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Novel tubular hard surfacing material

A surfacing material and hard surface technology, which is applied in the direction of welding/cutting medium/material, welding medium, welding equipment, etc., can solve the problems of the mismatch between the strength and toughness of the base metal, and achieve improved surfacing welding processability, optimized strength, Apply promising effects

Active Publication Date: 2011-08-10
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a tubular hardfacing surfacing material, which aims to effectively solve the problem of mismatch between the strength and toughness of the base metal and improve the wear resistance of the surfacing layer

Method used

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Experimental program
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Effect test

Embodiment 1

[0032] The tubular welding rod filler powder is composed of: 75% spherical cemented carbide particles with a particle size of 14-40 mesh; 15% surface-treated cast tungsten carbide particles with a particle size of 40-100 mesh; 5% spherical cast tungsten carbide particles Granules, with a particle size of 80-325 mesh; 2.8% of 200-mesh SiMn powder; 0.2% of 200-mesh phenolic resin powder; 2% of 200-mesh Nb alloy powder. The tube skin is low carbon steel H08A, the tube diameter is 4mm, and the tube skin thickness is 0.4mm. The filler powder accounts for 60% of the weight of the electrode.

[0033] After surfacing, the metallographic phase of the surfacing layer is as follows: figure 1 shown. In this embodiment, the apparent dimension hardness of spherical cemented carbide particles in the surfacing layer is: HV 0.1 1366, the surface treated cast tungsten carbide particles have a microhardness of: HV 0.1 2993, the microhardness of spherical cast tungsten carbide particles is:...

Embodiment 2

[0035] The tubular welding rod filler powder is composed of 60% spherical cemented carbide particles with a particle size of 14-40 mesh; 17.3% surface-treated cast tungsten carbide particles with a particle size of 40-100 mesh; 20% spherical cast tungsten carbide particles Particles, the particle size is 80-325 mesh; 2% 200 mesh SiMn powder; 0.6% 200 mesh phenolic resin powder; 0.1% 200 mesh Nb alloy powder. The tube skin is low carbon steel H08A, the tube diameter is 4mm, and the tube skin thickness is 0.2mm. The filler powder accounts for 80% of the weight of the electrode.

[0036] In this embodiment, the apparent dimension hardness of spherical cemented carbide particles in the surfacing layer is: HV 0.1 1341, the surface treated cast tungsten carbide particles have a microhardness of: HV 0.1 2971, the microhardness of spherical cast tungsten carbide particles is: HV 0.13080, the microhardness of the base metal is: HV 0.05 786, metal wet sand wear test shows that th...

Embodiment 3

[0038] The tubular welding rod filler powder is composed of 55% spherical sintered carbide particles with a particle size of 14-40 mesh; 25% surface-treated tungsten carbide particles with a particle size of 40-100 mesh; 13% spherical cast tungsten carbide Particles, the particle size is 80-325 mesh; 6% 200 mesh SiMn powder; 0.4% 200 mesh phenolic resin powder; 0.6% 200 mesh Nb alloy powder. The tube skin is low carbon steel H08A, the tube diameter is 4mm, and the tube skin thickness is 0.3mm. The filler powder accounts for 70% of the weight of the electrode.

[0039] In this embodiment, the apparent dimension hardness of spherical cemented carbide particles in the surfacing layer is: HV 0.1 1368, the surface treated cast tungsten carbide particles have a microhardness of: HV 0.1 2897, the microhardness of spherical cast tungsten carbide particles is: HV 0.1 3015, the microhardness of the base metal is: HV 0.05 807, metal wet sand wear test shows that the wear resistan...

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Abstract

The invention provides a tubular hard-surface resurfacing welding material which includes a tubular skin and filling powder. The novel tubular hard surface resurfacing welding material includes the components as follows: 20 to 40 percent of steel as well as 60 to 80 percent of filling powder; the components of the filling powder is as follows: 35 to 75 percent of spherical hard alloy grains, 15 to 40 percent of carbonated casting tungsten grains, the surface of which are processed, 5 to 20 percent of spherical carbonated casting tungsten grains, 2 to 6 percent of SiMn alloy powder, 0.2 to 0.6 percent of resin powder as well as 0.1 to 2 percent of metal Nb. The spherical hard alloy grains, the carbonated casting tungsten grains and the spherical carbonated casting tungsten grains with thermal stability are adopted, thus remarkably improving the wear resistance and the impact resistance of a resurfacing welding layer; less Nb element is added to improve the resurfacing welding manufacturability, thereby improving the intensity and the toughness of a substrate metal, enhancing the anti-impact capacity of the resurfacing welding layer and the fixing capacity to the hard grains as well as prolonging the service life of the resurfacing welding layer. The tubular hard surface resurfacing welding material is widely applied to the wear-resistance reinforcement on the working surfaces like the gear surface of a steel gear roller bit, a back cone, a palm tip and the other engineering tools.

Description

technical field [0001] The invention relates to a tubular hard surface surfacing material, which is used for wear-resisting strengthening of the tooth surface, back cone, palm tip and other engineering tool working surfaces of a steel gear cone bit. Background technique [0002] In the process of oil drilling, the working environment is very harsh, and the machine parts are severely worn. Due to the special working conditions, a layer of wear-resistant materials must be surfacing on the tooth surface, back cone and palm tip of the gear steel tooth drill bit to avoid premature wear and failure of the drill bit. . Tungsten carbide is one of the materials with the highest hardness and the best wear resistance except diamond used in industry. The traditional process of overlaying hard surface materials of gear tooth drill bits is to use tube-packed granular broken cast tungsten carbide electrodes, and use oxygen-acetylene flame overlay welding, but purely use cast tungsten carb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/22
Inventor 徐纯芳余立新廖江雄
Owner SHAREATE TOOLS
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