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A hybrid welding and laser technology, used in laser welding equipment, welding equipment, metal processing equipment, etc., can solve problems such as forming defects, and achieve the effects of inhibiting pores, inhibiting eruptions, and promoting internal convection
Active Publication Date: 2022-03-01
HARBIN INST OF TECH
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[0005] The invention aims to solve the problems of forming defects and air holes in the welded parts after oscillating laser welding, proposes a oscillating laser-ultrasonic composite welding method, and designs the laser-ultrasonic composite welding joint structure
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[0042] Step 1: process the parts to be welded of the workpiece to the required accuracy as required, and grind or clean the surfaces on both sides of the workpiece after processing;
[0043] Step 2: fixing the workpiece to be welded after grinding or cleaning on the welding fixture;
[0044] Step 3: The laser defocus is 0mm, the laser power is 1800W, the welding speed is 1.0m / min, the laser swing frequency is 200Hz, the swing amplitude is 2mm, the shielding gas is Ar gas, and the flow rate is 20L / min;
[0045] Step 4: In the actual welding process, the robot integrated system is used to control the welding process parameters. First, the laser is controlled to emit laser light and swing, and then the robot is controlled to make the composite welding head move to complete the welding process.
Embodiment 2
[0047] The method of the present invention welds a 2mm thick titanium alloy butt joint:
[0048] Step 1: process the parts to be welded of the workpiece to the required accuracy as required, and grind or clean the surfaces on both sides of the workpiece after processing;
[0049] Step 2: Fix the workpiece to be welded after grinding or cleaning on the welding fixture, the ultrasonic horn is perpendicular to the surface of the workpiece to be welded, and the distance below the end is 8cm from the surface of the workpiece to be welded;
[0050] Step 3: The laser defocus is 0mm, the laser power is 1800W, the welding speed is 1.0m / min, the laser swing frequency is 200Hz, the swing amplitude is 2mm, the ultrasonic vibration frequency is 30kHz, the vibration amplitude is 10μm, and the shielding gas is Ar gas , the flow rate is 40L / min;
[0051] Step 4: In the actual welding process, the robot integrated system is used to control the welding process parameters. First, ultrasonic vib...
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Abstract
An oscillating laser-ultrasonic composite welding method relates to the field of material processing engineering. The invention aims to solve the problems of forming defects and air holes in welded parts after oscillating laser welding. The present invention adopts ultrasound to assist in changing the flow of the melt to avoid undercut defects on both sides. After the use of ultrasonic assistance, the crystal grains are further refined, the pores are suppressed, the shape of the keyhole is improved by using ultrasound, the plasma and splash eruption are suppressed, and the effective utilization rate of energy is increased. Using coaxial shielding gas for welding protection has a better protection effect on the molten pool, and is more suitable for welding of easily oxidized materials such as titanium alloys and aluminum alloys. Compared with contact ultrasonic assistance, non-contact ultrasonic vibration can be applied to the welding of various complex structures and trajectories, avoiding application obstacles caused by poor contact and space restrictions. The invention is applied in the field of material processing.
Description
technical field [0001] The invention belongs to the field of material processing engineering, and in particular relates to an oscillating laser-ultrasonic composite welding method and device design. Background technique [0002] As one of the "welding technologies with the most development potential in the 21st century", laser has high energy density, good weld quality, large aspect ratio, small heat-affected zone, small welding deformation, fast welding speed and easy The advantages of automation have been widely used in industrial production. However, laser welding requires high assembly precision of structural parts. It is usually necessary to ensure the tight fit of the plates during laser welding and the stability of the welding process. In the process of production and application, due to errors caused by various production links such as design, processing, and assembly, the workpieces that actually need to be welded often have large gaps and misalignment, which puts f...
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