Manufacturing And Production Technology
Two plates of the same metal having equal thickness are to be butt welded with electric arc. When the plate thickness changes, welding is achieved by

Changing the electrode size
Adjusting the current
Adjusting the duration of current
Changing the electrode coating

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Manufacturing And Production Technology
In ultrasonic machining, the metal is removed by

Direct contact of tool with the work
Using abrasive slurry between the tool and work
Maintaining an electrolyte between the work and tool in a very small gap between the two
Erosion caused by rapidly recurring spark discharges between the tool and work

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