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Welding wire filling method for laser welding to narrow gap of Al-alloy

A technology of laser welding and filler wire, which is applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of difficulty in ensuring the stability of the welding process, the influence of the stability of wire feeding and gas feeding, and the difficulty of floating and precipitation of bubbles, etc., to achieve Improved stability and protective effect, reduced chance of porosity, and refined crystal structure

Inactive Publication Date: 2005-08-24
BEIJING UNIV OF TECH
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Problems solved by technology

[0008] 3) Because the cooling rate of laser welding is too fast, the bubbles are not easy to float and precipitate, and it is easy to generate pores
The quality of high-strength aluminum alloy laser welding with filler wire depends on the alignment accuracy of the welding wire and the effective protection of the welding process. The interference of the welding wire feeding process will immediately lead to weld defects, and the inappropriate gas supply method will also cause the welding process to fail. Stability is difficult to guarantee, and at the same time, the protection effect becomes poor, and there will be a large number of pores in the weld
The traditional welding method, due to the limitation of the gap or groove, the stability of wire feeding and gas feeding will be affected, which will make the welding quality worse

Method used

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  • Welding wire filling method for laser welding to narrow gap of Al-alloy

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Embodiment Construction

[0030] The following are examples of the present invention and comparison of effects.

[0031] Experiment using CO 2 The laser parameters are: wavelength 10.6 μm, power 3500W.

[0032] The aluminum alloy material used in the experiment is: 2219, plate thickness: 20mm.

[0033] Narrow gap form: double-sided symmetrical U-shaped bevel with stud edge, stud edge size: 4mm, U-shaped bevel size: 3mm.

[0034] Laser incidence angle: 30°, the welding wire and shielding gas are coaxially fed into the narrow gap perpendicular to the workpiece surface.

[0035] image 3 and Figure 6 for CO 2 Laser Welding Aluminum Alloy 2219, CO 2 The laser parameters are the above conditions, under the conditions of a narrow gap reserved for the workpiece, welding speed, wire feeding speed and shielding gas flow rate, the commonly used laser is vertically incident, and the welding wire and shielding gas are input at a 45° angle to the surface of the workpiece. The welding method and Comparison o...

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Abstract

A welding wire filling method for the laser welding to narrow gap of Al-alloy features that a (1-10)-mm gap with bevel edge is preserved at the position to be welded before welding, the incident of laser beam is 30-75 deg.C, the welding wire and protecting gas are coaxially fed in said gap, and the welding wire is molten by laser beam to be filled in said gap for binding workpieces.

Description

technical field [0001] The invention relates to a laser welding method of narrow gap aluminum alloy by using filling welding wire, which belongs to the technical field of laser material processing. Background technique [0002] Aluminum and its alloys are one of the most widely used light metals in nonferrous metals. It has low density, light weight, high specific strength, good electrical and thermal conductivity, good corrosion resistance, non-magnetic, good formability, and low temperature performance. With the development of aviation, navigation, and automobile industries; petrochemical With the rise of emerging industries such as telecommunications, atomic energy and space technology, the use of aluminum alloys is increasing, so it occupies a very important position in the national economy. [0003] In manufacturing industries such as aircraft, automobiles and rolling stock, high-strength aluminum alloys are mainly used as thin-walled structures. For a long time, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/21B23K26/70B23K33/00
Inventor 肖荣诗康黎杨武雄陈铠左铁钏
Owner BEIJING UNIV OF TECH
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