Aluminum alloy welding wire and method for welding aluminum-lithium alloy parts

Abstract

The invention discloses an aluminum alloy welding wire and a method for welding an aluminum-lithium alloy component. The aluminum alloy welding wire is composed of 5.9-6.5 wt% of copper, 5.0-6.0 wt% of silicon, 0.3-0.35 wt% of manganese, 0.15-0.17 wt% of titanium, not larger than 0.015 wt% of magnesium, not larger than 0.010 wt% of boron, not larger than 0.005 wt% of zinc, the balance aluminum and impurities produced under the manufacturing conditions. By the adoption of the aluminum alloy welding wire and the method for welding the aluminum-lithium alloy component, the high welding strength can be achieved; compared with existing welding wire solder, welding defects such as cracks are reduced greatly, and finer weld joint grains can be obtained; and it is proved by a welding test that compared with an existing conventional aluminum alloy welding wire, the intensity of weld joints can be improved by over 48 MPa, meanwhile the higher plasticity is maintained, and the fatigue life can be prolonged to as high as about 25%.

Description

technical field [0001] The invention relates to the field of welding, in particular to an aluminum alloy welding wire and a method for welding aluminum-lithium alloy parts. Background technique [0002] Due to its high specific strength and good corrosion resistance, aluminum-lithium alloys have become ideal materials in the aerospace field. Studies have shown that adding 1% lithium to aluminum alloys can reduce the density of aluminum alloys by about 3%, and the elastic modulus The amount increased by 6%, and the specific elastic modulus increased by 9%. The use of aluminum-lithium alloys can help civil aircraft reduce the weight of the fuselage structure, reduce aircraft fuel consumption, reduce operating costs, reduce carbon dioxide emissions, and be more energy-saving and environmentally friendly. [0003] With the continuous development of material technology, the third generation of aluminum-lithium alloys has been developed abroad. While maintaining the excellent pro...

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Problems solved by technology

[0007] The technical problem to be solved in the present invention is to overcome the defects that the welding wire in the prior art is not high in welding strength and prone to welding defects when it is used for welding new aluminum-lithium alloys, and proposes an aluminum alloy welding wire and a method for welding aluminum-lithium alloy parts method

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