Research On The Plasma Transferred-Arc Wire-Powder Surfacing Equipment

Plasma arc powder surfacing technology is a newer technique in the field ofoverlaying welding ,with the characteristic shallow penetration ,lower-rate of dilutionand higher deposition efficiency . the utilization ratio of alloy powder is very low .thealloy powder mostly belongs to the precious metals which prices are moreexpensive.therefore the cost of build-up welding cost was greatly enhanced.comparingto the alloy powder , the price of wire is much lower than the alloy powder . but thedeposition efficiency are much higher,the research on the plasma arc powder wasmore active in recent years ,however ,the study of plasma arc surfacing on automaticwire feeder was relatively much less.The essay focus on the technique of build-up welding,the technique introducesto replace the alloy powder with common wire.the obiect is to reduce the cost ofbuild-up weldingunder the premise of high quality piles layer.finally realize build-upwelding feeding with wire orwire mixed powder at the same machine.on this issue,we did feasibility experiment on the LPC surfacing machine,the reasonableparameters range is defined using orthogonal design.the structure of plasma torch wirefeed circuit as well as wire feeding device were designed.In this paper , following research results are obtained:1,Do the experiment at LPCsurfacing machine,analyses the impact ofparameters to the layer quality,and then design orthogonal experiments,finallydetermine the optimum technical parameters of plasma arc wire surfacing .2 In order to feed wire at one machine,we add wire feed circuit in controlcabinet,design main components parameters of wire feed circuit.and reconstrucewire feeding device.3 design and reconstruct the plasma torch,the design focus on the channel ofpowder and wire .the rebuild of cooling system .how to elect materimals of theplasma torch.