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A method of welding titanium-aluminum dissimilar metals using femtosecond laser

A femtosecond laser and dissimilar metal technology, applied in the welding of aluminum metal materials, the femtosecond laser passes through the transparent material to the titanium field, which can solve the problems of poor weldability of aluminum and titanium dissimilar metals, and the joint strength cannot meet the requirements, and achieves fast heating speed. , Strengthen the strength, avoid the effect of being oxidized

Active Publication Date: 2019-01-18
NANJING UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

Therefore, the weldability of aluminum-titanium dissimilar metals is very poor, and the strength of the joint cannot meet the requirements. The welding of aluminum-titanium dissimilar metals is both a hot spot and a difficult point. At present, there is no mature process that can be used in actual production.

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  • A method of welding titanium-aluminum dissimilar metals using femtosecond laser

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Embodiment Construction

[0025] as attached figure 1 As shown, both the titanium plate 1 and the aluminum plate 5 are processed into a size of 3 mm thick and 150 mm×150 mm, and then the surface is cleaned and polished with absolute ethanol. The surfaces of the surfaces to be joined of the titanium plate 1 and the aluminum plate 5 were finished so that the surface roughness Ra was 0.05 μm. Then align the titanium plate 1 and the aluminum plate 5 to be connected with the first clamp 2 and fix them. Then rotate the screw handle 7 to apply pressure to the connection surface to ensure that there is no gap in the connection surface. The glass plate 4 is processed into a cover plate, and the pretreatment is carried out, and the surface is finished, and the surface roughness Ra is 0.04 μm. Then the second clamp 6 is used to fix it around the connection surface around the titanium plate 1 and the aluminum plate 5 to ensure that the connection surface is sealed in the glass plate 4 . Calibrate the focus of t...

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Abstract

The invention discloses a method for welding titanium-aluminum dissimilar metals by adopting a femtosecond laser, which comprises the following steps: processing titanium and aluminum metal materials into two workpieces with identical surfaces to be connected; performing pretreatment and finishing on the workpieces to be connected , so that the surface roughness Ra of the surface to be connected is controlled below 0.08 μm; the finished workpiece to be connected is fixed with a fixture and pressure is applied to ensure that there is no gap on the connection surface; the transparent material is pretreated and made into a cover plate, and then Fix it around the connection surface around the workpiece to be connected to ensure that the connection surface is sealed in the transparent material; use femtosecond laser to align the weld seam to be welded, and weld the connection surface along the weld seam; after the welding is completed, wait for a while, Wait until the workpiece to be welded is completely cooled to room temperature before removing the cover. The invention can connect metal materials at the atomic level through the action of pressure and femtosecond laser, and the obtained welding seam has high strength and good toughness.

Description

technical field [0001] The invention relates to the field of metal material connection, in particular to a method for welding titanium and aluminum metal materials through transparent materials with a femtosecond laser. Background technique [0002] The femtosecond laser has huge instantaneous power and extremely short pulses, and can obtain very high peak intensity at low pulse energy. Due to the characteristics of non-linear effects when irradiating transparent materials, femtosecond lasers can pass through transparent materials for flexible three-dimensional processing relying on the multiphoton absorption mechanism, while long-pulse lasers cannot do this. Moreover, the transparent material is a brittle material, and the thermal stress generated by the long-pulse laser heating will cause the transparent material to crack and fragments to fly out. Because when the laser is irradiated on a transparent material, laser damage will occur, and the damage threshold decreases si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/0622B23K26/24B23K26/60B23K26/12B23K103/18
CPCB23K26/0624B23K26/127B23K26/24B23K26/60B23K2103/18
Inventor 彭勇郭一蒙王克鸿周琦
Owner NANJING UNIV OF SCI & TECH
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