Aluminum alloy plate and preparation method

Abstract

The invention provides an aluminum alloy plate and a preparation method. The preparation method of the aluminum alloy plate comprises the steps that a first 5000-series aluminum alloy mother plate and a second 5000-series aluminum alloy mother plate are welded through a laser stirring welding technology to obtain the aluminum alloy plate, wherein the surface of the first 5000-series aluminum alloy mother plate and the surface of the second 5000-series aluminum alloy mother plate each comprise a Ti/Zr film. According to the preparation method, the first 5000-series aluminum alloy mother plate and the second 5000-series aluminum alloy mother plate do not need to be specially cleaned before welding, additional filling of welding wires are not needed, the preparation cost is saved, and the aluminum alloy plate which is high in welding strength, equal to a base metal in strength and free of welding defects can be obtained.

Description

technical field [0001] The invention relates to an aluminum alloy plate and a preparation method, belonging to the field of auto parts. Background technique [0002] With the energy crisis and people's concern about environmental pollution, automobile lightweight has become one of the main directions for the development of the automobile industry. In the case of limitations in automotive structural design, the development and application of lightweight materials and lightweight technology has become an important way to achieve lightweight vehicles. The unequal thickness plate is developed based on the individual requirements of the material strength and thickness of different parts of the auto parts, and then the variable thickness parts are formed through the subsequent stamping process. It has been widely used in steel parts, such as B-pillar reinforcement plates, front Longitudinal beams, skylight reinforcement panels, etc. At present, aluminum plates of unequal thickne...

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Problems solved by technology

[0003] However, in general, the aluminum alloys used to manufacture unequal thickness aluminum plates have the following inherent properties: high reflectivity to laser beams, high thermal conductivity, specific heat High, large thermal expansion coefficient, large solidification shrinkage rate (about twice that of iron), large solidification temperature range, low surface tension, low melting point alloy elements and easy evaporation and burning during welding, strong hydrogen absorption ability in liquid state, easy surface Formation of high melting point oxide film

These inherent properties lead to many problems in the welding process of aluminum alloys, such as high requirements on the energy density of the heat source, excessive welding heat input will cause welding deformation; welding is prone to thermal cracks; welding is prone to joint strength attenuation; welding is prone to Defects such as hydrogen pores, slag inclusions, and lack of fusion

[0004] Existing aluminum alloy welding technology, including laser welding, MIG welding (including CMT-MIG welding), TIG welding, etc., all need to degrease the surface of the aluminum plate before welding, Pickling, alkali cleaning, mechanical polishing and other processes to remove surface oil and high melting point oxide film require additional investment in cleaning lines and drying lines, which increases manufacturing difficulty and cost, and the welding cycle is difficult to control. At the same time, the drying process will also affect The influence of the timeliness of the aluminum plate will cause the welding strength attenuation and welding cracking of the aluminum alloy plate, which will affect the stamping performance of the aluminum plate

In order to solve the problems of aluminum alloy welding strength attenuation and welding cracking, the existing technology generally uses filler wire welding, but filler wire welding additionally increases welding costs

[0005] In addition, the traditional laser welding technology has high requirements on the positioning of the laser beam and the assembly clearance of the butt joint

In order to ensure the welding quality, the spot welding method or short-distance test welding is usually used to adjust the incident position of the weld seam, which has low production efficiency and affects the yield of the plate

Moreover, the traditional laser welding technology has high requirements for the assembly clearance, which leads to the need to perform machining on the assembly surface of the plate before assembly, which increases the process and further increases the cost

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