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

A technology of cemented carbide and wear-resistant layer, which is applied in the field of large-area wear-resistant layer of workpiece—large-area cobalt-based cemented carbide surfacing field, which can solve problems such as large workpiece size, ensure quality, reduce welding stress, and solve Discontinuous effect of preheat temperature and welding

Active Publication Date: 2009-05-20
NANJING BAOSE
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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 wit

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

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Embodiment Construction

[0034] see figure 1 , the lower part of a piece of equipment (Φ1300 / Φ219×1000mm) needs to be surfacing with a 5mm thick wear-resistant, corrosion-resistant, heat-resistant and oxidation-resistant cobalt-based cemented carbide layer 4 (Stillite6, ECoCr-A).

[0035] Carbide surfacing adopts manual electrode arc welding (SMAW) welding method, the material of the base steel part 6 is 16MnR, the transition layer surfacing material is E309Mo (A312) with a specification of Φ4.0, and the hard alloy surface layer surfacing material Stillite6 (EcoCr-A), the specification is Φ4.0, the transition layer 5 is surfacing with two layers, and the surface layer 4 is surfacing with two layers. The specific implementation measures are as follows:

[0036] 1) Processing of the steel base of the surfacing workpiece: the base of the surfacing workpiece is made of two pieces of tailor welding, and each piece is formed by pressing. The ellipticity of the large and small mouths of the workpiece should...

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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...

Claims

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Application Information

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IPC IPC(8): B23K9/04B23K9/235B23K9/095C21D1/30
Inventor 杜永勤樊云博詹典斌
Owner NANJING BAOSE
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