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Soldering flux filled type pulse welding method for magnesium alloy pipe fitting

A pulse welding and magnesium alloy technology, applied in welding equipment, welding medium, welding equipment, etc., can solve the problems of difficult to realize magnesium alloy pipe structure and complex joint connection, difficult to meet the use requirements, difficult to weld magnesium alloy pipe fittings, etc., to achieve Convenient and flexible application, improved welding quality and high welding efficiency

Inactive Publication Date: 2015-04-29
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, friction stir welding has strict positioning of the workpiece, and it is difficult to realize the connection of magnesium alloy pipe structures and complex joints
Electron beam welding and diffusion welding are also difficult to realize the welding of magnesium alloy pipe fittings. Brazing can realize the connection of magnesium alloy pipes, but the joint strength is low and it is difficult to meet the use requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Butt welding of MB2 magnesium alloy pipe fittings with an outer diameter of 40mm and a wall thickness of 4mm. The length of the connected pipe is 160mm. The welding equipment is American Miller Auto-Axcess 350 advanced digital pulse argon arc welding machine.

[0024] Magnesium alloy welding wire with a diameter of 2.0mm is used. Before welding, use acetone to remove the oil on the surface of the welding wire, and then polish the welding wire with fine sandpaper to reveal the metallic luster. The diameter of the tungsten electrode is 2.0mm. The protective gas is a mixed gas of 75% Ar+25% He, and the purity of both argon and helium is greater than 99.9%.

[0025] The chemical composition of the flux is (mass percentage): potassium chloride 46%, sodium chloride 26%, lithium chloride 18%, lithium fluoride 10%. Mix the powder flux and alcohol into a paste according to the above ratio, apply it evenly on the joints of magnesium alloy pipe fittings, and dry naturally. The...

Embodiment 2

[0031] Using magnesium alloy welding wire with a diameter of 3.0mm, butt welding is performed on MB3 magnesium alloy pipe fittings with an outer diameter of 100mm and a wall thickness of 6mm, and the length of the connected pipe fittings is 240mm. A single-sided 55° V-shaped groove is made at the joint of the pipe fittings, and the welding equipment is the American Miller Auto-Axcess 350 advanced digital pulse argon arc welding machine.

[0032] Before welding, use acetone to remove the oil on the surface of the welding wire, and then polish the welding wire with fine sandpaper to reveal the metallic luster. The magnesium alloy pipe fittings were cleaned with an aqueous solution of 15% NaOH by mass at 20°C to 25°C for 12 minutes, rinsed with clean water, and then washed with an aqueous solution of 30% nitric acid by volume, rinsed with water, and dried at 40°C.

[0033] The diameter of the tungsten electrode is 2.0mm. The protective gas is a mixed gas of 75% Ar+25% He, and th...

Embodiment 3

[0039] The magnesium alloy welding wire with a diameter of 3.0mm is used to butt weld the MB3 magnesium alloy pipe fittings with an outer diameter of 100mm and a wall thickness of 6mm, and the length of the connected pipe fittings is 240mm. The joints of the pipe fittings are made with a single-sided 55°V-shaped groove, and the welding equipment is the American Miller Auto-Axcess 350 advanced digital pulse argon arc welding machine.

[0040] Before welding, use acetone to remove the oil on the surface of the welding wire, and then polish the welding wire with fine sandpaper to reveal the metallic luster. For magnesium alloy pipe fittings, wash with 15% NaOH aqueous solution at 20°C to 25°C for 12 minutes, rinse with clean water, then wash with 30% by volume nitric acid aqueous solution, rinse with water and then dry at 40°C.

[0041] The diameter of the tungsten pole is 2.0mm. The protective gas is a mixed gas of 75% Ar+25% He, and the purity of both argon and helium is great...

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Abstract

The invention relates to a soldering flux filled type pulse welding method for a magnesium alloy pipe fitting. The method comprises the steps of adding alcohol to soldering flux powder to prepare into paste; uniformly coating to a connector of the magnesium alloy pipe fitting; naturally drying or blowing drying with cold air; butting the aluminum alloy pipe fittings to be welded; welding with magnesium alloy welding wires as filling materials under the protection of inert gases of Ar and He by the pulsed tungsten inert gas protective welding process; the soldering flux is prepared from the following components in percentage by weight: 40 to 50% of potassium chloride, 20 to 30% of sodium chloride, 15 to 25% of lithium chloride, and 5 to 10% of lithium fluoride. According to the soldering flux filled type pulse welding method for the magnesium alloy pipe fitting, the welding efficiency is high, the application is convenient and flexible, and a welding joint without crack, bubble and other defects can be obtained.

Description

technical field [0001] The invention relates to a non-ferrous metal welding method, in particular to a pulse inert gas shielded welding method of magnesium alloys, and belongs to the technical field of welding. Background technique [0002] Magnesium and magnesium alloys have low density (1.738g / cm 3 ), high specific strength, good shock absorption, abundant reserves and other characteristics, the development and application of magnesium alloys in aerospace, automobile, electronic communication and military equipment and other fields have attracted attention from all over the world in recent years. [0003] Magnesium has high vapor pressure and is easy to be oxidized. The welding difficulties of magnesium and magnesium alloys are mainly hot cracks, oxidation, lack of fusion and pores, and easy burn-through. With the development of structural lightweighting and welding technology, the application of magnesium alloys has been paid more and more attention, and new welding meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K9/23B23K35/362B23K35/28B23K35/38
CPCB23K9/167B23K9/23B23K35/284B23K35/362B23K35/383
Inventor 李亚江王娟
Owner SHANDONG UNIV