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Arc Welding

Arc Welding

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Arc Welding

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  1. Arc Welding

  2. What is Arc Welding? • The fusing of two or more pieces of metal together by using the heat produced from an electric arc welding machine.

  3. Basics of Arc Welding • The arc is struck between the electrode and the metal. • It then heats the metal to a melting point. • The electrode is then removed, breaking the arc between the electrode and the metal. • This allows the molten metal to “freeze” or solidify.

  4. How an arc is formed? • The arc is like a flame of intense heat that is generated as the electrical current passes through a highly resistant air gap.

  5. Welding Processes • SMAW (Shielded Metal Arc Welding) • GMAW (Gas Metal Arc Welding) • GTAW (Gas Tungsten Arc Welding) • Oxygen/ Fuel Welding

  6. SMAW • Also referred to as “Stick Welding” • Used for everything from pipeline welding, farm repair and complex fabrication. • Uses a “stick” shaped electrode.

  7. Can weld: steel, cast iron, stainless steel, etc. • Can also hardface with correct electrode.

  8. Examples of SMAW Welds

  9. Types of SMAW Machines

  10. AC Welding Machine • Most common type found in homes, farms, etc. • Good for farm repairs, light jobs. • Low cost

  11. DC Welding Machines • Often generator type machines • Diesel or gasoline engine driven • Portable • Expensive

  12. AC/DC Welders • Can weld in AC or DC polarity • Less expensive than DC machine • Quieter than DC machine

  13. Arc Welding PPE

  14. GMAW • Also referred to as “MIG” welding • Uses a shield gas and a continuous wire electrode • Used for all types of fabrication • Great for thin metals up to ¼” • Excellent speed of deposition • Used for metals such as: steel, aluminum and stainless steel.

  15. GMAW Welds

  16. MIG Welding Benefits • All position capability •  Higher deposition rates than SMAW •  Less operator skill required •  Long welds can be made without starts and stops •  Minimal post weld cleaning is required

  17. GTAW • Also referred to as “TIG” Welding • Uses a shield gas, a non-consumable tungsten electrode and a hand fed filler rod • Excellent for welding thin metals, pipeline welding and exotic metals • Highly skilled labor needed for this process

  18. GTAW Welding Benefits • Superior quality welds •  Welds can be made with or without filler metal •  Precise control of welding variables (heat) •  Free of spatter •  Low distortion

  19. Oxygen/ Fuel Welding • Utilizes oxygen and a fuel gas to heat metal until it is in a molten state and fuse multiple pieces of metal together. Can be used with or without a filler rod. • Great for brazing dissimilar metals together. • Older technology that can be replaced by GTAW