Process for repairing and reinforcing surfaces of agricultural machinery components and parts by plasma spray welding

A technology of agricultural machinery and plasma, applied in metal material coating process, fusion spraying, coating, etc., can solve problems such as large surface roughness and large residual stress, achieve low dilution rate, prolong mechanical properties, and improve service life The effect of performance and service life

Inactive Publication Date: 2013-09-04
华芳雄
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the repair of agricultural machinery parts, electric welding, argon arc welding and other processes are generally used for surface repair and strengthe

Method used

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  • Process for repairing and reinforcing surfaces of agricultural machinery components and parts by plasma spray welding
  • Process for repairing and reinforcing surfaces of agricultural machinery components and parts by plasma spray welding

Examples

Experimental program
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Effect test

Embodiment 1

[0040] In this embodiment, the ion arc is used as the heat source to spray and melt the specific alloy powder for welding, and the specific steps are as follows:

[0041] (1) Select two alloy powders of Ni60 and WC with a specific particle size of 30-40 μm, take 300 grams of each of these two powders at a mass ratio of 1:1, and then mix them evenly with a ball mill;

[0042] (2) Put the mixed alloy powder into the powder feeder of the plasma arc welding machine, and then turn on the power of the plasma arc welding machine and adjust the arc welding current to 80A, voltage 20V, ion gas flow rate 0.6L / min, powder feeding rate 30g / min and coating distance 4mm, to achieve micro-melting on the metal surface, low dilution rate, no change in the structure of the metal material, and small harmful residual stress in the coating. No further processing is required after surfacing.

[0043] (3) Turn on the arc welding switch, perform plasma coating along the surface of the modified part,...

Embodiment 2

[0055] In this embodiment, the ion arc is used as the heat source to spray and melt the specific alloy powder for welding, and the specific steps are as follows:

[0056] (1) Select two alloy powders of Ni60 and WC with a specific particle size of 30-40 μm, take 200 grams each of these two powders at a mass ratio of 1:1, and then mix them evenly with a ball mill;

[0057] (2) Put the mixed alloy powder into the powder feeder of the plasma arc welding machine, and then turn on the power of the plasma arc welding machine and adjust the arc welding current to 90A, voltage 18V, ion gas flow rate 0.5L / min, powder feeding rate 35g / min and coating distance 5mm, to achieve micro-melting on the metal surface, low dilution rate, no change in the structure of the metal material, and small harmful residual stress in the coating. No further processing is required after surfacing.

[0058] (3) Turn on the arc welding switch, perform plasma coating along the surface of the modified part, an...

Embodiment 3

[0067] In this embodiment, the ion arc is used as the heat source to spray and melt the specific alloy powder for welding, and the specific steps are as follows:

[0068] (1) Select two alloy powders of Ni60 and WC with a specific particle size of 30-40 μm, take 350 grams of each of these two powders at a mass ratio of 1:1, and then mix them evenly with a ball mill;

[0069](2) Put the mixed alloy powder into the powder feeder of the plasma arc welding machine, and then turn on the power of the plasma arc welding machine and adjust the arc welding current to 90A, voltage 15V, ion gas flow rate 0.8L / min, powder feeding rate 25g / min and coating distance 3mm, to achieve micro-melting on the metal surface, low dilution rate, no change in the structure of the metal material, and small harmful residual stress in the coating. No further processing is required after surfacing.

[0070] (3) Turn on the arc welding switch, perform plasma coating along the surface of the modified part, ...

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Abstract

The invention belongs to the field of surface reinforcement of agricultural machinery components and parts, and specifically relates to a process for repairing and reinforcing surfaces of the agricultural machinery components and parts by plasma spray welding. A plasma spray welding process is employed to perform plasma spray welding treatment on the surfaces of the agricultural machinery components and parts without reducing performances such as harness, wear resistance and the like of the surfaces of the components and parts, so as to achieve an object that an agricultural machine has original mechanical properties and prolonged service life of the agricultural machinery. The plasma arc is used as a heat source to spray specific alloy powder for welding; the alloy powder is melt and coated on the surface of gold to form an alloy metal coating directly. The metal coating coated by the specific powder has excellent properties of no crack, high hardness, wear resistance, corrosion resistance, etc. By accurately controlling a welding penetration force during the coating process, microfused dilution rate on the surface of the metal is low without changing metal structures of the components and parts, no harmful residual stress is produced and the process is suitable for repairing the agricultural machinery components and parts.

Description

technical field [0001] The invention belongs to the field of surface strengthening of agricultural machinery parts, and specifically relates to a process for repairing and strengthening the surface of agricultural machinery parts by using a plasma spray welding process. Background technique [0002] In the promotion of agricultural machinery application fields and the current widespread use of agricultural machinery remanufacturing, it is often encountered that some metal parts are often worn unevenly during use, and some parts are only severely worn, while other parts are still good or not. In the case of slight wear and tear, if the structural strength of the metal parts permits, determine the technical condition of the parts, take necessary repair process measures, and choose a reasonable repair method. The part with severe wear can be repaired restoratively or the part that is prone to serious wear can be correctly judged in advance to increase the local repair. Wear-res...

Claims

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Application Information

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IPC IPC(8): C23C4/04
Inventor 华芳雄
Owner 华芳雄
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