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Why is argon used in arc welding?

$\begin{array}{1 1} \text{High calorific value } \\ \text{Lowers the melting point } \\ \text{Flammability} \\ \text{Acts as a shielding gas} \end{array}$

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Answer: Acts as a shielding gas
Shielding gases are inert or semi-inert gases that are commonly used in several welding processes. heir purpose is to protect the weld area from oxygen, and water vapour. Improper choice of a welding gas can lead to a porous and weak weld, or to excessive spatter.
Argon being an inert gas is a cost-effective shielding gas because of its low relativity with metal to provide an inert atmosphere.
answered Jul 27, 2014 by balaji.thirumalai

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