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Connection method for thick plate TiNi alloy and titanium alloy dissimilar materials

A technology of dissimilar materials and connection methods, applied in welding equipment, metal processing equipment, electron beam welding equipment, etc., can solve the problems of severe joint embrittlement and poor comprehensive mechanical properties of joints, and achieve grain refinement and joint structure uniformity. The effect of reducing and preventing joint cracks

Active Publication Date: 2017-12-01
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to avoid the occurrence of welding cracks by using traditional welding methods. Even if measures are taken to avoid the formation of cracks, there are still many brittle intermetallic compounds in the welded joints, which makes the joints brittle seriously and the comprehensive mechanical properties of the joints are poor.

Method used

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  • Connection method for thick plate TiNi alloy and titanium alloy dissimilar materials
  • Connection method for thick plate TiNi alloy and titanium alloy dissimilar materials
  • Connection method for thick plate TiNi alloy and titanium alloy dissimilar materials

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The invention provides a method for connecting thick-plate TiNi alloys and titanium alloy dissimilar materials, such as Figure 1-3 It is the main process diagram; the experiment uses TiNi shape memory alloy (titanium-nickel atomic ratio is 50.4:49.6) and TC4 titanium alloy, the size of TC4 is 100×70×3mm, the size of TiNi alloy is 100×70×3.05mm, and the filling metal is pure 99.9% niobium sheet with a thickness of 0.4mm. If the thickness is too thin, Nb will melt and lose its physical barrier effect, making the dissimilar materials to be welded contact with each other to form brittle intermetallic compounds. If it is too thick, it will be difficult to make the TiNi alloy side fully metallurgical with Nb. The reaction leads to a decrease in the strength of the joint, such as figure 1 ; The working distance of the vacuum chamber is 290CM, the welding speed is 600 mm / min, the electron beam current is 18mA, and the workpiece is preheated for 4 times with a 3mA electron beam...

Embodiment 2

[0027] The invention provides a method for connecting thick-plate TiNi alloys and titanium alloy dissimilar materials, such as Figure 1-2 , 4 is the main process diagram; the test uses TiNi shape memory alloy (titanium-nickel atomic ratio is 50.4:49.6) and TC4 titanium alloy, the size of TC4 is 100×70×3mm, the size of TiNi alloy is 100×70×3.05mm, the filler metal It is a niobium sheet with a purity of 99.9% and a thickness of 0.6mm. If the thickness is too thin, Nb will melt and lose its physical barrier effect, causing the dissimilar materials to be welded to contact each other to form brittle intermetallic compounds. If it is too thick, it will be difficult to make the TiNi alloy side contact with the Nb Full metallurgical reaction leads to reduction of joint strength, such as figure 1 ; The working distance of the vacuum chamber is 290CM, the welding speed is 600 mm / min, the scanning waveform is circular, the scanning frequency is 500 Hz, the scanning amplitude is 0.25 mm,...

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Abstract

The invention discloses a connection method for thick plate TiNi alloy and titanium alloy dissimilar materials. The connection method comprises the following steps that a TiNi alloy is subjected to acid pickling to the specified thickness; abrasive paper is used for grinding welded end faces of the dissimilar materials till the welded end faces are level; the position between the butt-joint materials is filled with Nb bars, and a clamp is used for fixing the welding materials; and finally the clamp and the welding materials are fed into an electronic beam equipment vacuum chamber together, electronic beams deviate to one side of a titanium alloy for welding, and a welding joint high in strength and good in comprehensive mechanical performance is obtained. According to the welding method, cracks generated by thick plate TiNi alloy and titanium alloy welding are eliminated; forming of Ti2Ni and other brittle intermetallic compounds is hindered; structure distribution is uniform, and grains are finer; and the strength of extension of the scanning welding joint reaches 551 MPa, the joint toughness is good, good comprehensive performance is achieved, and large engineering significance is achieved.

Description

technical field [0001] The invention relates to a method for connecting thick plate TiNi alloy and titanium alloy dissimilar materials, belonging to the field of welding technology. technical background [0002] TiNi alloy has superelasticity, corrosion resistance, shape memory effect, biocompatibility and good damping effect. With its excellent comprehensive performance, it is widely used in aerospace, biomedical, nuclear industry and household appliances. It is currently used The most extensive shape memory alloy; titanium alloy is widely used in aircraft manufacturing, aerospace, medical equipment, automobile, shipbuilding and other fields due to its high specific strength, excellent comprehensive mechanical properties, corrosion resistance and biocompatibility, and has become a modern An indispensable member of the industry. In order to meet the needs of multifunctional components showing multiple functions during use, the connection of dissimilar materials has become a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K15/06B23K15/00
CPCB23K15/0033B23K15/0046B23K15/06B23K2103/18
Inventor 陈玉华占字林刘颖陈伟
Owner NANCHANG HANGKONG UNIVERSITY
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