Argon is used in arc welding because of its a) flammability b) low reactivity with metal c) high calorific value d) ability to lower the melting point of metal

Option b) low reactivity with metal. Since Argon is less reactive, it is used to create an inert gas. Argon is usually blended with hydrogen (H2​), helium (He), carbon dioxide (CO2​), or oxygen (O2​) to enhance the arc characteristics or facilitate metal transfer in gas metal arc welding.

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