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Method for welding aluminum-steel by pre-placing Al coating on steel surface

A coating and preset technology, applied in the field of aluminum-steel welding, can solve problems such as poor wetting, poor joint connection quality, and many pores in the joint, so as to improve the wettability of the interface, good weld formation, and no The effect of slag undercut

Inactive Publication Date: 2009-11-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor wetting of aluminum to steel surface in existing aluminum-steel welding, many joint pores, and poor connection quality of joints, and to provide a method for realizing aluminum alloy welding by plating Al coating on steel surface. - Methods of steel welding

Method used

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  • Method for welding aluminum-steel by pre-placing Al coating on steel surface
  • Method for welding aluminum-steel by pre-placing Al coating on steel surface
  • Method for welding aluminum-steel by pre-placing Al coating on steel surface

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specific Embodiment approach 1

[0008] Specific Embodiment 1: This embodiment adopts the method of pre-setting Al coating on the steel surface to realize aluminum-steel welding according to the following steps: 1. Pre-setting Al coating on the surface of the steel plate or steel pipe to be welded by the hot-dip aluminizing method , to obtain Al-plated steel plate or steel pipe; 2. Use acetone to clean the surface of the aluminum plate or aluminum tube, Al-plated steel plate or steel pipe to be welded, then lap or socket the parts to be welded together, and use MIG welding machine for welding , the protective atmosphere is argon or helium. During the welding process, the welding wire is fed to the outer surface of the aluminum plate or aluminum tube to be welded, and the distance between the welding wire and the edge of the aluminum plate or aluminum tube is ≤ 3mm. The aluminum plate or aluminum tube is kept welded during the welding process. Part of it is in liquid state, and the Al-plated steel plate or stee...

specific Embodiment approach 2

[0011] Embodiment 2: This embodiment differs from Embodiment 1 in that the thickness of the Al coating in step 1 is 50 μm. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0012] Embodiment 3: This embodiment is different from Embodiment 1 in that the thickness of the Al coating in step 1 is 200 μm. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention relates to a method for welding aluminum-steel, in particular to a method for welding aluminum-steel by pre-placing an Al coating on the steel surface. The invention solves the problems that the existing aluminum is poor at wetting the surface of steel, and the connector is prone to excessive pores and poor at the connection quality. The method comprises the following steps: (1) pre-placing the Al coating on the surface of a part to be welded on a steel plate or a steel pipe by the Aldip process to obtain an Al steel plate or an Al steel pipe; (2) carrying out the surface cleaning on the parts to be welded on an aluminum plate or an aluminum pipe and an Al-coated steel plate or an Al-coated steel pipe with acetone, then, lapping or muff coupling the parts to be welded together, and welding by an MIG (Metal Inert Gas) welding machine, so as to complete the aluminum-steel welding process. By taking Al as the coating of the surface of a steel plate or a steel pipe, the invention improves the interfacial wettability of melting aluminum to steel, ensures the low generation amount of interfacial compounds and the good welding line formation, prevents the slag inclusion from undercutting and the pores from generating, and improves the connection quality of the connector.

Description

technical field [0001] The invention relates to an aluminum-steel welding method. Background technique [0002] The connection of aluminum and steel has a very wide range of application requirements in the industrial field, but the connection of these two materials is very difficult. At present, there are three main methods of connecting aluminum and steel: pressure welding, vacuum brazing and fusion welding: pressure welding is only suitable for large-area butt joints of plates, and its scope of application is limited; vacuum brazing requires high equipment and low efficiency; fusion welding relies on Its advantages such as simple equipment, high production efficiency and stable quality have become one of the preferred methods in the industrial field. [0003] It is difficult to use MIG (melting inert gas shielded welding) welding equipment to achieve direct welding of aluminum and steel. This is mainly due to the poor wettability of molten aluminum to steel. For this reas...

Claims

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Application Information

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IPC IPC(8): B23K9/173B23K9/235B23K9/12
Inventor 曹健王军冯吉才张丽霞何鹏李卓然
Owner HARBIN INST OF TECH