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Self-protecting open-arc surfacing method for high-chromium alloy with multi-layer composite powder particles

A multi-layer composite and high-chromium alloy technology, which is applied in arc welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of long feedback adjustment and research time, cumbersome maintenance, and expensive rolling forming equipment, etc. High efficiency, reduced burning loss rate, and the effect of lowering the melting temperature

Active Publication Date: 2019-02-22
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flux-cored welding wire is wrapped by a low-carbon plastic steel strip, which is closed into an overlapping "O-shaped" cross-sectional structure, and then rolled and reduced in diameter. By changing the composition ratio of the powder components, a series of stacks with different components are prepared. Welding alloy, but its main disadvantage is that the rolling forming equipment is more expensive and the maintenance is more cumbersome
In addition, when the above-mentioned welding materials are required to change the composition and properties of the surfacing alloy, the time for feedback adjustment and research is too long, which is gradually incompatible with the current requirements of diversification of surfacing alloy composition and rapid supply. It is expected to develop new surfacing materials

Method used

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  • Self-protecting open-arc surfacing method for high-chromium alloy with multi-layer composite powder particles
  • Self-protecting open-arc surfacing method for high-chromium alloy with multi-layer composite powder particles
  • Self-protecting open-arc surfacing method for high-chromium alloy with multi-layer composite powder particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Pass the powder components of high-carbon ferrochromium, ferrovanadium, ferrosilicon, ferroboron, flake graphite, and reduced iron powder through a 60-mesh sieve, and pass through a 300-mesh sieve for ultra-fine aluminum powder and ultra-fine graphite. According to the powder component composition requirements of the inner layer, middle layer and outer layer of the multi-layer composite powder, pour the constituent powders of each layer into three separate containers , stir well to make it evenly mixed to form the corresponding mixed powder of each layer;

[0042] The powder composition ratio (weight percentage) of the multilayer composite powder is: high-carbon ferrochromium 54%, vanadium iron 4%; flake graphite 14.5%, boron iron 11%; ferrosilicon 3.5%, superfine Aluminum powder 1.5%, superfine graphite 3%, reduced iron powder 8.5%;

[0043] Among them, high-carbon ferrochromium and ferrovanadium are composed of the inner layer powder components of multilayer composit...

Embodiment 2

[0058] Pass the powder components of high-carbon ferrochromium, ferrovanadium, ferrosilicon, ferroboron, flake graphite, and reduced iron powder through a 60-mesh sieve, and pass through a 300-mesh sieve for ultra-fine aluminum powder and ultra-fine graphite. According to the powder component composition requirements of the inner layer, middle layer and outer layer of the multi-layer composite powder, pour the constituent powders of each layer into three separate containers , stir well to make it evenly mixed to form the corresponding mixed powder of each layer;

[0059] The powder composition ratio (weight percentage) of the multilayer composite powder is: 60% of high-carbon ferrochrome, 2% of ferro-vanadium; 12% of flake graphite, 11% of ferro-boron; 3% of ferrosilicon, superfine Aluminum powder 1%, superfine graphite 3%, reduced iron powder 8%;

[0060] Among them, high-carbon ferrochromium and ferrovanadium are composed of the inner layer powder components of multilayer c...

Embodiment 3

[0068] Pass the powder components of high-carbon ferrochrome, ferro-vanadium, ferrosilicon, ferro-boron, flake graphite, and reduced iron powder through a 60-mesh sieve, and sieve the ultra-fine aluminum powder and ultra-fine graphite through a 300-mesh sieve. The powder composition ratio of the composite powder is weighed, and according to the powder composition requirements of the inner layer, middle layer and outer layer of the multi-layer composite powder, the composition powder of each layer is poured into three separate In the container, fully stir to make it evenly mixed to form the corresponding mixed powder of each layer;

[0069] The powder composition ratio (weight percentage) of the multilayer composite powder is: 52% of high-carbon ferrochrome, 12% of vanadium iron; 15% of flake graphite, 10% of boron iron; 2% of ferrosilicon, superfine Aluminum powder 2%, superfine graphite 2%, reduced iron powder 5%;

[0070] Among them, high-carbon ferrochromium and ferrovanad...

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Abstract

The invention adopts a self-protecting open-arc surfacing method for high-chromium alloy with multi-layer composite powder particles. The multi-layer composite powder particles which are formed by steps of all layers of powder mixing, inner layer bonding, intermediate layer bonding, outer layer bonding, sintering and other steps of all powder compositions and are in specific particle size and an H08A solid welding wire are used as surfacing materials, self-protecting open-arc welding is conducted, thus, molten drops of the composite powder particles and molten drops of the H08A solid welding wire are fused into an integrated molten pool, and a high-chromium alloy structure with primary M7C3 phases as main abrasion-resistant phases. The method is simple in preparation process and high in deposition efficiency, the prepared high-chromium alloy high good abrasion resistance, and completely meets the practical requirements, and the method can be used for part self-protection open-arc surfacing abrasion layers under abraded conditions of abrasive particles.

Description

technical field [0001] The invention belongs to the technical field of wear-resistant surfacing welding, and in particular relates to a method for multilayer composite powder and self-protective open arc surfacing welding of high chromium alloys. Background technique [0002] The wear resistance of the alloy is related to the size, shape, distribution, quantity and even orientation of the carbides contained in the alloy. Among them, the primary carbide particles are the main wear-resistant phase because of their large size, which can effectively resist abrasive wear. Abrasion resistance plays a major role. [0003] Among the wear-resistant alloys, high-chromium and high-boron alloys are widely used. High chromium alloy because of its large amount of M 7 C 3 Phase (1300~1800HV) and M 23 C 6 Phase (1140HV) is widely used in the manufacture of wear-resistant parts of mechanical parts, such as cement grinding rollers, liners and concrete delivery pipes; It is easy to form ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04B23K9/16
CPCB23K9/04B23K9/16
Inventor 龚建勋姚惠文程诗尧马蓦
Owner XIANGTAN UNIV
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