Overlaying welding method of large area carbide alloy of workpiece wear layer

Abstract

The invention relates to a resurfacing welding method for a large-area hard alloy of an abrasion resistant layer of a workpiece, which comprises the following steps: 1) processing a steel substrate of a resurfacing welding workpiece; 2) resurfacing welding of a transition layer; 3) heat treatment for relieving stress; 4) cleaning and checking a surface to be welded; 5) welding a technical ring; 6) cladding by a heater, namely, adopting a track heater to clad the integral workpiece; 7) preheating and insulating, namely, heating the workpiece to be within a range of 300 +- 20 DEG C, and then performing resurfacing welding on the work piece after the work piece is insulated for 30 to 40 minutes; 8) resurfacing welding of a hard alloy layer; and 9) heat treatment after the welding. The method effectively controls generation of resurfacing welding cold cracks, thoroughly solves the problem of cold cracks during welding, provides favorable conditions for preventing the generation of the welding cold cracks, provides effective guarantee for quality of the hard alloy surface, and thoroughly solves the problem of difficult maintenance for surface defects of the hard alloy. The resurfacing welding layer has the advantages of good surface red hardness, corrosion resistance and heat resistance.

Description

technical field [0001] The invention relates to a surfacing welding process, in particular to a large-area wear-resistant layer-large-area cobalt-based hard alloy surfacing welding method. Background technique [0002] Cemented carbide surfacing is widely used in the sealing surface of high temperature and high pressure valves, the inner surface of shaft sleeve and inner sleeve of high pressure pump, and the cutting edge of chemical fiber equipment. These surfacing welding workpieces are regular and the size of the surfacing welding surface is small. Generally, after the overall heating in the heat treatment furnace to a predetermined temperature of 200-500 ° C, it is taken out for thermal insulation surfacing. When the temperature drops slightly, continue to put the workpiece into the heat treatment furnace and heat it. Take it out at the predetermined temperature and re-surfacing welding, repeat this back and forth until the surfacing operation is completed, and finally ca...

AI Technical Summary

Problems solved by technology

However, the existing surfacing welding process method cannot solve the above problems well, especially when the workpiece size is large and the workpiece surface with irregular shape is to carry out large-area multi-layer cobalt-based hard alloy layer surfacing welding, it is more difficult to do it well. solve the above problems

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