Laser welding machines is an efficient and precise welding method that uses a high-energy-density laser beam as a heat source. Laser welding is one of the important aspects of the application of laser material processing technology. In the 1970s, it was mainly used for welding thin-walled materials and low-speed welding. The welding process is of thermal conduction type, that is, the surface of the workpiece is heated by laser radiation, and the surface heat diffuses to the interior through thermal conduction. By controlling the width, energy, peak power and repetition frequency of the laser pulse and other parameters to melt the workpiece and form a specific molten pool. Due to its unique advantages, it has been successfully used in the precision welding of micro and small parts.
一、Welding characteristics
It belongs to fusion welding, which uses the laser beam as the energy source to impact on the joint of the weldment.
The laser beam can be guided by a flat optical element, such as a mirror, and then projected onto the weld seam by a reflective focusing element or mirror.
Laser welding is non-contact welding, no pressure is required during the operation, but inert gas is required to prevent oxidation of the molten pool, and filler metal is occasionally used.
Laser welding can be combined with MIG welding to form laser MIG composite welding to achieve large penetration welding, and the heat input is greatly reduced compared to MIG welding.
二、Working principle of mold welding machine
The mold laser welding machine is also a branch of the laser welding machine, so the working principle is to use high-energy laser pulses to locally heat the material in a small area. The energy of the laser radiation diffuses into the material through heat conduction, and the material is melted and formed. specific melt pool. It is a new type of welding method, mainly for the welding of thin-walled materials and precision parts, and can realize spot welding, butt welding, stitch welding, sealing welding, etc. Small deformation, fast welding speed, smooth and beautiful welding seam, no need or simple treatment after welding, high welding seam quality, no pores, precise control, small focusing spot, high positioning accuracy, and easy automation. High-power laser welding machines have been launched, and various styles of laser welding machines and repairs can be realized for thicker materials.
Sample：
三、The characteristics of mold laser welding
The mold laser welding machine adopts a large-screen LCD Chinese interface display, which makes it easier for the operator to learn and operate. The equipment also adopts the font programming function to realize multi-mode work, which is suitable for mold repair of most materials. Not only the heat-affected area is small, the oxidation rate is low, but also there will be no blisters, pores and other phenomena. After the mold is repaired, the effect of the repair is to achieve no unevenness at the joint, and it will not cause mold deformation.
四、Configuration and processing technology
1.The mold laser welding machine should use a 10X or 15X microscope to monitor the operation.
2. The power supply of the mold laser welding machine can adopt the waveform adjustable function, which is suitable for welding of different materials. Such as: die steel, stainless steel, beryllium copper, aluminum, etc.
3. The CCD system (camera system) can be used for monitoring, the function is: in addition to the operator observing from the microscope, non-operators can watch the entire welding process through the display screen of the camera system, this device is beneficial to non-operating The technical training of personnel and exhibition demonstrations have played a good role in promoting the laser welding technology.
4. It can melt welding wires of different diameters, from 0.2 to 0.8 in diameter.
5. The mold laser welding machine must be protected by argon gas, and the program should be set to emit argon gas first and then the laser to prevent the oxidation of the first pulsed laser during continuous processing.
6. When the mold is laser welded, the most common occurrence is that there are bite marks around the welding part. It is necessary to use the method of laser air punching to cover the changes that may cause bite marks to prevent the occurrence of bite marks. It is sufficient that the light spot exceeds the edge of the welding position by 0.1mm.
Post time: Jun-12-2023
