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A double-sided welding, magnesium alloy technology, applied in welding equipment, welding/welding/cutting articles, metal processing, etc., can solve the problems of increasing hot cracks, weld metal slump, grain coarsening, etc., and achieve reduction Tendency of hot cracking, improvement of tensile strength, effect of improvement of mechanical properties
Active Publication Date: 2016-03-02
HARBIN INST OF TECH
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Problems solved by technology
However, magnesium and other elements are easy to form low melting point eutectic segregation in the grain boundary, which increases the tendency of hot cracks, and welded joints are prone to hot cracks in the brittle temperature range, so hot cracks are still the main problem in laser welding of magnesium alloys ;
[0008] (3) Magnesium alloys have high thermal conductivity. When welding magnesium alloys with high-power heat sources and high welding speeds, it is easy to cause overheating of the weld seam and the metal near the seam area, and the grain growth leads to grain coarsening;
[0010] (5) The surface tension of magnesium alloy is small, and the weld metal is prone to collapse during welding
Patent 200710144908 discloses a method of ultrasonic-assisted laser brazing (melting) welding. The wettability of weld metal has been greatly improved by ultrasonic-assisted welding, but the control of pores and cracks in the weld still needs to be improved in this method
Patent 201310061962 discloses a method of ultrasonic-assisted laser repair, which solves the problem of coarse crystal grains, but this method uses an ultrasonic introduction device to directly introduce ultrasonic waves from the bottom of the workpiece, which reduces the energy utilization rate of ultrasonic waves
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specific Embodiment approach 1
[0030] Specific embodiment one: a kind of magnesium alloy laser-ultrasonic double-sided welding method of the present embodiment, it is carried out according to the following steps:
[0031] Step 1: Before welding, sand the workpiece to be welded to remove the surface oxide film, and clean it with ultrasonic waves in acetone;
[0032] Step 2: Fix the polished or cleaned workpiece to be welded on the welding fixture and place it on the workbench;
[0033] Step 3: Fix the ultrasonic generating device on the laser head, keep the laser beam incident vertically, and make the focus be at the position to be welded; The included angle α with the laser beam axis is 30°~60°, and the laser beam, ultrasonic horn and welding seam are located in the same vertical plane;
[0034] Step 4: Set welding process parameters:
[0035] 1) Laser welding: the laser power is 1kW~5kW, the defocus is -3~+3mm, the welding speed is 0.5~3m / min, Ar gas is used for protection, and the Ar gas flow is 5L / min~35...
specific Embodiment approach 2
[0039] Embodiment 2: This embodiment differs from Embodiment 1 in that in step 4, the ultrasonic welding adjusts the vibration frequency during the welding process so as to avoid the resonant frequency range of the magnesium alloy liquid molten pool. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0040] Specific embodiment three: the difference between this embodiment and specific embodiment one is that the laser of the laser welding machine is CO 2 Gas laser, YAG solid-state laser, semiconductor laser or fiber laser. Others are the same as in the first embodiment.
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Abstract
The invention discloses a magnesium alloy laser-ultrasonic double-side welding method and relates to a double-side welding method. The laser-ultrasonic double-side welding method comprises the following steps: firstly, cleaning and clamping a to-be-welded workpiece, setting the ultrasonic and laser position, further setting related processing parameters to carry out welding; compared with a conventional argon tungsten-arc welding (TIG welding) method, the laser-ultrasonic double-side welding method disclosed by the invention has the advantages that the welding speed is higher, the magnesium alloy welding efficiency is improved, deficiencies like pores, slag inclusion and hot cracks which are easily produced in welding joints, as well as incomplete penetration are reduced, so that the welding joint can meet the using requirements; compared with the one side ultrasonic assisted laser welding method, the laser-ultrasonic double-side welding method disclosed by the invention further has the advantages that the temperature gradient in the molten pool is smaller under the actions of the heat sources, namely laser and ultrasonic, due to the fact that the ultrasonic wave is applied onto the back surface of a welding seam, the welding deformation and the thermal stress produced during the welding process are smaller, the tendency that the welding joint produces hot cracks within a brittle temperature range is effectively reduced, and the mechanical property of the welding seam is further improved.
Description
technical field [0001] The invention relates to a laser-ultrasonic double-sided welding method for a magnesium alloy thin plate, which belongs to the field of material processing engineering. Background technique [0002] As the lightest metal structural material, magnesium alloy is widely used in aerospace, automobile manufacturing, electronic communication, national defense and military fields. With the development of science and technology, magnesium alloys will be more and more widely used in various fields. Therefore, the development of high-efficiency and high-quality connection technology has become one of the key issues that need to be solved urgently. At present, the welding methods of magnesium alloy mainly include: tungsten inert gas shielded welding, melting pole inert gas shielded welding, friction stir welding, laser welding, electron beam welding and so on. [0003] When using traditional arc welding methods (TIG, MIG welding, etc.) to weld magnesium alloys, ...
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