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Magnesium/titanium laser melting braze welding method assisted by nickel-plated layer

A welding method and nickel coating technology, which is applied in the field of magnesium/titanium laser welding, can solve the problems of difficult metallurgical reaction, low joint strength, and difference in melting point, etc., and achieve the effect of facilitating wetting and spreading, low cost, and reducing alignment requirements

Inactive Publication Date: 2017-01-04
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of large difference in melting point, difficult metallurgical reaction and low joint strength when welding magnesium / titanium dissimilar metals, and proposes a method of using nickel coating to assist magnesium / titanium laser welding. method

Method used

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  • Magnesium/titanium laser melting braze welding method assisted by nickel-plated layer
  • Magnesium/titanium laser melting braze welding method assisted by nickel-plated layer
  • Magnesium/titanium laser melting braze welding method assisted by nickel-plated layer

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Experimental program
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Effect test

Embodiment 1

[0032]Example 1: The base materials are AZ31B magnesium alloy and Ti-6Al-4V titanium alloy, and the size is 100×50×1 mm.

[0033] (1) Plate treatment: Use hydrochloric acid with a mass fraction of 36 to 38%, hydrofluoric acid with a mass fraction of 40%, and pickling solutions with a volume fraction of 15% hydrochloric acid, 5% hydrofluoric acid, and 80% distilled water to clean titanium Plate for 2 to 3 minutes, then rinse with alcohol and dry for use; use an angle grinder to polish the magnesium plate to remove the oxide film;

[0034] (2) Titanium plate electroplating process: according to the mass concentration of NiSO 4 ·6H 2 O 200 g / L, NaCl 10 g / L, H 3 BO 3 32 g / L, Na 2 SO 4 72 g / L, MgSO 4 ·7H 2 O 60 g / L is equipped with electroplating solution, the nickel plate is used as the anode, and the titanium plate is used as the cathode. During electroplating, the pH value is controlled at 5.0, the temperature is 35°C, the magnetic stirrer rotates at 250 r / min, and the ...

Embodiment 2

[0039] The difference between this embodiment and embodiment 1 is that the electroplating time is 60 min, and the others are the same as embodiment 1. The thickness of the obtained nickel coating is about 2 μm, and the scanning electron microscope photo of the nickel-plated titanium plate cross section is shown in image 3 As shown in part (b), the tensile test results of the magnesium / titanium joint show that the fracture occurs at the interface, and the joint strength is 211 N / mm.

Embodiment 3

[0041] The difference between this embodiment and embodiments 1 to 2 is that the electroplating time is 180 min, and the others are the same as embodiments 1 to 2. The thickness of the obtained nickel coating is about 6.5 μm, and the scanning electron microscope photo of the nickel-plated titanium plate cross section is as follows: image 3 As shown in part (f), the tensile test results of the Mg / Ti joint showed that the fracture occurred in the weld, and the joint strength was 220 N / mm.

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Abstract

The invention discloses a magnesium / titanium laser melting braze welding method assisted by a nickel-plated layer. The method is applicable to the field of dissimilar metal welding and is used for solving the problems of no occurrence of metallurgic reaction and great melting point difference between the existing magnesium / titanium. The method is characterized in that firstly, nickel is electroplated on a titanium plate subjected to acid cleaning is used as a middle layer; then, a lap joint mode that a magnesium plate is positioned at the upper part and the titanium plate is positioned at the lower part is used; meanwhile, high-pure argon gas is used for positive and opposite side protection; the magnesium / titanium connection is realized through magnesium alloy wire filling. The method has the advantages that the moistening spreading capability of the magnesium alloy on the titanium plate is effectively improved; joints without obvious defects can be obtained; the tensile strength can reach 243 N / mm; the joint efficiency is 90 percent of a magnesium plate; higher practical values are realized.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a magnesium / titanium laser welding method in which an intermediate layer is added through electroplating. Background technique [0002] Human beings pay more and more attention to the protection of resources and the environment, and lightweight is an important way to achieve energy saving and emission reduction and promote sustainable development. Titanium alloys have been widely used in the aviation industry as structural parts. Realizing a reliable connection between magnesium and titanium is not only a prerequisite for lightweight applications, but also lays the foundation for expanding the application of magnesium alloys in the aerospace field. However, the melting points of magnesium and titanium differ greatly, which are 649°C and 1678°C respectively, while the boiling point of magnesium is 1091°C, which is much lower than the melting point of titanium. Therefo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/005B23K1/20
CPCB23K1/0056B23K1/206
Inventor 檀财旺陈波卢清爽冯吉才
Owner HARBIN INST OF TECH AT WEIHAI
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