High-chromium cast iron wear-resistant coating selective surfacing method and device

Abstract

The invention discloses a high-chromium cast iron wear-resistant coating selective surfacing method and device. The method comprises the steps that a to-be-welded base metal is placed on the upper surface of a copper pipe of a circulating water cooling device, wherein the circulating water cooling device comprises a copper pipe cooling device and a cooling circulating system, the cooling circulating system is provided with a water outlet and a water inlet, and the two ends of the copper pipe respectively communicate with the water outlet and the water inlet of the cooling circulating system; the circulating water cooling device is started, so that cooling water flows between the copper pipe and the circulating water cooling device; the to-be-welded base metal is placed on the copper pipe,the to-be-welded base metal is taken as a matrix, and surfacing of high-chromium cast iron wear-resistant coating is carried out on the upper surface of the to-be-welded base metal; and in the surfacing process, the to-be-welded base metal is in direct contact with the cooling circulating system, and the cooling speed of a surfacing layer and the heat dissipation direction during cooling in the surfacing process of the high-chromium cast iron are controlled so as to control the growth direction of carbide, so that a main wear-resistant phase in the high-chromium cast iron wear-resistant coating, namely the carbide, grows vertical to the surface of the base metal. The method and the device have the advantages of being good in machining effect, and high in machining efficiency.

Description

technical field [0001] The invention relates to a method and a device for surfacing a high-chromium cast iron wear-resistant coating based on a circulating water cooling device, and belongs to the technical field of welding technology. Background technique [0002] High chromium cast iron is a widely used wear-resistant surfacing material. The surfacing welding method is used to surfacing high chromium cast iron wear-resistant alloy on the steel plate with good toughness, which can not only ensure the strength and toughness of the material, but also ensure the wear resistance of the material surface. High chromium cast iron has good wear resistance, mainly because it contains high hardness (Cr, Fe) 7 C 3 carbide. [0003] In the actual abrasive wear process, there are two main forms of carbide wear failure: peeling and cutting. Therefore, if the carbide crystal grows perpendicular to the surface of the matrix metal, its cross-section is a wear-resistant surface. During t...

AI Technical Summary

Problems solved by technology

When the workpiece is working, carbide crystals grow parallel to the surface of the base metal, and serious stress concentration is easily formed around it, so that the carbide is easy to break away from the base during the wear process, resulting in a decrease in wear performance

Therefore, the wear-resistant workpieces of existing overlay welding high chromium cast iron have poor performance and short service life

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