威廉希尔官方下载Mar 17, 2020
The laser welding machine is a piece of common welding equipment. It mainly uses a high-energy laser pulse to heat the local part of the material. The energy radiated by laser diffuses through the heat transfer to guide the internal diffusion of the material and forms a characteristic melting pool after melting the material to achieve the purpose of welding. Laser welding machine with the advantages of fast welding speed, high precision, high efficiency, the smooth and beautiful weld has become a new industrial technology in industrial welding processing. The laser welding machine is widely used now, but many people do not know what materials can be welded by a laser welding machine.
The materials that can be welded by a laser welding machine are:
1. Die steel
Laser welding machine can be applied to S136, SKD-11, NAK80, 8407, 718, 738, H13, P20, W30, 2344, and other mold steel welding, and the welding effect are good.
2. Carbon steel
Carbon steel is welded by a laser welding machine with a good effect. The quality of welding depends on the content of impurities. In order to obtain good welding quality, preheating is needed when the carbon content is more than 0.25%. When the steels with different carbon content are welded with each other, the welding torch can be slightly inclined to the side of the low carbon material to ensure the joint quality. Because the heating speed and cooling speed of laser welding are very fast, so when welding carbon steel. With the increase of carbon content, the weld crack and notch sensitivity will also increase. Medium, high carbon steel, and common alloy steel can be laser welded well, but preheating and post welding treatment are needed to eliminate stress and avoid cracks.
3. Alloy steel
For laser welding of low alloy high strength steel, as long as the selected welding parameters are appropriate, the joints with the same mechanical properties as the base metal can be obtained.
4. Stainless steel
In general, stainless steel welding is easier to obtain high-quality joints than conventional welding. Because of the high welding speed and the small heat-affected zone in laser welding, the overheating phenomenon and the bad effect of large linear expansion coefficient in stainless steel welding are reduced, and the weld has no defects such as porosity and inclusion. Compared with carbon steel, stainless steel has lower thermal conductivity, higher energy absorption rate, and melting efficiency, which makes it easier to obtain deep penetration narrow weld. By using low power laser to weld thin plates, the joints with good appearance and smooth and beautiful welds can be obtained.
5. Copper and copper alloy
Welding copper and copper alloy are easy to produce problems of incomplete fusion and incomplete penetration, so energy concentration, high-power heat source and preheating measures shall be adopted; when the thickness of the workpiece is thin or the structural rigidity is small, and there are no deformation prevention measures, it is easy to produce large deformation after welding, and when the welding joint is subject to large rigid constraints, it is easy to generate welding stress; when welding copper and copper alloy, it is also easy to generate welding stress It is easy to produce hot cracks and pores are common defects in welding of copper and copper alloy.
6. Aluminum and aluminum alloy
Aluminum and aluminum alloy are highly reflective materials. With the increase of temperature, the solubility of hydrogen in aluminum increases sharply, and the dissolved hydrogen becomes the defect source of the weld. There are many pores in the weld, while there may be cavities at the root and poor weld bead formation in deep fusion welding.
Laser welding technology can be used in almost all thermoplastic and thermoplastic elastomers. Commonly used welding materials are PP, PS, PC, ABS, polyamide, PMMA, POM, pet, and PBT. Other engineering plastics, such as PPS and liquid crystal polymer, can not directly use laser welding technology because of their low laser transmittance. Generally, carbon black is added to the bottom material so that the material can absorb enough energy to meet the requirements of laser transmission welding.
Laser welding can be used in many kinds of dissimilar metals, such as copper-nickel, nickel-titanium, copper titanium, titanium molybdenum, brass copper, low carbon steel copper, and so on.