Arc Welding Processes
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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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