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Arc Welding Processes. Arc Welding Processes. Lesson Objectives When you finish this lesson you will be able to: Explain similarities and difference between some of the various arc welding processes Explain flux and gas shielding methods

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Arc Welding Processes

  • Lesson Objectives
  • When you finish this lesson you will be able to:
  • Explain similarities and difference between some of the various arc welding processes
  • Explain flux and gas shielding methods
  • Explain advantages and disadvantages of the arc welding processes
  • Select between the processes
  • Learning Activities
  • Read Handbook Pp 1-16,
  • Look up Keywords
  • View Slides;
  • Read Notes,
  • Listen to
  • lecture
  • Do on-line workbook
  • Do homework

Keywords

Welding Flux, Inert Shielding Gas, Shielded Metal Arc Welding (SMAW), Gas Metal Arc Welding (GMAW), Metal Transfer Mode

arc welding processes
Arc Welding Processes
  • Welding processes that employ an electric arc are the most prevalent in industry
    • Shielded Metal Arc Welding
    • Gas Metal Arc Welding
    • Flux Cored Arc Welding
    • Submerged Arc Welding
    • Gas Tungsten Arc Welding
  • These processes are associated with molten metal

Electric Arc

protection of the molten weld pool
Protection of the Molten Weld Pool
  • Molten metal reacts with the atmosphere
    • Oxides and nitrides are formed
    • Discontinuities such as porosity
    • Poor weld metal properties
  • All arc welding processes employ some means of shielding the molten weld pool from the air
welding flux
Welding Flux
  • Three forms
    • Granular
    • Electrode wire coating
    • Electrode core
  • Fluxes melt to form a protective slag over the weld pool
  • Other purposes
    • Contain scavenger elements to purify weld metal
    • Contain metal powder added to increase deposition rate
    • Add alloy elements to weld metal
    • Decompose to form a shielding gas
shielding gas
Shielding Gas
  • Shielding gas forms a protective atmosphere over the molten weld pool to prevent contamination
  • Inertshielding gases, argon or helium, keep out oxygen, nitrogen, and other gases
  • Active gases, such as oxygen and carbon dioxide, are sometimes added to improve variables such as arc stability and spatter reduction

Argon

Helium

Oxygen

Carbon Dioxide

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