Magnetic material laser welding method
A magnetic material, laser welding technology, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of reducing product consistency and yield, too short welding time, increasing test difficulty, etc., to reduce residual magnetism The effect of greatly reducing or even disappearing, reducing the degree of irregular arrangement, and avoiding the fragmentation of magnetic materials
Active Publication Date: 2018-05-15
WUHAN LINGYUN PHOTOELECTRONICS SYST
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Problems solved by technology
But this method also has serious deficiencies, the brazing filler metal will burst and splash and tin beads will occur when the temperature rises rapidly in a short period of time; if the welding time is too short, the infiltration effect between the brazing filler metal and stainless steel is not good, and voids often appear in the joint surface of the two. Question attached Figure 4 shown
The problem of welding spatter needs to increase the cleaning process in the later stage. In the face of increasingly stringent environmental protection policies, almost no manufacturers will choose this solution; in addition, the voids formed on the welding surface will reduce the consistency of the product and increase the yield. It can only be detected by X-ray, which greatly increases the difficulty of testing
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[0041] Below by specific embodiment the present invention is described in further detail:
[0042] The welding process of a method for laser welding magnetic materials of the present invention is as follows:
[0043] Step 1: Perform laser surface treatment on the area to be welded of the basin frame 3 to reduce surface roughness and remove surface stains. Pulsed lasers are based on photophysical reactions caused by the interaction of high-intensity beams, short pulses of laser light, and contamination layers. The absorption of large energy forms a rapidly expanding plasma to generate shock waves; the shock waves break the pollutants into fragments and are removed. as attached Image 6 As shown, the laser beam 12 is focused on the surface of the basin frame 3 to change the originally rough and polluted stainless steel surface 11 into a flat, clean and smooth surface 10 . In this process, the laser beam 12 scans back and forth on the surface of the basin frame 3 according to ...
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The invention relates to the technical field of laser welding and particularly relates to a magnetic material laser welding method. The magnetic material laser welding method comprises the steps thata to-be-welded part of a basin frame is coated with a layer of soft solder, and the soft solder is melted by laser irradiation, so that a to-be-applied soft solder layer is formed; solder sheets are placed at the tops of a side magnet and a center magnet; the basin frame is reversely arranged on the solder sheets in the manner of allowing the to-be-applied soft solder layer to face downwards, andpressure is applied to the top of the basin frame to allow the to-be-applied soft solder layer to be in close contact with the solder sheets; the top of the basin frame is subjected to the laser irradiation till the solder sheets are completely melted; and after a welding position is cooled, the pressure applied to the top of the basin frame is withdrawn, and thus the welding is completed. The welding strength is higher; after the welding is completed, no destruction is caused to the surface of a material and the surface of the material does not have marks; and the situation that high laser peak energy causes fragmentation of the magnetic material is avoided.
Description
technical field [0001] The invention relates to the technical field of laser welding, in particular to a method for laser welding magnetic materials. Background technique [0002] Microspeaker devices capable of producing sound are usually installed in modern consumer electronics products such as mobile phones, PDAs, portable computers, and earphones. attached figure 1 And attached figure 2 It is the internal schematic diagram of a conventional micro-speaker (without the diaphragm), which generally consists of a side magnet 1, a center magnet 2, and a frame 3. The position of the frame 3 near the side magnet 1 is usually processed with a glue overflow groove 4. The side magnet 1 and the center magnet 2 are usually made of neodymium iron boron (NdFeB) magnetic material in the field of micro-speakers, and the surface is galvanized for protection against oxidation. NdFeB magnetic material is actually a ceramic-like material formed by pressing and sintering alloy powder and ...
Claims
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Login to View More IPC IPC(8): B23K1/005B23K1/19B23K1/20
CPCB23K1/0008B23K1/0056B23K1/19B23K1/20
Inventor 林卿
Owner WUHAN LINGYUN PHOTOELECTRONICS SYST