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Laser penetration brazing method for dissimilar alloy

A brazing method and alloy technology, which is applied in the field of laser material processing, can solve problems affecting the mechanical properties of joints, lack of fusion, stability, and poor weld formation, so as to improve spreading and infiltration ability, good weld formation, and welding efficiency Improved effect

Inactive Publication Date: 2011-08-10
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This avoids the formation of a large number of intermetallic compounds from the mixing of two metals in liquid state, but the welding process stability and weld shape of this welding method are poor, and it is easy to appear unfused phenomenon at the interface, which affects the mechanical properties of the joint.

Method used

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  • Laser penetration brazing method for dissimilar alloy
  • Laser penetration brazing method for dissimilar alloy
  • Laser penetration brazing method for dissimilar alloy

Examples

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Effect test

example 1

[0025] Example 1. Using a fiber laser with a wavelength of 1070nm, the focused laser beam (1) is vertically incident on the titanium alloy side, and the distance d between the laser beam (1) and the interface (6) is 0.6mm. Aluminum alloy material: 6061, titanium alloy: TC4, thickness: 3mm; laser power 3100W. figure 2 The cross-sectional view of the weld with the above parameters shows that the maximum thickness of the intermetallic compound layer formed on the upper part of the weld interface is 10 μm, and there is basically no intermetallic compound layer on the lower part.

example 2

[0026] Example 2, using a fiber laser with a wavelength of 1070nm, the focused laser beam (1) is obliquely incident on the titanium alloy side, wherein the angle between the laser beam and the normal is 6°, and the distance d between the laser beam (1) and the interface (6) is 0.6 mm. Aluminum alloy material: 6061, titanium alloy: TC4, thickness: 3mm; laser power 3100W. image 3 The cross-sectional profile of the weld with the above parameters shows that a uniform intermetallic compound layer is formed at the interface of the weld with a thickness of about 5 μm.

[0027] Depend on figure 2 ,3 It can be seen that the welding seam obtained by the present invention has no obvious defects such as cracks and pores, and the welding process is stable. At the same time, due to the existence of a solid intermediate layer in the titanium alloy at the interface, it avoids the mixing of the two metals in a liquid state to produce a thicker intermetallic compound layer. Performance is i...

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Abstract

The invention discloses a laser penetration brazing method for dissimilar alloy and belongs to the technical field of laser material processing. The method comprises the following steps of: during welding, allowing a focused laser beam (1) to act on one side of a high-melting-point parent material (5) to realize penetration fusion welding; and controlling a distance d of the laser beam (1) and an interface (6) on the surface of the high-melting-point parent material and an included angle theta between the laser beam (1) and a normal line, forming a high-melting-point parent material solid state intermediate layer (2) on the high-melting-point parent material side close to the interface (6), melting a low-melting-point parent material (4) through the heat conduction of the high-melting-point parent material solid state intermediate layer (2), and spreading and soaking the high-melting-point parent material (5) on a melted low-melting-point parent material layer (3) to realize the laser penetration brazing of the dissimilar alloy. The laser energy utilization rate and welding efficiency are obviously improved, and the welding of a dissimilar alloy plate with a certain thickness can be realized. The influence of mixing two kinds of metal liquid states at the interface to generate a complex and brittle intermetallic compound on joint quality is avoided.

Description

technical field [0001] The invention relates to a laser deep-penetration brazing method for dissimilar alloys, belonging to the technical field of laser material processing. Background technique [0002] With the development of science and technology, modern industry has put forward higher and more stringent requirements for the performance of components. In addition to conventional mechanical properties, high temperature strength, wear resistance, corrosion resistance, low temperature toughness, and radiation resistance are also required. , magnetism, electrical conductivity, thermal conductivity and many other properties, and at the same time in consideration of economical and energy saving, it is required to be cheaper and lighter. It is difficult for a single metal material to meet these requirements at the same time. Even if a certain metal material may be relatively ideal, it is often too scarce and expensive to be used in large quantities. At the same time, the entir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/005
Inventor 肖荣诗陈凯华董鹏
Owner BEIJING UNIV OF TECH
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