Investigation of long-life cathode EB guns for welding of turbochargers

Investigation of long-life cathode EB guns for welding of turbochargers

 

This paper describes a laser heated cathode gun design which uses a lanthanum hexaboride button in a diode configuration. Beam currents up to 40 mA at – 60 kV were generated by using laser powers in the range of 19 to 83 W, which fulfils the requirements for welding of turbochargers. Beam spot sizes were measured to be less than to 0.15 mm at 190 mm working distance across the current range from a 0.75 mm diameter cathode design.

 

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