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Vacuum electron beam welding method for magnesium alloy component

A technology of vacuum electron beam and welding method, applied in electron beam welding equipment, welding equipment, metal processing equipment and other directions, can solve problems such as inability to eliminate defects, and achieve good appearance, high welding quality consistency, and high welding yield. Effect

Active Publication Date: 2020-08-18
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process applies structure-loaded ultrasonic energy with a certain frequency and amplitude during the vacuum electron beam welding process. The ultrasonic frequency is 20-50kHz and the amplitude is 5-40μm. Continuous oscillation can effectively eliminate cavity-type defects such as pores and cold shuts during the welding process, and obtain high-quality welded joints, but ultrasonic waves are needed to assist, and defects cannot be eliminated only by vacuum electron beam welding

Method used

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  • Vacuum electron beam welding method for magnesium alloy component
  • Vacuum electron beam welding method for magnesium alloy component
  • Vacuum electron beam welding method for magnesium alloy component

Examples

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Effect test

Embodiment 1

[0035] Such as Figure 1 to Figure 3 As shown, the vacuum electron beam welding method of the magnesium alloy component of the embodiment of the present invention comprises the following steps:

[0036] 1) Selection of welded parts: the welded joint adopts a complete butt joint, and adopts a circular magnesium alloy blank; in this embodiment, 20 pieces of circular magnesium alloy blanks with an outer diameter of 130mm and an inner diameter of 20mm are electron beam welded;

[0037] 2) Cleaning of welded parts: Wipe and clean the magnesium alloy blank and complete butt joints, use clean white gauze dipped in acetone to wipe and clean each part of the welded parts, remove the oil film, water film and organic impurities on the surface to be welded, and clean the The surface is also not allowed to touch and recontaminate with hands;

[0038]3) Assembly: After cleaning, assemble and weld each welding part, and use special fixtures for assembly during assembly. The assembly gap is ...

Embodiment 2

[0049] The difference between this embodiment and above-mentioned embodiment one is only: 1) select 20 outer diameters to be 140mm for use, inner diameter is the magnesium alloy blank of 20mm; 2) welding speed V 0 Using 600mm / min, electron beam current L 0 Using 115.0mA, focusing current I 0 With 2.65A, the focus current I 1 = 3.35A.

[0050] The weld penetration depth of the magnesium alloy component obtained by the above-mentioned vacuum electron beam welding method is 55 mm to 60 mm, and the surface and subsurface of the weld seam have no pores, and the pores inside the weld seam and the arc closing pores are diffusely distributed, and the diameter of a single pore is less than 1.2mm. There are no cracks, slag inclusions and other welding defects in the weld, that is, the welding quality is better while obtaining a larger penetration depth.

Embodiment 3

[0052] The difference between this embodiment and above-mentioned embodiment one is only: 1) select 20 outer diameters to be 140mm for use, inner diameter is the magnesium alloy blank of 20mm; 2) welding speed V 0 Using 650mm / min, electron beam current L 0 Using 110.0mA, focusing current I 0 Using 2.60A, focus current I 1 = 3.30A.

[0053] The weld penetration depth of the magnesium alloy component obtained by the above-mentioned vacuum electron beam welding method is 55 mm to 60 mm, and the surface and subsurface of the weld seam have no pores, and the pores inside the weld seam and the arc closing pores are diffusely distributed, and the diameter of a single pore is less than 1.2mm. There are no cracks, slag inclusions and other welding defects in the weld, that is, the welding quality is better while obtaining a larger penetration depth.

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Abstract

The invention relates to a vacuum electron beam welding method for a magnesium alloy component. The method is characterized by comprising the following steps: (1) selecting a welding part; (2) cleaning the welding part, specifically, wiping and cleaning a magnesium alloy blank and a complete butt joint, and removing an oil film, a water film and organic impurities on the surface to be welded; (3)performing assembling; (4) adopting vacuum electron beam welding; and (5) performing circumferential seam welding. According to the vacuum electron beam welding method, a welding joint form, welding steps, technological parameters and welding defect control are given, air holes in the surface and the subsurface of a welding seam are eliminated, welding defects such as air holes in the welding seam, air holes in the root, arc extinguishing air holes and cold shut can be effectively controlled, in addition, the air holes in the welding seam and the arc extinguishing air holes are dispersedly distributed, the diameter of a single air hole is small, other welding defects such as cracks and slag inclusion do not exist in the welding seam, and the circumferential welding seam is good in appearance forming, consistent in welding quality and high in welding yield.

Description

technical field [0001] The invention relates to a vacuum electron beam welding method, in particular to a vacuum electron beam welding method for magnesium alloy components. Background technique [0002] Magnesium alloy has a series of unique advantages such as light specific gravity, high specific strength and specific stiffness, good damping and shock absorption performance, good machinability, good thermal conductivity, strong electromagnetic shielding ability, and easy recycling. Magnesium alloy structural materials are widely used to manufacture structural components It is one of the important ways to realize the lightweight structure. [0003] Due to the relatively active chemical properties of magnesium alloys, it is difficult to achieve high-quality welds with traditional fusion welding techniques, especially when welding magnesium alloys with large penetration depth welds, the weld defects are more prominent, and the welding performance is difficult to improve. The...

Claims

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Application Information

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IPC IPC(8): B23K15/06
CPCB23K15/06
Inventor 石磊马冰王雅仙王英赵健陆煜杜乐一
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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