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What is the maximum frequency used in ultrasonic welding?

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in Casting-Forming-Welding II by (119k points)
What is the maximum frequency used in ultrasonic welding?

(a) 30,000 Hz

(b) 40,000 Hz

(c) 50,000 Hz

(d) 60,000 Hz

I got this question during a job interview.

The query is from Solid State Welding topic in division Welding and Related Processes of Casting-Forming-Welding II

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Right choice is (d) 60,000 Hz

To explain: None.

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