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Fusion welding method for magnesium and aluminium dissimilar metals

A dissimilar metal and aluminum alloy welding wire technology, which is applied in the field of welding between dissimilar metals and fusion welding between magnesium and aluminum dissimilar metals, can solve the problems of joint brittleness and low strength, and achieve joint strength improvement, high welding efficiency and low cost. low effect

Inactive Publication Date: 2005-09-07
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the presence of brittle compounds in the welded fusion zone is the main cause of joint brittleness and lower strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Using a low-magnesium aluminum alloy welding wire with a diameter of 3 mm and a magnesium content of 2.0% to 2.5%, the electromagnetic pulse AC tungsten arc welding is performed on the outer corner joints of the magnesium plate and the aluminum plate with a thickness of 10 mm. Before welding, use acetone to remove the oil on the surface of the welding wire, and then use 15% NaOH solution to clean it for 15 minutes at 25°C ± 5°C, then rinse it with water, then wash it with 30% nitric acid solution, and then wash it with water for 60 minutes. ℃ drying. Welding process parameters are: base value current 70A~100A, pulse current 220A~320A, pulse duration 6s~9s, welding voltage 25V, welding speed 1.4mm / s~1.7mm / s, argon flow 15L / min~18L / min.

[0021] During the welding process, keep the welding torch and the horizontal plate of the fillet weld at an angle of 45°, the inclination angle between the welding wire and the weldment of the horizontal plate is kept at 15°-20°, the d...

Embodiment 2

[0023] The low-magnesium aluminum alloy welding wire with a diameter of 2 mm and a magnesium content of 1.5% to 2.0% is used to perform electromagnetic pulse AC tungsten arc welding on the butt joints of a magnesium plate and an aluminum plate with a thickness of 6 mm. Before welding, use acetone to remove the oil stain on the surface of the welding wire, then use 15% NaOH solution to clean for 12 minutes at 25°C ± 2°C, rinse with water, then wash with 30% nitric acid solution, rinse with water and dry at 50°C . Welding process parameters are: base value current 80A~110A, pulse current 200A~260A, pulse duration 5s~8s, welding voltage 25V, welding speed 1.3mm / s~1.5mm / s, argon gas flow rate 12L / min~15L / min.

[0024] During the welding process, the welding torch is perpendicular to the weldment, the distance between the nozzle and the workpiece is 9mm, the extension length of the tungsten electrode is 6mm, the inclination angle between the welding wire and the weldment is kept ...

Embodiment 3

[0026] Using low-magnesium aluminum alloy welding wire with a diameter of 2mm and a magnesium content of 2.0% to 2.5%, the electromagnetic pulse AC tungsten argon arc welding is performed on the butt joints of magnesium tubes and aluminum tubes with a wall thickness of 4mm and an outer diameter of the nozzle of 60mm. Before starting the arc, pass argon gas for 20-30 seconds to remove the air in the tube. During the whole welding process, the tube is always filled with argon gas with a purity of 99.95% for protection.

[0027] The cleaning of the low-magnesium aluminum alloy welding wire before welding is the same as in Example 1. Welding process parameters are: base value current 60A~100A, pulse current 200A~240A, pulse duration 5s~7s, welding voltage 24V, welding speed 1.1mm / s~1.3mm / s, argon flow 10L / min~12L / min.

[0028] During the welding process, the tungsten electrode sticks out to 5mm, the distance between the nozzle and the workpiece is 8mm, keep the pipe rotating, t...

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Abstract

The invention discloses a fusion welding of magnesium and Al heterogeneous metals, which adopts low magnesium Al alloy weld stick as the filling materials, the indifferent gas to protect, the electromagnetic pulse AC tungsten Ar arc to weld magnesium and Al. there into, the mass percentages of the weld stick are: magnesium is 0.5-3.0% with 2.0-3.0mm diameter; the said indifferent gas is Ar gas with purity more than 99.9%; the parameter of the tungsten Ar arc welding is: the basic current is 50-130A, the impulse current is 200-350A, the impulse time is 5-10s, the impulse frequency is 35-75Hz, the welding voltage is 24-26V, the welding speed is 1.0mm / s-1.8mm / s, the Ar gas flux is 10-18L / min, the extension length of the tungsten polar is 5-6mm, the distance between the welding torch jet and the working piece is 6mm-10mm, the thickness of the working piece is 1.5mm-14mm. the invention has high welding efficiency, low cost, convenient operation, and is suitable for the manufacturing of magnesium-Al heterogeneous compound structure.

Description

technical field [0001] The invention relates to a welding method between dissimilar metals, in particular to a fusion welding method between magnesium and aluminum dissimilar metals, and belongs to the field of welding technology. Background technique [0002] With the development of contemporary science and technology, people put forward higher and higher requirements for the performance of materials. It is difficult for traditional single materials to meet the comprehensive performance requirements of modern engineering structures. New dissimilar materials welded structures have attracted widespread attention. Active metal magnesium, aluminum and their alloys are light metals used in high-tech fields such as aviation, electronics, and communications, and are one of the new materials that the country has focused on developing in recent years. [0003] For the performance requirements of some special occasions, connecting magnesium and aluminum to form a composite structure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/09B23K9/16B23K9/23B23K9/235B23K35/24
Inventor 李亚江王娟刘鹏
Owner SHANDONG UNIV
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