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However, because the machine is relatively TIG flexibility, some large-scale mold is not suitable for laser welding, laser used in the repair of large mold parts and some mobile phones, plastic molds and similar to its size and precision mold. Often a small corner defect to be scrapped before the laser repair after normal use, and a few solder joints concerned to restore the loss of tens of thousands or even hundreds of thousands of It also determines the mold repair industry, low-input high-return characteristics. Mold welding program-making process learned that mold welding industry prospects through market research, we have proposed the manufacture of mold welder program, the basic idea is modified on the basis of the origin welder. Several of which focus in part. Normally, three to five pieces of presenter laser pointer should be inspected at the same time.
To be able to adapt to the welding of high strength, high hardness materials, to a substantial increase of laser energy; to increase in order to ensure continuity and uniformity of the solder joint due to some larger molds, laser cavity made of the cantilever; two-dimensional table, place the mold instead of the previous spot welder, basic hand positioning, laser welding, classification and principle based on the mode of action of laser on the workpiece or the laser beam output to the different ways can the laser welding pulsed laser welding and continuous laser welding, the former forming a circular solder joints, which form a continuous weld pulse welding energy input to the workpiece is intermittent pulse. The extensive use of pulsed lasers in pulsed laser welding is a YAG laser. The log of Laser Pointers has contained a lot of information.
The repetition rate of YAG laser used is wide. Can also be continuous output YAG lasers and CO2 lasers through the gate to open or close above the laser light to be used for pulse welding. According to laser welding, the weld formation characteristics can be laser welded into the heat conduction welding and deep penetration (holes laser welding). Depth is limited to mold welding is thermal conduction welding in the pulsed laser welding, the principle is when the laser power density of 10 W/cm2, the laser will be elevated metal surface temperature of the melt, from the micro, laser inhalation of metallic materials under the surface of 10-5cm. Photon energy absorbed by the conduction electrons, the electrons in the energy passed to the lattice within 10-11 ~ 10-10S. And normally the real power of presenter laser pointer will be a little bit lower than the nominal power.
That the electronic temperature is equal, in order to establish the concept of the metal surface temperature T after time greater than 10-9S. Laser heating of metal can be seen as a surface heat source in the surface layer of light energy into heat, to the spread of metal depths follow the general heat conduction law, and then through the thermal conduction the internal heat transfer to the metal, the molten region expand gradually solidified after the formation of solder joints, the penetration depth contour approximately hemispherical, which is characterized by the use of the laser spot power density, a large part of the light reflected by the metal surface, the light absorption rate lower melting pool to form a long time. and the melt depth, used for the welding of small parts. For the laser torch, different kinds of presenter laser pointer will own different level of the highest power.
When the energy of the laser irradiation to the surface, some energy is reflected, part of the energy is absorbed, the transparent material on the part of the energy transmission. Transmission rate is zero for the metallic materials, plus the total energy of irradiation 1 unchanged, so if the increase in the reflectivity of the material will reduce the absorption rate, and vice versa was established. Laser marking or welded samples, we often encounter the Au, Cu, or brightness high stainless steel and other materials, such materials is their own reflection is higher than other materials or surface roughness is very small resulting in high reflectivity. The high reflectivity determines the relatively low absorption rate, so often we increase the laser energy to achieve the required effect. It is done by the specific personnel who specialize in the test and commission of the power of presenter laser pointer.