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Plating assisting regulation type magnesium and steel dissimilar metal laser welding-brazing method

A technology of dissimilar materials and brazing methods, applied in welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve problems such as difficulty in flexible control of interlayer thickness, burning loss and evaporation of magnesium alloys, and large difference in melting and boiling points. Achieve the effect of stable and reliable welding process, reduce burning loss and evaporation, and easy wetting and spreading

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

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Problems solved by technology

[0004] Based on the performance advantages of the magnesium / steel composite structure, scholars at home and abroad have carried out a lot of research work on the connection of magnesium / steel dissimilar metals, but there are still the following deficiencies: due to the large difference in melting and boiling points between Mg and Fe, the large heat input will reduce the It leads to serious burning loss and evaporation of magnesium alloy, which makes it difficult to form the weld; because Mg and Fe are neither soluble nor reactive, by adding an interlayer (nickel interlayer, copper interlayer, tin interlayer) between the two, the magnesium / steel The joint produces metallurgical bonding, but because the thickness of the interlayer is difficult to flexibly control, and the existence of the interlayer requires high assembly accuracy, it is difficult to effectively control the compound at the interface of the joint

Method used

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  • Plating assisting regulation type magnesium and steel dissimilar metal laser welding-brazing method
  • Plating assisting regulation type magnesium and steel dissimilar metal laser welding-brazing method
  • Plating assisting regulation type magnesium and steel dissimilar metal laser welding-brazing method

Examples

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Embodiment 1

[0045] Step 1: Selection and processing of plates. Select a 1.5mm thick Q235 steel plate with a size of 50mm×100mm. Use silicon carbide sandpaper with a particle size of 360 to polish the steel plate to remove its surface oxide, and then use an ultrasonic cleaner in acetone to degrease and decontaminate. Choose 1mm thick AZ31 magnesium alloy, the size is 50mm×100mm. Before welding, grind the surface and side wall of the magnesium alloy plate with a winch mill to remove the oxide film existing on the surface.

[0046] Step 2: Nickel plating operation on the steel plate. The electroplating solution used for nickel plating consists of: nickel sulfate 200g / L, sodium chloride 9g / L, boric acid 32g / L, anhydrous sodium sulfate 70g / L, magnesium sulfate 65g / L. The process parameters of nickel electroplating can be: cathode current density 1 (A / dm2), pH of the plating solution is 5.5, and temperature of the plating solution is 35°C. Select a pure nickel plate with a purity of 99.9% a...

Embodiment 2

[0054] The difference between this embodiment and Example 1 is: step 2 nickel plating operation: the electroplating time is 120min, and the thickness of the nickel coating on the steel surface can be obtained to be 20 μm (micrometer), and the SEM image of the nickel-plated steel section is as follows Figure 5 As shown, the SEM image of the magnesium / nickel-plated steel joint interface in step 5 is as follows Figure 9 As shown, the average tensile shear force of the joint obtained in step 6 can reach 220N / mm, which is 85% of the tensile shear force of the magnesium alloy base metal. Others are the same as in Example 1.

Embodiment 3

[0056] The difference between this embodiment and Example 1 is: step 2 nickel plating operation: the electroplating time is 180min, the thickness of the nickel coating on the steel surface can be obtained to be 40 μm, and the SEM image of the nickel-plated steel section is as follows Image 6 As shown, the SEM image of the magnesium / nickel-plated steel joint interface in step 5 is as follows Figure 10 As shown, the average tensile shear force of the joint obtained in step 6 is 195N / mm, which is 72% of the tensile shear force of the magnesium alloy base metal. Others are the same as in Example 1.

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Abstract

The invention provides a plating assisting regulation type magnesium and steel dissimilar metal laser welding-brazing method and particularly relates to preparation of plating assisting regulation type welding materials. The problems of easiness in causing weld joints, difficulty in shaping control, magnesium alloy melting loss and low bonding strength at the joint interfaces of an existing magnesium alloy and steel welding method are to be solved. The plating assisting regulation type magnesium and steel dissimilar metal laser welding-brazing method includes electroplating nikel on the surface of steel, and welding according to a laser welding-brazing method by adjusting the technological parameters such as wire feed positions and angles, laser beam positions and defocusing amount. In the presence of the nickel plating on the surface of the steel, metal droplets wet and spread easily during welding, and weld joints are alloyed through addition of nickel elements to generate an intermetallic compound and a reaction layer at the interface, so that the weld joints excellent in shaping and performance can be obtained. The plating assisting regulation type magnesium and steel dissimilar metal laser welding-brazing method solves the key and common problems about inhibiting improvement in welding quality of immiscible dissimilar metals such as Mg / Fe and widens the application range of laser welding-brazing.

Description

technical field [0001] The invention belongs to the technical field of material engineering, and relates to a welding method for dissimilar metals, in particular to the preparation of welding materials assisted by plating. Background technique [0002] Magnesium and its alloys are known as green engineering materials in the 21st century because of their low density, high specific strength, and high specific stiffness. Steel is currently the most widely used metal material in industry. If the reliable connection between magnesium alloy and steel can be realized, the advantages of both will be fully utilized, and the process of lightweighting in industrial production will be promoted. [0003] There are huge differences between magnesium alloys and steel in terms of physical and chemical properties. The boiling point of magnesium alloy (1100°C) is much lower than the melting point of steel (1515°C), and the melting point of magnesium alloy is only 660°C, which leads to the f...

Claims

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Application Information

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IPC IPC(8): B23K1/005B23K1/20B23K1/19B23K103/18
CPCB23K1/005B23K1/19B23K1/206B23K2103/18
Inventor 檀财旺陈波肖力源宋晓国冯吉才
Owner HARBIN INST OF TECH AT WEIHAI
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