Abstract The invention relates to a surfacing process for metallic parts by applying to them layers constituted of special alloys, the component being melted in a plasma jet. In order to form a weld surfacing layer, a trough shaped metallic sheet strip receives by free fall powder or granular alloying materials, the strip being continuously pushed forward into the melting zone of a plasma jet, which simultaneously melts the basic material surface and the metallic strip and the powder or grains deposited on it, the ratio between the metal quantities resulting from the strip and from the powder or grains respectively, being adjusted by varying the trough shape and width. For obtaining weld surfacing layers with required geometrical parameters and chemical composition which can be adjusted within large limits, a mechanized outfit is used, consisting of a carriage on which are placed a support for the strip coil, a rotating column, a shaping device driven by an electric motor, a container with shutter for the storage of alloying powders or grains, an oscillating mechanism driven by an electric motor provided with two adjustment arms, three handles for the control of the shaping machine, container and plasma torch and a runway on which the carriage is shifted. Besides these exist electric current, protection gas and cooling water feeding units and a control panel.
A process for the deposition of a weldment containing a powder or granular material upon a metallic body, comprising the steps of: a. melting a surface portion of said body by training a plasma jet thereon; b. forming a fully open channel by bending upwardly marginal portions of a continuous strip of weld material and continuously feeding said channel toward said plasma jet for melting of the channel by said jet; and c. cascading said powder or granular material into the open channel and entraining it in said open channel into the region of said plasma jet without closing said channel thereby controlling the proportions of the channel strip material and said powder or granular material incorporated in said weldment substantially only by the quantity of said powder or granular material freely retained in the open channel.
Claim 2
Dependent Claim
137 words
A process for the deposition of a weldment containing a powder or granular material upon a metallic body, comprising the steps of: a. melting a surface portion of said body by training a plasma jet thereon; b. forming a fully open channel by bending upwardly marginal portions of a continuous strip of weld material and continuously feeding said channel toward said plasma jet for melting of the channel by said jet; and c. cascading said powder or granular material into the open channel and entraining it in said open channel into the region of said plasma jet without closing said channel thereby controlling the proportions of the channel strip material and said powder or granular material incorporated in said weldment substantially only by the quantity of said powder or granular material freely retained in the open channel.