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Step-by-step friction stir brazing method for thick aluminium plate and rigid dissimilar material

A dissimilar material, friction stir technology, applied in welding equipment, welding equipment, non-electric welding equipment, etc., can solve problems such as low joint strength, poor film removal and mixing, heating and pressure, and insufficient interface torsion, etc., to achieve high joint strength Effect

Active Publication Date: 2012-06-27
西安英特金属复合材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0039] The purpose of the present invention is to solve the problem of insufficient heat and pressure on the side interface of the hard base material and insufficient interface torsion when the needleless friction stir brazing technology is used for "thick aluminum plate" to directly contact the hard dissimilar base material (such as steel, stainless steel, titanium, copper, etc.) , film removal and poor mixing lead to extremely low joint strength (for example, although the aluminum side interface is well removed and welded, it will still crack on its own during the sample preparation process with a hand saw after welding or the sample preparation stage will be along the self-cracking of the interface on the hard dissimilar material side) fatal problem

Method used

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  • Step-by-step friction stir brazing method for thick aluminium plate and rigid dissimilar material
  • Step-by-step friction stir brazing method for thick aluminium plate and rigid dissimilar material
  • Step-by-step friction stir brazing method for thick aluminium plate and rigid dissimilar material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Example 1: Step-by-step friction stir brazing technique between thick aluminum plate / stainless steel joints

[0063] As a feasibility test, in order to save test costs, the stainless steel plate (304) used is a thin plate with a thickness of 2mm and a size of 100mm×60mm. The thickness of the thick aluminum plate (1060) is 5mm; the thickness of the thin aluminum plate (1060) is 2mm; the size of the aluminum plate is also 100mm×60mm. The stirring tool is a needleless tool and a needle tool with a diameter of 20mm made of common 45 steel, respectively. The Zn foil is a commercially available 100 μm thick foil strip, and the width is also taken as 20 mm.

[0064] The welding process of the first layer is: as shown figure 1 (a) The method shown.

[0065] (1) Clamping method: The thin aluminum plate is clamped on the stainless steel plate (both plates are sanded and cleaned with alcohol), the brazing material Zn foil is placed between the two plates, and the stainless stee...

Embodiment 2

[0086] Example 2: Step-by-step friction stir brazing technology between thick aluminum plate / copper transition joints

[0087] Except that the 304 stainless steel plate was replaced by a copper plate (100mm×60mm×2mm in size), the materials, specifications and tools used were exactly the same as in Example 1.

[0088] The first step of welding process: the same method as in Example 1, a layer of thin aluminum plate is first brazed on the surface of the copper plate by using the needle-free friction stir brazing technology. Take a copper plate with a thickness of 2mm and a thin aluminum plate with a thickness of 2mm for the first step of brazing. The brazing material used is still Zn foil, and the welding speed is 150mm / min.

[0089] The second step of welding process: the same as the method in Example 1, the 5mm thick aluminum plate is welded on the thin aluminum plate of the thin aluminum / copper joint obtained in the first step with a needle tool, and the solder used is also Z...

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Abstract

The invention discloses a step-by-step friction stir brazing method for a thick aluminium plate and a rigid dissimilar material. The method can be used for avoiding various problems such as needle abrasion (when a tool with a needle is used), insufficient interface heat, poor mechanical membrane rupture effect and the like existing in the direct friction stir brazing process of the thick aluminium plate and the rigid dissimilar material (such as stainless steel, copper, titanium and steel). The method comprises the following steps of: firstly brazing a thin aluminium plate on the to-be-brazed surface of a rigid dissimilar material through needle-free friction stir brazing, striping by virtue of a metallurgical factor and a mechanical factor, and extruding brazing filler metal, thus realizing a compact joint between the thin aluminium plate and the rigid dissimilar material; and welding the thin aluminium plate brazed on the rigid dissimilar material and a thick aluminium plate through friction stir brazing or friction stir welding, wherein when friction stir brazing is utilized to weld lap joint in the second step, the welding-on area can be obviously enlarged. The process can be used for completely preventing rigid parent metal from abrading a tool; and the interface welding-on of the thin aluminium plate and the dissimilar material is reliable. The method disclosed by the invention can be used for preparing aluminium / stainless steel contact rails and aluminium / copper transition joints.

Description

Technical field: [0001] The invention belongs to the field of welding, and relates to a step-by-step friction stir brazing method, in particular to a step-by-step friction stir brazing method for thick aluminum plates and hard dissimilar materials. Background technique: [0002] At present, in the preparation of aluminum / stainless steel contact rails used in urban light rail, in order to improve the anti-vibration ability, eliminate sparks, and increase the conductive area, there is a demand trend for welding technology to replace traditional extrusion technology. However, the welding of aluminum and hard dissimilar materials (such as stainless steel, copper, titanium, steel) is an old technical problem, and a recognized high-quality and low-cost process has not been established so far. Moreover, as the plate thickness increases or the welding area increases, the difficulty of welding also increases. Take aluminum / stainless steel (Al / SUS) as an example, which is a typical d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/19B23K20/12B23K20/22
Inventor 张贵锋郝海张建勋
Owner 西安英特金属复合材料有限公司
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