A method of rotational friction welding of titanium alloy and steel heterogeneous

A technology of rotary friction welding and titanium alloys, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of poor joint plasticity and high temperature performance, affecting the service life of welded parts, affecting the mechanical properties of welded joints, etc. Achieve the effect of good welding interface, improve welding efficiency and good welding reliability

Active Publication Date: 2021-12-24
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0004] Generally speaking, if the intermetallic compounds present in the welded joints of heterogeneous friction welding will seriously affect the mechanical properties of the welded joints, and directly affect the service life of the welded parts
[0005] For the heterogeneous welding of titanium alloys and steel, Ti / Fe brittle phases will be formed at the weld during the welding process. In addition, the alloying elements chromium and nickel in steel can also form brittle intermetallic compounds with Ti; at the same time, titanium is also Strong carbon compound forming elements will form brittle TiC with carbon in some steels, resulting in a serious decline in the mechanical properties of the weld and a greatly reduced elongation. Under the action of welding stress, it is easy to cause cracks in the weld and lead to the plasticity of the joint. and high temperature performance deterioration, thereby affecting the service life of weldments

Method used

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  • A method of rotational friction welding of titanium alloy and steel heterogeneous

Examples

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Comparison scheme
Effect test

Embodiment example 1

[0028] A method for rotational friction welding of titanium alloy and steel heterogeneity. Prepare as follows:

[0029] (1) Process the end face: chamfer the end face of TC4 titanium alloy and 316 stainless steel with a slope of 15°, leave a center circle with a diameter of 10mm and grind it to smooth;

[0030] (2) Titanium-copper pressure welding: pressure-weld a red copper sheet with the same diameter and a thickness of 1 mm to the end face of TC4 at a temperature of 950 ° C, a pressure of 10 MPa, and a pressure-welding time of 20 minutes.

[0031] (3) Cleaning before welding: Use a turning tool to remove the rough surface and scrub it with acetone.

[0032] (4) Rotary welding: fix TC4 to the main shaft, perform autorotation (700rpm) and gradually contact the fixed 316 stainless steel end face, the distance between the two is 100mm, the primary and secondary pressures are 400, 800kg respectively, and the upsetting pressure It is 1500kg, and the forward speed of the main sh...

Embodiment example 2

[0035] A method for rotational friction welding of titanium alloy and steel heterogeneity. Prepare as follows:

[0036] (1) Processing end face: TA2 pure titanium and 45# steel end face are chamfered, the slope is 5°, and the diameter of the central circle is 10mm and polished to smooth;

[0037] (2) Titanium-copper pressure welding: pressure-weld a red copper sheet with the same diameter and a thickness of 1 mm to the end face of TA2 at a temperature of 900 ° C, a pressure of 5 MPa, and a pressure-welding time of 30 minutes.

[0038] (3) Cleaning before welding: Use a turning tool to remove the rough surface and scrub it with acetone.

[0039] (4) Spin welding: fix pure titanium to the main shaft, perform autorotation (800rpm) and gradually contact with the fixed 45# steel end face, the distance between the two is 150mm, the primary and secondary pressures are 500, 1000kg respectively, and the top The forging force is 1500kg, and the forward speed of the spindle is 1mm / s. ...

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Abstract

A method for dissimilar rotary friction welding of titanium alloy and steel belongs to the field of solid-phase connection of dissimilar metals. In order to realize the heterogeneous welding of titanium alloy and steel and avoid the generation of brittle phase in the welding zone, the invention uses copper as the welding transition metal to obtain high-quality friction welding seam by rotating friction welding, and realizes the heterogeneous welding of titanium alloy and steel. Welded parts. The invention uses Cu as the intermediate phase to realize the heterogeneous welding of titanium alloy and steel, which not only effectively prevents the diffusion of elements in Ti and steel, but also eliminates brittle phases such as Ti / Fe intermetallic compounds, improves the strength of the welded joint, and at the same time makes the The welded joint is firm, which effectively improves the quality and performance of the welded joint. The invention has the advantages of simplicity and convenience, high welding efficiency, excellent quality and performance of the obtained welded joint, and greatly reducing labor and processing costs.

Description

technical field [0001] The invention belongs to the field of solid-phase connection of dissimilar metals, and provides a method for rotational friction welding of titanium alloy and steel heterogeneity. Background technique [0002] Friction welding uses frictional heat as the heat source to make the workpiece plastically deform under pressure and complete the welding. Due to the low welding temperature of friction welding compared with other fusion welding methods, the grain growth is not obvious, and because of the low temperature and mechanical force, the grains may even be refined. At the same time, there are few welding defects in friction welding, and there are basically no pores and unfused areas. Therefore, friction welding is currently widely used in aviation, aerospace, nuclear energy, weapons and other fields to achieve high-quality welded joints with stable performance and good consistency. [0003] Among them, heterogeneous friction welding is to use friction ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/12B23K20/24B23K20/26
CPCB23K20/122B23K20/24B23K20/26B23K2103/18
Inventor 杨芳魏家树秦乾郭志猛陈存广王海英周洋邵艳茹申雨晗
Owner UNIV OF SCI & TECH BEIJING
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