Which of the following welding processes employs the highest welding temperature ?
A. Arc welding
B. Gas welding
C. Thermit welding
D. Resistance welding
Answer: Option D
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Thermit welding typically achieves higher temperatures compared to resistance welding. The thermite reaction in thermit welding can generate temperatures around 2500 degrees Celsius (4500 degrees Fahrenheit), making it one of the hottest welding processes. In contrast, resistance welding uses electrical resistance to produce heat, and while it can reach high temperatures, they generally fall below the extreme temperatures generated by thermit welding.
The correct answer should be C. Thermit welding