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MIG surfacing method for valve surface of air valve of medium-speed machine

A gas valve and valve surface technology, which is applied in welding equipment, welding accessories, arc welding equipment, etc., can solve the problems such as the large influence of the grain size of the surfacing transition layer, the reduced service life of the gas valve, and the shedding of the surfacing layer. Achieve the effects of improving wear resistance and corrosion resistance, increasing production efficiency and prolonging service life

Inactive Publication Date: 2017-04-19
CHONGQING YUEJIN MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the field of air valve manufacturing for medium-speed machines, the valve surface of the air valve is generally made of powder plasma surfacing welding of cobalt-based alloys, but it is easily affected by the amount of powder fed and arc power during the surfacing process, and unreasonable parameter settings will lead to surfacing welding. The layer falls off, the composition of the alloy layer in the fusion zone is uneven, and the heat of the plasma arc is too concentrated, which has a great influence on the grain size of the surfacing transition layer.
During use, the alloy layer tends to crack more easily and the base metal is easy to fall off, which will greatly reduce the service life of the valve, and the production efficiency is low and the operation is complicated

Method used

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  • MIG surfacing method for valve surface of air valve of medium-speed machine
  • MIG surfacing method for valve surface of air valve of medium-speed machine
  • MIG surfacing method for valve surface of air valve of medium-speed machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as figure 1 , figure 2 , image 3 as shown,

[0025] The MIG overlay welding method for the valve surface of the medium-speed machine includes the following steps:

[0026] 1) Machining the valve surface 1 of the gas valve to form a circle of welding grooves 2 on the valve surface 1 of the gas valve;

[0027] 2) Clean up the oil and water around the welding tank 2, preheat the gas valve to 440°C in a high-temperature furnace, keep it warm for 25 minutes and wait for welding;

[0028] 3) adopt the MIG overlay welding method to form an alloy layer 3 in the welding groove 2 of the valve face 1, and the welding wire used for the overlay welding is a cobalt-based alloy; the process parameters of overlay welding are:

[0029] ;

[0030] 4) Put the gas valve in a high-temperature furnace for post-heat treatment. The first-stage holding temperature is 660°C, and the holding time is 115 minutes. , and then the furnace temperature drops below 170°C, take out the a...

Embodiment 2

[0033] Such as figure 1 , figure 2 , image 3 as shown,

[0034] The MIG overlay welding method for the valve surface of the medium-speed machine includes the following steps:

[0035] 1) Machining the valve surface 1 of the gas valve to form a circle of welding grooves 2 on the valve surface 1 of the gas valve;

[0036] 2) Clean up the oil and moisture around the welding tank 2, preheat the gas valve to 450°C in a high temperature furnace, keep it warm for 30 minutes and wait for welding;

[0037] 3) adopt the MIG overlay welding method to form an alloy layer 3 in the welding groove 2 of the valve face 1, and the welding wire used for the overlay welding is a cobalt-based alloy; the process parameters of overlay welding are:

[0038] ;

[0039] 4) Put the gas valve in a high-temperature furnace for post-heat treatment. The first-stage holding temperature is 670°C, and the holding time is 120 minutes. , and then the furnace temperature drops below 170°C, take out the ...

Embodiment 3

[0042] Such as figure 1 , figure 2 , image 3 as shown,

[0043] The MIG overlay welding method for the valve surface of the medium-speed machine includes the following steps:

[0044] 1) Machining the valve surface 1 of the gas valve to form a circle of welding grooves 2 on the valve surface 1 of the gas valve;

[0045] 2) Clean up the oil and moisture around the welding tank 2, preheat the gas valve to 460°C in a high-temperature furnace, keep it warm for 35 minutes and wait for welding;

[0046] 3) adopt the MIG overlay welding method to form an alloy layer 3 in the welding groove 2 of the valve face 1, and the welding wire used for the overlay welding is a cobalt-based alloy; the process parameters of overlay welding are:

[0047] ;

[0048] 4) Put the gas valve in a high-temperature furnace for post-heat treatment. The first-stage holding temperature is 680°C, and the holding time is 125 minutes. , and then the furnace temperature drops below 170°C, take out the ...

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Abstract

The invention discloses an MIG surfacing method for a valve surface of an air valve of a medium-speed machine. The MIG surfacing method for the valve surface of the air valve of the medium-speed machine comprises the following steps: (1) machining the valve surface of the air valve, and forming a circle of welding slot in the valve surface of the air valve; (2) removing oil stain and water surrounding the welding slot, and preheating the air valve in a high-temperature furnace; (3) carrying out surfacing on the inside of the welding slot of the valve surface by using the MIG surfacing method to form an alloy layer; (4) placing the air valve in the high-temperature furnace and carrying out post-heat treatment; and (5) turning the alloy layer formed by surfacing so that the surface of the alloy layer is regular and meets requirements of finished products. By the MIG surfacing method, the problems that the surfacing layer of the valve surface of the air valve of the medium-speed machine drops and ingredients of an alloy layer of a fusion zone are uneven and the like are solved, the hardness of a sealing surface of the air valve is increased effectively, the wear resistance and the corrosion resistance of the sealing surface are improved, the process is simple, the production efficiency is improved, and the service life of the air valve is greatly prolonged.

Description

technical field [0001] The invention belongs to the field of material processing engineering, and in particular relates to a MIG overlay welding method for a medium-speed engine valve face. Background technique [0002] In the field of air valve manufacturing for medium-speed machines, the valve surface of the air valve is generally made of powder plasma surfacing welding of cobalt-based alloys, but it is easily affected by the amount of powder fed and arc power during the surfacing process, and unreasonable parameter settings will lead to surfacing welding. Layer shedding, uneven composition of the alloy layer in the fusion zone, and excessive concentration of plasma arc heat have a greater impact on the grain size of the surfacing transition layer. During use, the alloy layer tends to crack more easily and the base metal is easy to fall off, resulting in a greatly reduced service life of the valve, lower production efficiency and complicated operation. Contents of the in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04B23K9/235B23K9/32
CPCB23K9/044B23K9/235B23K9/32
Inventor 严中明丁满平张乐
Owner CHONGQING YUEJIN MACHINERY