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Which of the following methods cannot be used for welding carbon steel?

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in Casting-Forming-Welding II by (119k points)
Which of the following methods cannot be used for welding carbon steel?

(a) Arc welding

(b) Gas welding

(c) Ultrasonic welding

(d) Forge welding

This question was posed to me in an interview for internship.

My question is taken from Welding of Various Metals in chapter Welding and Related Processes of Casting-Forming-Welding II

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Right choice is (c) Ultrasonic welding

Easy explanation: For the welding of carbon steel material, one may use the arc welding method. To gas weld carbon steel is also a feasible option and carbon steels can be treated using forge welding also, but it cannot be welded using ultrasonic welding.

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