Welding techniques overview

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Welding techniques overview

  1. 1. Welding Techniques Overview
  2. 2. Stick Welding • MMA = manual metal arc welding or stick welding • SMAW = Shielded Metal Arc Welding • electrode core itself acts as filler material, no need separate filler • Limited to welding ferrous materials (special electrodes for cast iron, nickel, aluminum, copper, and other metals)Stick as electrode and filler
  3. 3. Stick Welding (2)
  4. 4. MIG • MIG = Metal Inert Gas • GMAW = Gas Metal Arc Welding • continuous wire feed as an electrode and an inert/semi- inert gas mixture to protect the weld from contamination, no need separate fillerUsing shieldinggas
  5. 5. MIG (2)GMAW Circuit diagram. (1) Welding torch, (2)Workpiece, (3) Power source, (4) Wire feedunit, (5) Electrode source, (6) Shielding gassupply. GMAW torch nozzle cutaway image. (1) Torch handle, (2) Molded phenolic dielectric (shown in white) and threaded metal nut insert (yellow), (3) Shielding gas diffuser, (4) Contact tip, (5) Nozzle output face
  6. 6. TIG • TIG = Tungsten Inert Gas • GTAW = Gas Tungsten Arc Welding • Tungsten electrode core, with argon as shielding gas • Smoother result and reduce crater/pinhole • can be used on nearly all weldable metals, most often applied to stainless steel and light metals
  7. 7. TIG (2)
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