Magnesium-lithium alloy laser welding method and composite protective gas adopted by same
A magnesium-lithium alloy, laser welding technology, applied in laser welding equipment, welding medium, welding equipment and other directions, can solve the problem that the shielding gas is difficult to meet the high-quality welding requirements of magnesium-lithium alloy, oxygen absorption and oxidation, collapse, etc. , Reduce the probability of oxidation, the effect of reducing the pores inside the weld
Active Publication Date: 2020-03-06
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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Problems solved by technology
However, for magnesium-lithium alloys, which are extremely oxidizable metal materials, when using industrial-grade Ar gas protection with a purity of more than 99.9%, it is very easy to absorb hydrogen and oxygen to oxidize during the welding process.
[0006] In view of the current laser welding of magnesium-lithium alloys, it is very easy to produce welding defects such as pores, cracks, and collapses due to oxidation problems, and the existing shielding gas is difficult to meet the high-quality welding requirements of magnesium-lithium alloys.
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[0030] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The detailed description and accompanying drawings of the following embodiments are used to illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention, that is, the present invention is not limited to the described embodiments, without departing from the spirit of the present invention Any modification, substitution and improvement of parts, components and connection methods are covered under.
[0031] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will refer to the attached figure 1 - attached image 3 The present application will be described in detail in conjunction with the embodiments.
[0032] A composite shielding gas for laser welding acc...
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Abstract
The invention relates to a magnesium-lithium alloy laser welding method and a composite protective gas adopted by the same. The composite protective gas comprises uniformly mixed helium gas, argon gasand sulfur hexafluoride gas. The magnesium-lithium alloy laser welding method comprises the following steps: splicing two magnesium-lithium alloy workpieces to be welded together to form a welding seam to be welded; arranging a vent groove at the lower end of the welding seam, and arranging a vent pipe for connecting protective gas is arranged in the vent groove; laying a layer of magnesium-lithium alloy powder on the breather pipe; and carrying out laser welding by adopting a laser welding mode under the protection of the protective gas. The conditions of oxidation of the surface of the magnesium-lithium alloy welding seam and collapse of the welding seam are obviously improved, air holes in the welding seam are obviously reduced, and the quality of the welding seam is obviously improved.
Description
technical field [0001] The invention relates to the technical field of magnesium-lithium alloy laser welding, in particular to a magnesium-lithium alloy laser welding method and a composite shielding gas used therefor. Background technique [0002] As the lightest metal functional material, magnesium-lithium alloy has the characteristics of low density, high specific strength, high specific stiffness, good damping and shock absorption, and good electronic shielding. It is considered to be an ideal structural weight reduction in the fields of military industry, aerospace, automobiles and electronic products. Material. With the continuous expansion of the application field of magnesium alloy structural parts, it is imminent to solve the connection problem of magnesium-lithium alloy. Therefore, it has also received great attention and attention. [0003] The main components of magnesium-lithium alloys generally include magnesium, lithium, aluminum, zinc, iron, gold and silico...
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Login to View More IPC IPC(8): B23K26/24B23K26/14B23K35/38
CPCB23K26/14B23K26/24B23K35/383B23K2103/15
Inventor 王彬段爱琴姜宽孔德夷
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST