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High-frequency induction heating brazing method of molybdenum-rhenium alloy foil

A high-frequency induction heating, molybdenum-rhenium alloy technology, applied in the field of high-frequency induction heating brazing, welding of refractory metals, can solve the problems of low joint strength, low welding production efficiency, burn-through or fracture, etc., to meet the quality requirements and use strength requirements, the joint quality is stable, and the welding speed is fast.

Active Publication Date: 2018-06-22
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the welding of molybdenum-rhenium alloy foil (thickness less than 0.2mm) is only brazing, laser welding and resistance welding. Molybdenum-rhenium alloy foil is prone to burn-through or fracture when connected by high-energy or high-energy beams. , resulting in the inability to achieve a valid connection
In addition, during welding processes such as resistance spot welding, laser welding, and electron beam welding, molybdenum-rhenium alloys will absorb C, O, and N to form brittle compounds and thermal stress, resulting in cracks, and may also form pores, which will reduce the joint strength. performance
Although the brazing process has been adopted and obtained better quality joints, its low welding production efficiency and low joint strength limit its application

Method used

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  • High-frequency induction heating brazing method of molybdenum-rhenium alloy foil

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Embodiment 1

[0024] In this embodiment, the Mo50-Re50 alloy foil is used as the workpiece to be welded, and the size of the foil is 20mm×80mm, and the thickness is 0.18mm.

[0025] The specific high-frequency induction heating brazing process steps of Mo50-Re50 alloy foil are as follows:

[0026] (1) Grind the downward bending direct welding area 8 of Mo50-Re50 alloy foils 3 and 4 and the surrounding upper and lower surfaces with sandpaper, and the non-welding area should also be polished to make the surface leak metallic luster, and use an ultrasonic cleaner to clean the welder parts for cleaning. The specific method is as follows: use 1200# sandpaper to polish the surface areas of both sides of the lower bending area of ​​the molybdenum-rhenium alloy foil, and use 800# sandpaper to polish the non-welding area of ​​3~6mm around the edge, making it leak metallic luster; Put the sample into a glass container with acetone, perform ultrasonic cleaning at 40°C for 20 minutes, and then perform...

Embodiment 2

[0034] In this embodiment, the Mo50-Re50 alloy foil is used as the workpiece to be welded, and the size of the foil is 20mm×80mm, and the thickness is 0.18mm.

[0035] The specific high-frequency induction heating brazing process steps of Mo50-Re50 alloy foil are as follows:

[0036] (1) Grind the downward bending direct welding area 8 of Mo50-Re50 alloy foils 3 and 4 and the surrounding upper and lower surfaces with sandpaper, and the non-welding area should also be polished to make the surface leak metallic luster, and use an ultrasonic cleaner to clean the welder parts for cleaning. The specific method is as follows: use 1200# sandpaper to polish the surface areas of both sides of the lower bending area of ​​the molybdenum-rhenium alloy foil, and use 800# sandpaper to polish the non-welding area of ​​3~6mm around the edge, making it leak metallic luster; Put the sample into a glass container with acetone, perform ultrasonic cleaning at 40°C for 20 minutes, and then perform...

Embodiment 3

[0044] In this embodiment, the Mo50-Re50 alloy foil is used as the workpiece to be welded, and the size of the foil is 20mm×80mm, and the thickness is 0.18mm.

[0045] The specific high-frequency induction heating brazing process steps of Mo50-Re50 alloy foil are as follows:

[0046] (1) Grind the downward bending direct welding area 8 of Mo50-Re50 alloy foils 3 and 4 and the surrounding upper and lower surfaces with sandpaper, and the non-welding area should also be polished to make the surface leak metallic luster, and use an ultrasonic cleaner to clean the welder parts for cleaning. The specific method is as follows: use 1200# sandpaper to polish the surface areas of both sides of the lower bending area of ​​the molybdenum-rhenium alloy foil, and use 800# sandpaper to polish the non-welding area of ​​3~6mm around the edge, making it leak metallic luster; Put the sample into a glass container with acetone, perform ultrasonic cleaning at 40°C for 20 minutes, and then perform...

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Abstract

The invention belongs to the field of metal material welding, and relates to a welding method of refractory metal, in particular to a high-frequency induction heating brazing method of molybdenum-rhenium alloy foil with the thickness smaller than 0.2 mm. The method includes the steps that the molybdenum-rhenium alloy foil is cut, and a welded zone is machined into a downwards-bent butt joint structure. Ni-Cr-Si-B or Ni-Mn-Cu-Zr series blocky brazing filler metal is added into the welded zone and placed in the position between an up induction coil and a lower induction coil, and power-on welding is carried out, wherein the upper induction coil and the lower induction coil are formed through halving. According to welding process parameters, the power of a high-frequency generator is 5.5 kW,the power ratio ranges from 45% to 75%, the power-on time ranges from 15 s to 40 s, and the maximum induction heating temperature is controlled to be 1,050 DEG C. During welding, the molybdenum-rhenium alloy foil is in butt joint with downwards-bent zone metal through an upper ceramic push rod to achieve straight butt joint. By the adoption of the method, effective connection of the molybdenum-rhenium alloy foil can be achieved, brazing connectors without air holes or cracks and with the attractive appearance are obtained, and the quality of the connectors is stable. The method has the beneficial effects of being simple in process, high in welding speed, low in cost, convenient to popularize and the like.

Description

technical field [0001] The invention belongs to the field of metal material welding, and relates to a welding method for refractory metals, in particular to a high-frequency induction heating brazing method for molybdenum-rhenium alloy foils with a thickness less than 0.2 mm. Background technique [0002] Molybdenum-rhenium alloys are widely used in the fields of chemistry, metallurgy, electronics, aerospace, nuclear industry, and national defense and military due to their excellent high-temperature creep resistance, low-temperature toughness, wear resistance, and corrosion resistance. Electronic components, radar antenna parts and thermocouples, etc. Mo50-Re50 series alloys have the best comprehensive properties among the currently prepared molybdenum-rhenium alloys, and the tensile strength at room temperature exceeds 1000 MPa. They are usually prepared as foils or wires for use. However, there are inevitably welding or connection problems during use, but its welding is d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/002B23K1/20B23K1/19
CPCB23K1/002B23K1/19B23K1/206
Inventor 刘鹏孙思宇徐淑波任国成孙星
Owner SHANDONG JIANZHU UNIV
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