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21

Technical Services

Shielding Gas Functions

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Provides a plasma for commutation of current

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Protects the weld pool from reaction with air environment

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Provides cleaning action, which partially removes the aluminum oxide from the base material (DCEP)

Properties of Shielding Gases

Argon

Helium

Advantages

Good arc initiation and stability

Higher arc voltage

More effective shielding

Broad weld root width

Lower cost

Reduced porosity

Good cleaning

Disadvantages

Narrow weld root width

Poor cleaning

Poor arc initiation and stability

Higher cost

Higher flow rates required

Shielding Gas for Arc Welding Aluminum

Argon

Helium