DE102018002350A1 - Metal multilayer material - Google Patents

Abstract

The invention relates to a metal multilayer material (1), comprising two edge layers (2), between which a core layer (3) is arranged. According to the invention, the core layer (3) is formed from a high silicon-containing aluminum alloy.

Description

The invention relates to a metal multilayer material according to the features of the preamble of claim 1.

From the prior art, as in the DE 34 46 780 A1 described a method and a connecting material for the metallic joining of components known. In the method, a multilayer metal interconnect material is interposed between the components. The bonding material has a core layer of lead or an alloy of tin, antimony and silver. This core layer is covered on both sides with a surface layer of tin.

The invention is based on the object of specifying a comparison with the prior art improved metal multilayer material.

The object is achieved by a metal multilayer material having the features of claim 1.

Advantageous embodiments of the invention are the subject of the dependent claims.

A metal multilayer material comprises two edge layers, between which a core layer is arranged. According to the invention, the core layer is formed from a high silicon-containing aluminum alloy.

The inventive solution, in particular an aluminum multi-layer material is realized, which enables process-reliable resistance spot welding and laser beam welding. Alloys and structures known from the prior art tend to intercrystalline corrosion from 80 ° C. This is not the case with the solution according to the invention, so that by means of the metal multilayer material according to the invention, in particular formed as an aluminum multi-layer material, the joining methods resistance spot welding and laser beam welding without filler material can be used on the same component formed by means of the metal multilayer material according to the invention. As a result, in particular a more flexible shell production for vehicles is possible.

Advantageously, the edge layers are each formed from a standard aluminum material. They advantageously each have a greater thickness than the core layer. The metal multilayer material is thus advantageously an aluminum multilayer material, which consists of an inner thin core layer of a high silicon-containing aluminum alloy and two thicker outer edge layers of a standard aluminum material.

Embodiments of the invention will be explained in more detail below with reference to a drawing.

• 1 eine schematische Darstellung eines Metall-Mehrschichtwerkstoffs.

Showing:

• 1 a schematic representation of a metal multilayer material.

1 shows a schematic representation of a metal multilayer material 1 which is rolled, for example, wherein by means of an arrow a rolling direction W is shown. The metal multilayer material 1 includes two edge layers 2 between which a core layer 3 is arranged.

Aluminum multi-layer materials are already known, which are a core layer 3 made of aluminum 6xxx alloys and surface layers 2 made of highly silicon-containing aluminum alloys. These aluminum multilayer materials were developed for laser welding without filler material and enable laser welding without hot cracks in a large process window.

The disadvantage of these known aluminum multilayer materials is that the process window is very small in resistance spot welding with welding parameters suitable for mass production and that spatter occurs at an early stage. Therefore, these aluminum multilayer materials can not be used reliably in mass production, for example, for the manufacture of structural parts for vehicles, in connection with resistance spot welding.

For such a shell manufacture, for example, it is provided that mainly additive-free joining techniques are used. These include mainly the thermal joining techniques resistance spot welding and laser welding. Although there are aluminum 5xxx alloys, which can process reliable, especially without the occurrence of hot cracks in a sufficiently large process window can be added by these two preferred joining techniques, but these aluminum 5xxx alloys from a long-term exposure greater than 80 ° C have a tendency to Intercrystalline corrosion, so they have only a very limited range of applications in the vehicle.

The one described below and in 1 shown metal multilayer material 1 is an aluminum multilayer material, which does not have these disadvantages and therefore in addition to laser welding without filler material with resistance spot welding in each case sufficiently large process window is added and can be used in many different body areas of vehicles.

This is achieved by an adapted construction of the metal multilayer material designed as an aluminum multilayer material 1 , The core layer 3 , which in particular as a thin core layer 3 is made of a highly siliceous aluminum alloy, which allows the use of laser welding without filler material in comparison to the aluminum 6XXX alloys in mass production. In particular, hot cracks are thereby avoided. The core layer 3 For example, has a silicon content adjusted to a thickness ratio, so that the silicon content in the weld metal is at least two percent by weight. In the multi-layer aluminum materials used in mass production, the silicon content of the aluminum alloy is the core layer 3 thus in particular greater than eight percent by weight.

The two boundary layers 2 are thicker than the core layer 3 , For them, a training from standard aluminum materials is provided, for example made of aluminum-6XXX alloys, ie they each advantageously consist of a standard aluminum material, for example of an aluminum-6XXX alloy, in particular of an aluminum alloy with a lower silicon content than the core layer 3 ,

Due to this adapted structure of the metal multilayer material 1 , in particular through the thin core layer 3 From a high silicon-containing aluminum alloy, the process window is not significantly reduced in resistance spot welding. When using this formed as an aluminum multilayer composite metal multilayer material 1 For body parts thus both joining methods, ie resistance spot welding and laser beam welding without filler material, can be used on the same component. This makes a much more flexible shell production of vehicles with an aluminum-intensive shell possible.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 3446780 A1 [0002]

Claims (7)

Metal multilayer material (1), comprising two edge layers (2), between which a core layer (3) is arranged, characterized in that the core layer (3) is formed from a high silicon-containing aluminum alloy. Metal multilayer material (1) after Claim 1 , characterized in that the edge layers (2) are each formed of a standard aluminum material, in particular of an aluminum alloy with a lower silicon content than the core layer (3). Metal multilayer material (1) according to one of the preceding claims, characterized in that the edge layers (2) each have a greater thickness than the core layer (3). Metal multilayer material (1) after Claim 3 , characterized in that the aluminum alloy of the core layer (3) has a silicon content adjusted to the thickness ratio. Metal multilayer material (1) according to one of the preceding claims, characterized in that the silicon content of the aluminum alloy of the core layer (3) is dimensioned such that the silicon content in the weld metal is at least two percent by weight. Metal multilayer material (1) according to one of the preceding claims, characterized in that the silicon content of the aluminum alloy of the core layer (3) is greater than eight percent by weight. Metal multilayer material (1) according to one of the preceding claims, characterized in that the edge layers (2) are each formed from an aluminum-6XXX alloy.

Images