MCG 4340 Lecture Notes - Lecture 1: Gas Tungsten Arc Welding, Gas Metal Arc Welding, Arc Welding

• School: University of Ottawa
• Department: Mechanical Engineering
• Course: MCG 4340
• Professor: Catherine Mavriplis

Document Summary

Heat steel, then introduce oxygen stream to oxidize steel to cut it. Gas flow is super-heated in a small space, creating plasma. This is done with tungsten electrodes inside the nozzle initiating flow with pilot arc in nozzle. Arc transfers to material to start cutting. Uses fuel, oxygen, pressure regulators, hoses and torch. Neutral flame makes co2 to act as shielding gas to protect steel from oxygen while molten. Uses electric cables, electrode holder, electrode and part to weld. Electric arc made between electrode and work piece, and flux coating on electrode is vaporized to make gas to shield the molten metal from oxygen. When cooled, the flux creates slag to protect weld zone (chip this off later) Similar to oaw heat sources melts metal being welded under shielding gas. Electric arc is made from tungsten electrode to create heat to melt the metal. Shielding gas protects electrode and molten metal from oxygen.