler metal (consumable) electrode and the work piece. Externally supplied gas or gas mixtures provide shielding. GMAW is commonly used to join carbon / stainless steel, aluminum, copper, magnesium, nickel alloys in all positions and material thicknesses. Transfer modes within GMAW include short circuit, globular, spray and recently surface tension. Shielding gases include argon, carbon dioxide, helium mixes and many other specialty gasses. Other names for GMAW are MIG and wirefeed welding. GMAW is generally a portable process with eye, skin and face protection required.