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Rapid welding method for steel and aluminum or aluminum alloy

A rapid welding and aluminum alloy technology, which is applied in the field of welding of dissimilar metals, rapid welding of steel and aluminum or steel and aluminum alloy, can solve expensive problems, achieve low cost, easy promotion and application, and stable interface combination

Inactive Publication Date: 2013-05-22
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other welding methods for steel and aluminum (such as laser welding, laser-arc hybrid welding, etc.) have cost problems. If mechanized welding technology is used, more expensive equipment needs to be purchased.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1 Rapid Welding of Steel and Aluminum Alloy

[0021] The low-carbon steel plate with a thickness of 1mm and the rust-proof aluminum plate (3A21) with a thickness of 1mm are lap welded. The length of the welded low-carbon steel plate and the aluminum plate are 120mm and 80mm respectively.

[0022] The specific welding process steps are as follows:

[0023] (1) Before welding, place the anti-rust aluminum plate 3A21 and Al-Si diaphragm solder in a 30% nitric acid aqueous solution at 25°C (with a concentration of 60% HNO 3 + pure water preparation), dipping for 8-12min (12min for aluminum plate, 8min for membrane-shaped Al-Si brazing material), remove the oil stain and oxide film on the surface, and then pass through 50℃ hot water, cold water (20℃ ) after rinsing, blow or dry with hot air; the low-carbon steel plate to be welded is polished with sandpaper until it reveals a metallic luster.

[0024] (2) Put a film-shaped Al-Si solder (Si 12.0%, Cu 0.20%, Zn 0.15%...

Embodiment 2

[0028] Example 2: Rapid Welding of Steel and Aluminum

[0029] The low-carbon steel plate with a thickness of 1.5mm and the pure aluminum plate (1060) with a thickness of 1.5mm are lap welded. The length of the welded low-carbon steel plate and the pure aluminum plate are 160mm and 120mm respectively.

[0030] The specific welding process steps are as follows:

[0031] (1) Before welding, put the pure aluminum plate 1060 and the Al-Si diaphragm solder in the nitric acid aqueous solution with a volume percentage of 30% at 30°C (with a concentration of 60%HNO 3 + pure water preparation), dipping for 8-12min (12min for aluminum plate, 8min for membrane-shaped Al-Si brazing material) to remove the oil stain and oxide film on the surface, and then through 60℃ hot water, cold water (15℃ ) after rinsing, blow dry or tumble dry with hot air. The low-carbon steel plate to be welded is polished with sandpaper until the metallic luster is exposed.

[0032] (2) Put a film-shaped Al-Si ...

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Abstract

The invention discloses a rapid welding method for steel and aluminum or aluminum alloy. The rapid welding method includes the following steps: (1), clearing away oil stain and oxide film on the surfaces of steel plates, aluminum plates and Al-Si brazing filler metal before welding; (2), placing sheet Al-Si brazing filler metal with an oxide-film-removed surface between to-be-welded faces of the steel plates and the aluminum plates; (3), adopting alternating-current resistance mash welder; and (4), naturally cooling joints of the steel and the aluminum after finishing welding. In the rapid welding method, dissimilar metals like the steel and the aluminum are adopted, the Al-Si brazing filler metal are added to realize overlap welding of the steel plates and the aluminum plates, so that formed overlap joint interfaces of the steel and the aluminum plates are bonded stably, and bonding quality is reliable. By adopting the Al-Si brazing filler metal, overlap joints of the steel and the aluminum with high interface bonding strength can be produced. Tests prove that shear strength of the overlap joints of the steel and the aluminum is greater than 80 MPa (million pascal), extension strength is greater than 140 MPa, and quality requirements of light-weight engineering structures on the overlap joints of the steel and the aluminum can be met.

Description

technical field [0001] The invention relates to a welding method of dissimilar metals, in particular to a rapid welding method of steel and aluminum or steel and aluminum alloy, and belongs to the technical field of welding of metal materials. Background technique [0002] Welding steel and aluminum is very difficult. Even in today's advanced technology and welding technology, it is still very difficult to achieve reliable welding of steel and aluminum and obtain industrial applications. People have tried many ways to weld steel and aluminum together. The welding methods used include diffusion welding, explosive welding, resistance welding, laser welding, laser-arc hybrid welding, etc., but it is still difficult to obtain satisfactory results and stable quality. Welded joints, or there are defects in weld seam formation, or extremely high requirements for welding equipment and operating skills. [0003] The melting point of low-carbon steel is 1650°C, while the melting poin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/11B23K11/20B23K11/34B23K35/28
Inventor 李亚江王娟魏守征
Owner SHANDONG UNIV
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