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A spot welding method

A spot welding and solder technology, applied in the field of spot welding, can solve the problems of cemented carbide cracks, affecting the grinding process of hard surface materials, cemented carbide delamination cracks, etc., so as to prolong the service life, improve the quality of workpieces, and release local effect of stress

Active Publication Date: 2017-08-25
SEED TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the large heat is easy to decarburize, become brittle, and crack the surface of the cemented carbide block during the welding process; moreover, after the cemented carbide block is fixed to the metal substrate, the welding layer will be lost in the subsequent surfacing or spray welding process. A large stress is generated on the cemented carbide block. When the stress exceeds the fracture toughness of the cemented carbide block, it will cause layered cracks in the cemented carbide; especially when spot welding is required for the surface of the inner hole of the metal matrix, due to the inner hole The stress generated on the surface during the welding process is manifested as tensile stress, which is very prone to cracks, and is larger than the stress generated during the welding process of the outer wall, making it easier for the cemented carbide to crack or fall off
[0004] The above problems will seriously affect the subsequent grinding of hard surface materials, resulting in cracks in the hard surface layer, and problems such as hard alloy blocks falling off and edges falling off.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0065] Cover the outer surface of the cylindrical 42CrMo substrate with a size of Φ120mm×Φ90mm×50mm with a steel mesh, the thickness of the steel mesh is 0.2mm, and the mesh is 1mm, and the steel mesh is bent so that it can completely cover the 42CrMo substrate. outer circular surface;

[0066] Place the mold with the thickness of asbestos paper material on the surface of the steel mesh as 1.5mm, and the shape and arrangement of the holes on the mold are as follows: figure 1 As shown, the length of the hole in the mold is 13mm, and the width is 5mm, and the mold is bent so that its shape fits with the outer circular surface of the 42CrMo substrate;

[0067] Place a copper sheet with a thickness of 0.1mm in each hole in the mold, and place a 13mm × 5mm rectangular hard disk with a thickness of 3mm on the YG10 model provided by Zhuzhou Xidi Cemented Carbide Technology Co., Ltd. Cemented carbide sheet, the coverage rate of the hard alloy sheet on the outer surface of the 42CrMo ...

Embodiment 2

[0071] Cover the surface of the inner hole of the cylindrical 42CrMo substrate with a size of Φ120mm×Φ90mm×50mm. The thickness of the steel mesh is 0.2mm and the mesh is 1mm. The steel mesh is bent so that it can completely cover the 42CrMo substrate. inner hole surface;

[0072] Place the mold with the thickness of asbestos paper material on the surface of the steel mesh as 1.5mm, and the shape and arrangement of the holes on the mold are as follows: figure 1 As shown, the length of the hole in the mold is 13mm, and the width is 5mm, and the mold is bent so that its shape fits the surface of the inner hole of the 42CrMo matrix;

[0073] Place the red copper sheet that thickness is 0.1mm in each hole in described mould, place the cemented carbide sheet that the YG10 model that thickness is 5mm provides on each red copper sheet, so The size of the hard alloy sheet is 13mm * 5mm, and the coverage rate of the hard alloy sheet on the surface of the inner hole of the 42CrMo matrix...

Embodiment 3

[0077] The upper surface (annular plane) of the cylindrical 42CrMo substrate with a size of Φ120mm×Φ90mm×50mm is covered with a ring-shaped steel mesh. The thickness of the steel mesh is 0.2mm and the mesh is 1mm. The ring-shaped steel mesh can completely cover The upper surface of the 42CrMo substrate;

[0078] Place the thickness of the asbestos paper material on the surface of the steel mesh as a ring mold of 1.5mm, the shape and arrangement of the holes on the mold are as follows figure 1 As shown, the length of the hole in the mold is 13mm, and the width is 5mm, and the shape of the annular mold is attached to the upper surface of the 42CrMo substrate;

[0079] Place a copper sheet with a thickness of 0.1mm in each hole in the mold, and place a 13mm×5mm rectangular hard disk of the YG10 model with a thickness of 5mm provided by Zhuzhou Xidi Cemented Carbide Technology Co., Ltd. Carbide alloy sheet, the coverage rate of described cemented carbide sheet on the 42CrMo subst...

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Abstract

The invention provides a spot welding method. The spot welding method comprises the following steps: providing workpiece, in which the workpiece comprises a metal substrate, a metal wire mesh arranged on the surface of the metal substrate, a plurality of welding flux slices distributed on the metal wire mesh and hard alloy slices arranged on the surface of each welding flux slice; and carrying out spot welding of the metal substrate, the metal wire mesh and the hard alloy slices in the workpiece through the welding flux slices. The spot welding method is capable of firmly welding the hard alloy slices to the metal substrate through the metal wire mesh without high current; the metal wire mesh is adopted in the spot welding process; welding layers can apply stress to the hard alloy slices in the welding process; the metal wire mesh and the hard alloy slices are loosened to effectively release the stress, thereby preventing the hard alloy slices from flawing and falling; the spot welding method is especially applicable to the inner-hole-shaped metal substrate and is capable of preventing the inner-hole-shaped metal substrate from flawing or preventing the hard alloys from falling.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a spot welding method. Background technique [0002] Hard surface technology is to use well-known methods such as thermal spraying, spray welding, surfacing and sintering to coat high-hard materials on the stress-bearing surface of metal parts to make metal parts wear-resistant, impact-resistant and corrosion-resistant. Hard facing technology is an important technology to improve the service life of mechanical parts. It has been widely promoted and applied in metallurgy, machinery, electric power, petroleum, chemical industry, aerospace, aviation and other fields. For example, TC bearings (tungsten carbide diameter bearings), stabilizers, etc. [0003] At present, the main method of preparing hard surface materials is to fix the cemented carbide block on the surface of the metal substrate, use spray welding, sintering or surfacing welding, and use wear-resistant additives or so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K11/11
CPCB23K11/11
Inventor 陈灿坤徐跃华曹志华
Owner SEED TECH CORP LTD