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In which of the following welding only fusion welding takes place?

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In which of the following welding only fusion welding takes place?

(a) Seam welding

(b) Flash butt welding

(c) Spot welding

(d) Arc welding

I had been asked this question in exam.

Question is from Welded Joints topic in portion Computer Aided Drawing, Riveted & Welded Joints of Engineering Drawing

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Correct answer is (d) Arc welding

The explanation is: Fusion welding is a process of welding by local fusion with or without the use of a filler metal. The most commonly used fusion welding processes are gas welding and arc welding. The flame temperature varies from 2600 to 3200 degrees depends on fuel gases.

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