Welding requires a high-temperature flame to melt and fuse metals. The combustion of acetylene (C₂H₂) with oxygen (O₂) produces an oxy-acetylene flame, which can reach temperatures of around 3500 °C, making it suitable for welding. Other fuel gases like LPG and methane produce lower temperatures when burned with oxygen. Burning acetylene in nitrogen would not sustain combustion as nitrogen is inert and would not provide the necessary oxidant.
To weld metals together, high temperature is required. Such a high temperature is obtained by burning:
Asked in UPSC NDA 2 2015 · Topic: Hydrocarbons (Alkynes: Preparation, Physical and Chemical Properties)
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