초록 ▼

A metallic coating is applied to threaded sections on the ends of plastic pipes that are to be forcefully screwed together. Droplets of a metal or metallic alloy are sprayed against the threaded sections at a high velocity, at a selectable angle of impingement, and within a zone of impingement. Duri

A metallic coating is applied to threaded sections on the ends of plastic pipes that are to be forcefully screwed together. Droplets of a metal or metallic alloy are sprayed against the threaded sections at a high velocity, at a selectable angle of impingement, and within a zone of impingement. During the spraying, the pipe is turned and also moved relative to the zone of impingement in a longitudinal direction of the pipe. The resulting metallic coating on the pipes, beneficially, is porous so that such coating may contain lubricant, for instance. The apparatus for carrying out the spraying method includes a rotable pipe-holding device, and an arc metal spray unit having a nozzle whose direction of emission is adjustable.

대표청구항 ▼

A method of applying a metallic coating to the threaded sections on the ends of plastic pipes that are to be forcefully screwed together, comprising the steps of: spraying droplets of one of a metal and metal-alloy against the threaded sections, said spraying being done at a high velocity, at an ang

A method of applying a metallic coating to the threaded sections on the ends of plastic pipes that are to be forcefully screwed together, comprising the steps of: spraying droplets of one of a metal and metal-alloy against the threaded sections, said spraying being done at a high velocity, at an angle of impingement and within a zone of impingement; and during the spraying, turning the pipe and also moving the pipe relative to said zone of impingement along a longitudinal axis of the pipe.