Method for directly welding aluminum and non-coating steel

A kind of coated steel, direct technology, applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problem that there is no public technology and literature for welding aluminum and steel, so as to reduce the manufacturing process and cost, and improve the quality of the weld surface Good, simple welding process

Inactive Publication Date: 2010-08-18
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] According to the above literature search, no public technology and literature data of welding aluminum and steel using the method described in this patent application have been found.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1. TIG welding of aluminum and uncoated steel dissimilar materials

[0031] The aluminum alloy used is a 2mm thick 5A02 aluminum alloy plate, the uncoated steel is a 1.5mm thick 304 stainless steel plate, the welding method is tungsten inert gas (TIG) welding, and the welding wire is 15% aluminum ) Zinc-based flux-cored wire. The welding process steps are as follows:

[0032] (1) Before welding, use acetone to remove the oil on the surface of the workpiece, and use a stainless steel wire brush to remove the oxide film on the surface of the workpiece to be welded;

[0033] (2) Clamp the workpiece to be welded on the fixture of the workbench, the joint adopts the form of lap joint, the aluminum plate is on the top, the stainless steel is on the bottom, and the lap width is 18mm;

[0034] (3) The diameter of the tungsten electrode used is 3.2mm, the angle between the tip of the tungsten electrode is 30°, the welding current is 40A, and the flow rate of argon g...

Embodiment 2

[0038] Example 2. MIG welding of dissimilar materials between aluminum and uncoated steel

[0039] (1) Before welding, use acetone to remove the oil on the surface of the workpiece, and use a stainless steel wire brush to remove the oxide film on the surface of the workpiece to be welded;

[0040] (2) Clamp the workpiece to be welded on the fixture of the workbench, the joint adopts the form of lap joint, the aluminum plate is on the top, the stainless steel is on the bottom, the lap width is 18mm, and the diameter of the flux-cored welding wire used is 1.6mm;

[0041] (3) The welding current is 20-80A, the welding voltage is 5-26V, the argon gas flow rate is 12L / min, and the welding torch is tilted forward by 10°-15°;

[0042] (4) Align the end of the flux-cored wire with the edge of the aluminum alloy at the overlapping part, start the welding switch, and the welding process begins;

[0043] (5) Apply welding to the end of the workpiece at a walking speed of 30-90mm / min, tu...

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Abstract

The invention relates to a method for directly welding aluminum and non-coating steel, belonging to the technical fields of material processing and manufacturing engineering. The method is characterized in that when heterogeneous metals which are the aluminum and the steel are welded, the surface of the steel is not needed to be plated with intermediate layer metal or coated with soldering flux in advance; tungsten electrode gas shielded welding or melting electrode gas shielded welding technique is adopted, and a welding wire obtained by the technique is a flux-cored wire which is filled with soldering flux inside zinc base alloy material; the welding wire contains the aluminum with the mass percent of 0.1-30%; the filled soldering flux is cesium aluminum tetrafluoride with the mass percent of 10-20%; and the method can realize direct welding between the aluminum as well as aluminium alloy and the non-coating steel. The method has the advantages that a manufactured aluminum-steel heterogeneous metal joint has the tensile strength which is more than 80% of the tensile strength of aluminium alloy parent metal; and the method has simple technique, saves the energy consumption, reduces the manufacturing process and the cost, and is widely applied to welding between heterogeneous metal products, namely, between aluminum as well as aluminium alloy and iron-based materials such as the non-coating steel, cast iron and the like.

Description

technical field [0001] The invention belongs to the technical field of material processing and manufacturing engineering, and relates to the welding technology of dissimilar materials between aluminum and non-coated steel, in particular to the flux-cored wire gas shielded welding of aluminum and non-coated steel. Background technique [0002] At present, explosive welding, friction welding, brazing and other methods are widely used in the direct welding technology of aluminum and steel. Alternatively, a transition layer metal such as zinc or aluminum is first coated on the steel surface, and then the aluminum and the coated steel are welded. Explosion welding and friction welding have special requirements on the type of welded joints, and can only weld workpieces of a certain shape [Documents 1-2]. When aluminum and steel are brazed, generally a layer of flux is applied on the surface of the steel first, and then the solder is used for furnace brazing or arc melting brazing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/23B23K35/368B23K35/28
Inventor 董红刚杨丽群董闯
Owner DALIAN UNIV OF TECH
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