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Electromagnetic auxiliary laser welding method for pre-arranged powder on surface of aluminum alloy

An aluminum alloy surface, pre-powder technology, used in laser welding equipment, welding equipment, welding/welding/cutting items, etc., can solve problems such as easy generation of pores, reduce pores, reduce powder loss, and improve weld formation. Effect

Pending Publication Date: 2021-04-30
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Among them, although the chemical bonding method has a lower powder loss, due to the use of various binders, although some measures such as drying have been taken, defects such as pores are still very easy to occur during the laser welding process. The addition of binders will also have varying degrees of adverse effects on the composition of the weld

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  • Electromagnetic auxiliary laser welding method for pre-arranged powder on surface of aluminum alloy
  • Electromagnetic auxiliary laser welding method for pre-arranged powder on surface of aluminum alloy

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Embodiment Construction

[0033] Combine below Figure 1-2 And example the present invention is described in further detail. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

[0034] An electromagnetic-assisted laser welding method for pre-preparing powder on the surface of an aluminum alloy of the present invention comprises the following steps:

[0035] 1) Selection of welding materials: 2219 aluminum alloy is selected, and its composition is: Si: ≤0.20%; Fe: ≤0.30%; Cu: 5.8-6.8%; Mn: 0.20-0.40%; Mg: ≤0.02%; V: 0.05-0.15%; Zr: 0.10-0.25%; Zn: ≤0.10%; Ti: 0.02-0.10%; Side thickness 6mm, spacing 0.8mm;

[0036] 2) Selection of welding equipment: a laser welding device consisting of KUKA robot KR30HA, TruDisc-12003 disc laser (1) and manipulator. The maximum laser power is 12kW, the wavelength is 1030nm, and the minimum diameter of the optical fiber is 300μm;

[0037] 3) Base material treatmen...

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Abstract

The invention relates to the technical field of aluminum alloy laser welding, and discloses an electromagnetic auxiliary laser welding method for pre-arranged powder on the surface of an aluminum alloy. According to the method, alloy powder is pre-arranged at the butt joint of an aluminum alloy flat plate, meanwhile, an electromagnetic field is additionally arranged to assist laser welding, and the method aims to improve the laser welding quality of the aluminum alloy. Compared with the prior art, the method has the advantages that the problem that the pore defect is prone to being generated due to the fact that powder is pre-arranged through a chemical bonding method is solved; meanwhile, based on the magnetohydrodynamic principle, the electromagnetic field is additionally arranged to change the flow of a molten pool, the magnetic stirring effect is generated on liquid metal, crystal grains are refined, and the weld joint structure is improved; and in the laser welding process, a transverse magnetic field generation device can generate a steady-state magnetic field at the molten pool, the steady-state magnetic field is coupled with an electric field generated by a direct-current power supply, the molten pool is subjected to stable electromagnetic force, so that the weld joint is effectively prevented from collapsing, the mechanical property of a joint is improved, and therefore the reliability of an aluminum alloy welding structural part for aviation is improved.

Description

technical field [0001] The invention relates to the technical field of laser welding, in particular to an electromagnetic-assisted laser welding method for presetting powder on the surface of an aluminum alloy. Background technique [0002] Due to its low density, high specific strength, and good corrosion resistance, aluminum alloys are widely used in the fields of automobiles, ships, chemical industry, and aerospace. Based on the physical properties of aluminum alloys such as high thermal conductivity and large expansion coefficient, laser welding is often used in the industry to weld aluminum alloy structures. Laser welding concentrates high-density energy on the spot, so it has the advantages of energy concentration and high welding efficiency. [0003] However, due to the special physical and chemical properties of aluminum alloys, when welding aluminum alloys by laser, if the welding parameters are not properly controlled, defects such as pores, shrinkage, and undercu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/21B23K26/14B23K26/70B23K26/60B22F7/06B22F3/105C22C21/12C22C21/14C22C21/16C22C21/18
CPCB22F7/064B22F2999/00B23K26/14B23K26/21B23K26/60B23K26/702B23K2103/10C22C21/12C22C21/14C22C21/16C22C21/18B22F2202/05Y02P10/25
Inventor 占小红叶泽涛王磊磊周旭东
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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