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Molybdenum alloy and graphite high-strength welding joint structure and machining method thereof

A technology of welding joints and welding methods, applied in metal processing equipment, welding equipment, manufacturing tools, etc., can solve problems such as difficult processing of special-shaped structural parts, inability to form surface morphology, and small beneficial effects, so as to improve bonding strength and improve Welding efficiency and quality, effect of improving shear strength

Pending Publication Date: 2022-02-15
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the beneficial effect of sandblasting on improving the strength of the joint is small, and it cannot form a regular surface topography
On the one hand, laser processing is expensive, and on the other hand, it is difficult to process special-shaped structural parts. Therefore, a molybdenum alloy and graphite high-strength welded joint structure and its processing method are needed.

Method used

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  • Molybdenum alloy and graphite high-strength welding joint structure and machining method thereof
  • Molybdenum alloy and graphite high-strength welding joint structure and machining method thereof
  • Molybdenum alloy and graphite high-strength welding joint structure and machining method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Using ck6150 CNC lathe, the cutting program is set according to the processing drawings through the program, the back cutting amount is set to 0.15mm, the spindle speed is 600r / min, the feed rate is 0.1mm / r, and the cutting speed is 200m / min. It is made of cemented carbide. The processed special tool processes a groove-shaped structure on the graphite surface. The processed groove depth is 130um and the angle is 43.5°; put the polished molybdenum alloy alloy, foil-shaped solder, and processed graphite into alcohol After ultrasonic cleaning, molybdenum alloy / brazing material / graphite are assembled respectively from bottom to top, and put into a vacuum brazing furnace for brazing; through shear experiments, it is found that the strength of this brazing joint can reach 26.3Mpa, high 24.1Mpa at unprocessed graphite brazing joints.

Embodiment 2

[0047] Using ck6150 CNC lathe, the cutting program is set according to the processing drawings through the program, the back cutting amount is set to 0.18mm, the spindle speed is 625r / min, the feed rate is 0.2mm / r, and the cutting speed is 225m / min. It is made of cemented carbide. The special tool processed a groove-shaped structure on the graphite surface. The groove depth after processing is 180um, the angle is 43.5°, and the period is about 200um. figure 2 The scanning electron microscope image is shown. Put the polished molybdenum alloy alloy, foil-shaped solder, and processed graphite into alcohol for ultrasonic cleaning, then assemble molybdenum alloy / braze / graphite from bottom to top, and put them into a vacuum brazing furnace Brazing. Through the shearing experiment, the strength of this brazing joint can reach 25.3Mpa, which is higher than the 24.1Mpa of the unprocessed graphite brazing joint;

[0048] image 3 It is the scanning electron micrograph of the molybde...

Embodiment 3

[0050] Using ck6150 CNC lathe, the cutting program is set according to the processing drawings through the program, the back cutting amount is set to 0.2mm, the spindle speed is 650r / min, the feed rate is 0.3mm / r, the cutting speed is 250m / min, and the cemented carbide material is used. The special tool processed a groove-shaped structure on the graphite surface. The groove depth after processing is 160um and the angle is 43.5°. Put the polished molybdenum alloy alloy, foil-shaped brazing filler metal, and processed graphite into alcohol for ultrasonic cleaning, then assemble molybdenum alloy / brazing filler metal / graphite from bottom to top, and put them into a vacuum brazing furnace Brazing, the appearance of the welded joint is as follows image 3 shown. The strength of this brazing joint can reach 28.6Mpa through shear experiments, which is higher than the 24.1Mpa of unprocessed graphite brazing joint;

[0051] Such as figure 2 It is the scanning electron microscope pic...

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Abstract

The invention belongs to the technical field of welding, particularly relates to a molybdenum alloy and graphite high-strength welding joint structure and a machining method thereof. According to the following scheme, a welding method of the molybdenum alloy and graphite high-strength welding joint structure comprises the following steps of S1, forming and processing a groove of a welding joint; S2, carrying out welding pro-processing; S3 welding the welding joint, wherein the above step S1 comprises processing a sawtooth channel type structure on the welding face of graphite through a numerical control lathe and a cutter, and sharpening the machined sawtooth channel type structure into a structure with the triangular cross section. According to the molybdenum alloy and graphite high-strength welding joint structure of the present invention, the machining operation and the welding operation are convenient, the shearing strength of the welding face of a welded workpiece is improved, the bonding strength of the welded workpiece is improved, the prepared workpiece has good compactness and shearing strength, the workpiece welding efficiency and quality are improved, and the workpiece welding machining speed is increased.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a molybdenum alloy and graphite high-strength welded joint structure and a processing method thereof. Background technique [0002] Due to its high melting point (2620 °C), low expansion coefficient, good mechanical properties at high temperature, and excellent electrical and thermal conductivity, molybdenum alloys have attracted extensive attention in many high-temperature applications, such as nuclear energy, aerospace, and X-ray targets. and other fields. However, due to the high density of molybdenum alloy, it is difficult to process and weld, which limits its further widespread application. In addition, due to its low density, high wear resistance, excellent thermal conductivity, good ablation resistance, thermal shock resistance, fatigue resistance, corrosion resistance and other characteristics, graphite is also widely used in aerospace, nuclear energy , medical, milita...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B23K1/008B23K1/20
CPCB23P15/00B23K1/008B23K1/206B23P2700/11
Inventor 罗来马张鹏刘东光吴玉程
Owner HEFEI UNIV OF TECH