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Time:2018-09-27 09:34:48
  Laser welding is to radiate a laser beam with excellent directionality, high brightness, high intensity, high monochromaticity, high coherence, etc. into the surface area of the workpiece. After the laser beam is focused by the optical system, the power of the laser focus is The density of 104-107W/cm2, through the interaction of the laser and the object to be welded, in a very short time, the welded portion forms a highly concentrated heat source region, and the heat can be melted by the soldered region to form a firm solder. Dots and welds. Depending on the laser used and the way it works, there are two common types of laser welding, one is pulsed laser welding, which is mainly used for the welding of single-point fixed continuous and book materials, and forms a circular solder joint during welding; The other is continuous laser welding, which is mainly used for welding and cutting of thick and thick parts, and forms a continuous weld during the welding process. In general, the choice of welding materials, the choice of laser welding machine, and the choice of processing table are the main factors affecting the laser welding effect. The degree of strength and weakness of the melting phenomenon during the welding process depends mainly on the time, power density and peak power of the surface of the laser action material. By controlling the above parameters, lasers can be used for various welding processes. In laser welding, the beam focus position is one of the most critical control process parameters. Under certain laser power and welding speed, the maximum penetration depth and good weld shape can be obtained only when the focus is in the optimal position range.

First, the main characteristics of laser welding

Compared to other conventional welding techniques, laser welding has the following advantages:

1. Laser welding is non-contact welding. It does not need to be pressurized during the operation. It has fast welding speed, high efficiency, large depth, small residual stress and deformation. It can be welded and welded at room temperature or under special conditions (such as closed space). The device is simple and does not generate X-rays.

2. It can weld refractory materials such as high melting point metals, and even can be used for welding non-metallic materials such as ceramics and plexiglass. It has good effect on welding of shaped materials and has great flexibility, which is difficult for welding. Non-contact long-distance welding is performed on the parts.

3. The laser beam can be focused to obtain a small spot. Because it is not affected by the magnetic field and can be accurately positioned, micro-welding can be performed, which is suitable for group welding of micro- and small-sized workpieces produced in large quantities.

4. The laser beam can easily realize the beam splitting according to time and space. The switching device can transfer the laser beam to multiple workstations. Therefore, multi-beam simultaneous processing and multi-station processing can provide conditions for more precise welding.

5. Laser welding is non-contact processing, there is no problem of tool loss and tool exchange. At the same time, it does not need to use electrodes, so there is no concern of electrode contamination or damage, and it is easy to automate high-speed welding. It can also be digitally or computer controlled. However, laser welding also has certain limitations:

First, the cost of lasers and related systems is high, and the investment in disposable equipment is large.

Secondly, during the welding process, the welding assembly accuracy is required to be high, and the position of the beam on the workpiece is not required to be significantly offset。

In addition, the thickness of the weld is smaller than that of electron beam welding, and it is more difficult to weld some metals with high reflectivity.

Second, the laser welding process

1. Welding between sheets and sheets. Manual welding and automatic welding are generally used, which include four methods of butt welding, end welding, center penetration melting welding, and center piercing fusion welding.

2。 Welding of wire and wire。 Manual welding and semi-automatic welding are generally used, including wire and wire butt welding, cross welding, parallel lap welding, and T-welding。

3. Welding of wire and block components. The connection between the wire and the block element can be successfully achieved by laser welding, and the size of the block element can be arbitrary. The geometry of the filamentary elements should be noted in the welding.
(This article was originally written by Chenxi Laser. Reprinted must indicate the source: www.levihersh.com, cherish the labor results of others, is to respect yourself)

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