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Argon is used in arc welding because...

Argon is used in arc welding because

A

low reactivity with metal

B

ability to lower the melting point of metal

C

flammability

D

high calorific value

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### Step-by-Step Solution: 1. **Understanding the Purpose of Argon in Arc Welding**: - Argon is a noble gas, which means it has a complete outer electron shell and is chemically inert. This property makes it very stable and unreactive with most materials, including metals. 2. **Role of Argon in Welding**: - In arc welding, an electric arc is created between an electrode and the workpiece. This high-temperature arc melts the metal, allowing it to fuse together. - The presence of an inert gas like argon helps to shield the molten metal from atmospheric gases such as oxygen and nitrogen, which can cause defects in the weld. 3. **Blending with Other Gases**: - Argon is often mixed with other gases like carbon dioxide (CO2), hydrogen (H2), or helium (He) to improve the welding process. These mixtures can enhance the arc stability and improve the quality of the weld. 4. **Conclusion**: - Due to its low reactivity and ability to provide a protective atmosphere during the welding process, argon is widely used in arc welding applications. 5. **Correct Option**: - Based on the explanation, the correct answer to the question is that argon is used in arc welding because of its low reactivity with metals.
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