A Laser Filler Welding Process of Magnesium/Al Dissimilar Metals

A dissimilar metal and filler welding technology, which is applied in laser welding equipment, metal processing equipment, welding/welding/cutting items, etc., can solve the problems of large heat input, welding deformation, and difficult to control the heating position, and achieve convenient and flexible operation , beautiful weld shape and high welding efficiency

Active Publication Date: 2020-04-14
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Arc welding is a commonly used fusion welding method, but its shortcomings of large heat input, difficult to control the heating position, and serious welding deformation make this method difficult to apply to the welding of magnesium alloys and aluminum alloys
Moreover, the boiling point of magnesium alloy is low (1096°C), and it is extremely easy to volatilize during the welding process, resulting in defects such as pores in the joint. Therefore, the heat input and the temperature field of the weldment must be strictly controlled during the welding process.

Method used

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  • A Laser Filler Welding Process of Magnesium/Al Dissimilar Metals
  • A Laser Filler Welding Process of Magnesium/Al Dissimilar Metals
  • A Laser Filler Welding Process of Magnesium/Al Dissimilar Metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Selection of welding consumables and intermediate layer

[0032] Magnesium alloy plate (ZEK100): size 60mm×50mm, thickness 1.5mm;

[0033] Aluminum alloy plate (AA5182): size 60mm×50mm, thickness 1.5mm;

[0034] Nickel foil: size 50mm×10mm, thickness 0.2mm, purity 99.9%;

[0035] Zn-Al alloy welding wire: diameter 1.6-2.0mm, the mass percentage of chemical elements in the wire is: Al 21.0%-23.0%, other elements 0.15-0.2%, and the rest is Zn; among them, other elements are Zn- Other components allowed in Al alloy welding wire have no effect on the welding reaction of the main components zinc and aluminum.

[0036]Flux: Superior No.20 (Superior Flux&Mfg.Co.), its composition mass percentage is: LiCl35%~40%, KCl 30%~35%, NaF 10%~21%, NaCl 8%~13%, ZnCl 2 6% to 10%.

[0037] 2. Preparation before welding

[0038] (1) Surface cleaning and flux solution preparation

[0039] Surface cleaning of the aluminum alloy plate: (1) soak the aluminum alloy plate in a 10% to 15%...

Embodiment 2

[0062] 1. Selection of welding consumables and intermediate layer

[0063] Same as Example 1.

[0064] 2. Preparation before welding

[0065] (1) Surface cleaning and flux solution preparation

[0066] The surface cleaning method and the preparation method of the flux solution are the same as in Example 1.

[0067] (2) Overlap

[0068] The overlapping method is the same as in Example 1, except that the difference from Example 1 is that the length of the overlapped joint between the nickel foil inserted into the magnesium alloy plate and the aluminum alloy plate is 6 mm, and the remaining 4 mm extends out of the magnesium alloy plate and the aluminum alloy plate. Overlapped joints.

[0069] 3. Welding

[0070] The welding method is the same as in Example 1, except that the laser parameters are: laser power 2.4kW, welding speed 0.24m / min.

[0071] 4. Post-welding treatment

[0072] (1) Cooling after welding: the method is the same as in Example 1.

[0073] (2) Clean up a...

Embodiment 3

[0080] 1. Selection of welding consumables and intermediate layer: the same as in Example 1.

[0081] 2. Preparation before welding

[0082] (1) Surface cleaning and flux solution preparation: the surface cleaning method and flux solution preparation method are the same as in Example 1.

[0083] (2) Overlap

[0084] The lapping method is the same as in Example 1, except that the difference from Example 1 is that the length of the overlapping overlapping parts of the nickel foil inserted into the magnesium alloy plate and the aluminum alloy plate is 4 mm, and the remaining 6 mm extends out of the magnesium alloy plate and the aluminum alloy plate. Overlapped joints.

[0085] 3. Welding

[0086] The welding method is the same as in Example 1, except that the laser parameters are: laser power 2.0kW, welding speed 0.28m / min.

[0087] 4. Post-welding treatment

[0088] (1) Cooling after welding: the method is the same as in Example 1.

[0089] (2) Clean up after welding: the ...

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Abstract

The invention discloses a laser filler wire welding process of magnesium / aluminum dissimilar metal. The laser filler wire welding process comprises the steps that a nickel intermediate layer is sandwiched between a magnesium alloy and an aluminum alloy at a welding interface, and zinc-aluminum alloy solder which is in contact with the aluminum alloy and the nickel intermediate layer is added; thesurface of the zinc-aluminum alloy solder is coated with soldering flux, and laser melt-brazing welding is performed under a protective gas environment; and magnesium / aluminum welding heads composed of a zinc-nickel phase, a magnesium-nickel and aluminum-nickel phase are formed on both sides of the nickel intermediate layer. A zinc-aluminum alloy is used as a filling material, and a pure nickel foil is used as the intermediate layer; the degree of melting of the intermediate layer is controlled by adjusting laser process parameters; and the extension length of the intermediate layer is adjusted to obtain magnesium / aluminum alloy welding joints with attractive forming and no defect such as cracks. The laser filler wire welding process of the magnesium / aluminum dissimilar metal can effectively control the production of brittle intermetallic compounds due to the metallurgical reaction products of magnesium and aluminum, the reliability of the magnesium / aluminum alloy welding joints is improved, and the requirements of use of magnesium alloy and aluminum alloy dissimilar metal welding joints.

Description

technical field [0001] The invention belongs to the field of welding technology, and relates to a laser filler welding process of magnesium / aluminum dissimilar metals, which is used for the connection between magnesium alloy components and aluminum alloy components. Background technique [0002] Aluminum alloy is widely used in the industrial field because of its advantages such as low density, high specific strength, non-magnetic, excellent corrosion resistance, good formability, and low temperature resistance. Magnesium alloy is a kind of material with a lower density than aluminum alloy. Metal materials have high specific strength and specific stiffness, excellent electromagnetic shielding performance, and are also widely used in industrial fields. The welding process of two light materials, magnesium and aluminum, which are widely used in the industrial field, is inevitable. However, due to their respective physical and chemical properties and the differences in propert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/211B23K26/12B23K26/32B23K26/60B23K103/18
CPCB23K26/123B23K26/211B23K26/32B23K26/60
Inventor 杨瑾于治水赵万芹张天理苏佳浩
Owner SHANGHAI UNIV OF ENG SCI
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