This welding equipment consists of hollow cathode welding torch, vacuum system, welding power source, gas flow control unit and compact control device.

This paper designs a new kind of nozzle used for laser welding of zinc-coated steels with metal powder and studies the better modality of shielding gas and the powder beam with schlieren device.

When objects require spray coating or spray welding, the user can close the high-pressure oxygen gas valve and open the powder feeding valve (4), so the hot spray device can work.