Device and method adopting high-rigidity metal for friction surfacing of low-rigidity metal

A low-hardness metal and high-hardness technology, applied in the field of solid-phase welding, can solve the problems of waste of materials, low efficiency, short duration of high temperature, etc., and achieve the effect of expanding the selection range, good continuous controllability, and high heating efficiency

Active Publication Date: 2016-01-06
JIANGSU SHUOSHI WELDING SCI & TECH
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  • Claims
  • Application Information

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Problems solved by technology

This method can realize the first preheating of high-hardness metals, which can soften high-hardness metals in advance and realize welding between metals with different hardness. However, the high temperature duration of this method is short, and subsequent frictional heating cannot be continued. Realize continuous surfacing welding, and if the pre-friction softening is not enough, it is easy to turn the steel into a milling cutter to mill out a groove in aluminum. This method cannot achieve precise temperature control and wastes materials, and the efficiency is low
[0004] Scholars M.J.R.Stegmueller used induction heating coils to heat the steel rods in the steel friction surfacing experiment to soften the steel and then perform friction surfacing. This method can realize the welding of aluminum and steel, but it cannot accurately control the temperature of the steel rods, and also There is no temperature device to cool the aluminum plate, so it uses a thick aluminum plate to prevent the steel rod from milling the aluminum plate
[0005] Zhang Hongtao of Harbin Institute of Technology used the CMT melting-brazing method to study the aluminum-steel with a large difference in hardness. The analysis of the interface structure of the aluminum / galvanized steel plate CMT melting-brazing lap joint showed that the joint interface was mainly composed of two types. Compound phase composition, respectively Fe with uniform thickness near the steel side 2 Al 5 phase and needle-like FeAl near the aluminum side 3 phase, indicating that this traditional fusion welding method cannot prevent the generation of aluminum-steel intermetallic compounds and will form brittle phases

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  • Device and method adopting high-rigidity metal for friction surfacing of low-rigidity metal
  • Device and method adopting high-rigidity metal for friction surfacing of low-rigidity metal

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Embodiment 1

[0043] In this embodiment, the above-mentioned device is used for preparation, and A3 steel is used for friction surfacing welding of LY12 aluminum alloy metal. The hardness of A3 steel is HV165, and the hardness of LY12 aluminum alloy is HV120. The resistance heating device 7 heats and controls the temperature of A3 steel at 500°C- 800 ℃, LY12 aluminum alloy is fixed on the water cooling device 2, and the water cooling device 2 is fixed on the workbench 1. The size of the A3 steel rod in the test is φ20mm, and the size of the LY12 aluminum plate is 300mm*150mm*6mm. The specific steps of the welding process are as follows:

[0044] Step (1), start the resistance heating device 7 to heat the end section of the A3 steel rod, adjust the power supply to set the current to 900A, and heat the temperature of the A3 steel rod to the preheating temperature of 500°C. Preheating the end section of the A3 steel rod can not only preheat the temperature of the steel rod, but also maintain the ...

Embodiment 2

[0049] In this embodiment, the above-mentioned device is used for preparation, and A3 steel is used for friction surfacing welding of T2 pure copper. The hardness of A3 steel is HV165, and the hardness of T2 pure copper is HV68. The resistance heating device 7 heats and controls the temperature of A3 steel at 800°C-1000°C. ℃, T2 copper is fixed on the water cooling device 2, and the water cooling device 2 is fixed on the workbench 1. In the test, the size of the A3 steel rod is φ20mm, and the size of the T2 copper plate is 300*150*6mm. The specific steps of the welding process are as follows:

[0050] Step (1), start the resistance heating device 7 to heat the end section of A3 steel, adjust the power supply to set the current to 1200A, and heat the temperature of A3 steel to the preheating temperature of 800°C. Preheating the end section of A3 steel plays a role in preheating The steel temperature can also maintain the rigidity of the upper section of A3 steel to ensure the pr...

Embodiment 3

[0058] In this embodiment, the same device and process as in Embodiment 2 are used, and the temperature of the A3 steel is heated to the preheating temperature and replaced with 500°C. The specific steps of the welding process are as follows:

[0059] Step (1), start the resistance heating device 7 to heat the end section of the A3 steel, and heat the temperature of the A3 steel to the preheating temperature of 500°C. Preheating the end section of the steel can keep the upper section of the steel while achieving the temperature of the preheated steel. The rigidity ensures the pressure between the two metals, avoiding the overall softening and yielding of the high-hardness metal and failing to provide pressure.

[0060] In step (2), the cooling device 2 feeds flowing cooling water through the through hole at the bottom, the temperature of the water is -5°C, and the speed is 2m / min. The cooling water cools the T2 copper to maintain its rigidity and form a temperature gradient; ...

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Abstract

The invention discloses a device and method adopting high-rigidity metal for friction surfacing of low-rigidity metal. The device comprises a power device, a resistor and a cooling device coated with a copper layer. The power device enables the high-rigidity metal to rotate and provide pressure. One end of the resistor is connected with the high-rigidity metal, the other end of the resistor is fixedly connected with the power device, and the resistor is connected with the high-rigidity metal through a brush to form an access. The low-rigidity metal is placed on the copper layer. According to the invention, the high-rigidity metal is preheated, the low-rigidity metal is cooled, and therefore control over the metal rigidity and the softening state in the friction surfacing process of the high-rigidity metal and the low-rigidity metal can be achieved. The device is good in continuity and controllability in the welding process, high in work efficiency and long in service life.

Description

technical field [0001] The invention belongs to the field of solid-phase welding, in particular to a device and method for friction surfacing welding of low-hardness metal with high-hardness metal. Background technique [0002] Friction surfacing is an advanced metal processing technology that uses frictional heat to make the local area of ​​the metal connection in a thermoplastic state to achieve welding / welding deposition. Friction surfacing has the advantages of low energy consumption, no pollution, high efficiency, and good processing quality. Corroded metals can use friction welding deposition technology to obtain a non-diluted, high-integrity welding layer. Friction surfacing technology has broad application prospects in the manufacture and repair of wear-resistant parts. Friction surfacing technology is not limited to welding technology It can also widely broaden its application range, and has great development potential in rapid manufacturing of friction rolling part...

Claims

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Application Information

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IPC IPC(8): B23K20/12B23K20/26
CPCB23K20/12B23K20/26
Inventor 周琦王克鸿朱军彭勇王春桂
Owner JIANGSU SHUOSHI WELDING SCI & TECH
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