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Dissimilar material composite welding method

A technology of composite welding and dissimilar materials, applied in welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve the problems of difficulty in crystallization and element diffusion, inability to obtain high-strength joints, and reduced joint strength, reducing the interface effect of temperature difference, final reliable connection, and improved solderability

Active Publication Date: 2017-05-31
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the temperature of the welding surface is not enough to form a sufficient heat-deformed metal layer, recrystallization and element diffusion are difficult to proceed, and high-strength joints cannot be obtained
If the interface heat input is increased to obtain a sufficient deformed metal layer, the welding interface will cause brittle phases to form due to poor mutual solubility between materials, and the temperature will increase, reducing the joint strength.
In addition, coupled with the large thermal stress at the interface, it is difficult to obtain good quality joints by direct friction welding to weld these materials with large differences in melting point.

Method used

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  • Dissimilar material composite welding method

Examples

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Embodiment 1

[0101] Embodiment 1: In this embodiment: the part a to be welded is made of steel, the part c to be welded is made of a TiAl-based alloy, and the intermediate transition layer: the part b to be welded is made of a nickel-based alloy; the pressing rod is graphite Great.

[0102] The method for composite welding of dissimilar materials in this embodiment includes the following steps:

[0103] (1) Cleaning before welding: Grinding with metallographic sandpaper, ultrasonically cleaning the welding surface of the piece to be welded a1, the welding surface of the piece to be welded b2 and the surface of the piece to be welded c3;

[0104] (2) Clamping of the rotating end: Put the ejector rod 13 of the rotating end into the rotating clamping end, adjust the length of the ejector rod 13 of the rotating end to make it close to the step of the inner hole of the main shaft of the rotating end, and then make the non-welding surface of the workpiece a1 to be welded close Rotate the push r...

Embodiment 2

[0114] Embodiment 2: In this embodiment: the part a to be welded is made of 20 steel, the part c to be welded is made of TC4 titanium alloy, and the intermediate transition layer: the part b to be welded (thickness of the solid part is 3mm) is made of T2 red copper ; The top pressure rod is a graphite rod.

[0115] (4) Installation and preloading of the intermediate transition layer: place the piece to be welded b2 close to the inner boss of the 11 heater, slide the 10 intermediate support frame axially, so that the welding surface of the piece to be welded a and the piece to be welded Contact the front end of b2, then move the welding machine slide table, apply a top-tightening pre-pressure of 1.5MPa, make the graphite rod 7 contact with the piece to be welded b2, and push the piece to be welded b2 to slightly contact with the piece to be welded a1, close the 11 heaters, buckle the buckle;

[0116] (4) Diffusion connection of the intermediate transition layer: set the pre-pr...

Embodiment 3

[0120] Embodiment Three: In this embodiment: the part to be welded a is made of 40 steel, the part c to be welded is made of 93W tungsten alloy; the intermediate transition layer: the part b to be welded is made of pure vanadium and pure nickel foil; the top The pressure rod is a graphite rod.

[0121] For piece b to be welded, nickel is in the front and vanadium is in the back, that is, nickel and steel are welded, vanadium and tungsten alloy are friction welded, and nickel and vanadium are diffused and joined. Nickel foil 0.03mm, vanadium solid part thickness 1.5mm

[0122] (4) Diffusion connection of the intermediate transition layer: set the pre-pressure to 5MPa, the welding pressure to 56MPa, the heating temperature to 1050°C, the heating rate from 0°C to 700°C is controlled at 8°C / mim, and the temperature rise from 700°C to 1050°C The rate is controlled at 5°C / mim, the temperature is kept for 80 minutes, and the furnace is cooled; the argon gas is introduced to start we...

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Abstract

The invention discloses a dissimilar material composite welding method. The dissimilar material composite welding method comprises the following steps: firstly, a welding device is obtained; secondly, a to-be-welded part a and a to-be-welded part c which are each made of dissimilar materials and wholly in a columnar shape are obtained, and the dissimilar material composite welding method is characterized in that the welding device in the first step further comprises a heater; thirdly, a middle transition layer and a top pressure bar are obtained; fourthly, the middle transition layer and the to-be-welded part a are in diffusion welding; fifthly, friction pre-welding clamping is carried out; sixthly, friction pre-welding preheating is carried out; seventhly, inertia friction welding connection of a material with the middle transition layer is carried out; and eighthly, after-welding treatment is carried out. The dissimilar material composite welding method has the beneficial effects of being higher in welding efficiency and better in welding quality.

Description

technical field [0001] The invention belongs to the field of welding methods, and in particular relates to a welding method between dissimilar materials with large performance differences, and is suitable for materials with large differences in physical and chemical properties such as melting point, hardness, thermal conductivity, linear expansion coefficient, and chemical composition (for example: Welding of aluminum / steel, aluminum / stainless steel, TiAl-based alloy / steel, tungsten alloy / steel, titanium alloy / steel, titanium alloy / stainless steel, etc.). Background technique [0002] In recent years, composite materials made by welding dissimilar materials have been widely used in various industries due to their good performance. For some dissimilar materials with large performance differences, such as aluminum / steel, aluminum / stainless steel, TiAl-based alloy / steel, tungsten alloy / steel, titanium alloy / steel, titanium alloy / stainless steel, etc., due to the melting point, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K28/02B23K103/18
CPCB23K28/02B23K2103/18
Inventor 吴玮朱凌云罗怡张广川戚浩杰杨刚
Owner CHONGQING UNIV OF TECH
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