Laser welding machine is a very common welding equipment. It mainly uses high-energy laser pulses to locally heat the material. The energy of the laser radiation diffuses into the material through heat conduction, and melts the material to form a characteristic molten pool to achieve the purpose of welding. .
Laser welding machines have become an emerging industrial technology in industrial welding processing due to their advantages such as fast welding speed, high precision, high efficiency, and smooth and beautiful welds. Laser welding machines are now widely used, but many people don’t know what materials can be welded by laser welding machines.
1、mold steel
The laser welding machine can be used for welding mold steel of S136, SKD-11, NAK80, 8407, 718, 738, H13, P20, W302, 2344 and other models, and the welding effect is good.
2、carbon steel
Carbon steel is welded with a laser welding machine, and the effect is good. The quality of the welding depends on the impurity content. In order to obtain good welding quality, preheating is required when the carbon content exceeds 0.25%. When steels with different carbon contents are welded to each other, the welding torch can be slightly biased toward the low-carbon material to ensure joint quality. Since the heating and cooling rates during laser welding are very fast, when welding carbon steel. As the carbon content increases, so does the susceptibility to weld cracking and notching. Both medium and high carbon steel and ordinary alloy steel can be successfully laser welded, but preheating and post-welding treatment are required 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, joints with mechanical properties comparable to those of the base metal can be obtained.
4、Stainless steel
In general, stainless steel welding is easier to obtain high-quality joints than conventional welding. Due to the high welding speed and small heat-affected zone of laser welding, the overheating phenomenon and the adverse effects of large linear expansion coefficients during stainless steel welding are reduced, and the welds have no defects such as pores and inclusions. Compared with carbon steel, stainless steel is easier to obtain deep penetration narrow welds due to its low thermal conductivity, high energy absorption rate and melting efficiency. Using low-power laser welding to weld thin plates can obtain joints with good appearance and smooth and beautiful welds.
5、Copper and copper alloys
Welding copper and copper alloys is prone to problems of incomplete fusion and incomplete penetration. Therefore, a heat source with concentrated energy and high power should be used together with preheating measures. When the thickness of the workpiece is thin or the structural stiffness is small, and there are no measures to prevent deformation, welding It is easy to produce large deformation in the end, and when the welded joint is subject to greater rigidity constraints, welding stress is easy to occur; hot cracks are also prone to occur when welding copper and copper alloys; pores are a common defect when welding copper and copper alloys.
6、Aluminum and aluminum alloys
Aluminum and aluminum alloys are highly reflective materials. When welding aluminum and its alloys, as the temperature increases, the solubility of hydrogen in aluminum increases sharply. The dissolved hydrogen becomes a source of defects in the weld, and there are many pores in the weld. , and during deep penetration welding, holes may appear at the root, and the weld bead formation is poor.
7、plastic
Laser welding technology can be used for almost all thermoplastics and thermoplastic elastomers. Commonly used welding materials include PP, PS, PC, ABS, polyamide, PMMA, polyformaldehyde, PET and PBT, etc. Some other engineering plastics, such as polyphenylene sulfide (PPS) and liquid crystal polymers, cannot directly use laser welding technology due to their low laser transmittance. Carbon black is generally added to the underlying material so that the material can absorb sufficient energy. , thereby meeting the requirements of laser transmission welding for welding.
Laser welding can weld far more materials than these. Laser welding can be performed between a variety of dissimilar metals. Research shows that it can be used in copper-nickel, nickel-titanium, copper-titanium, titanium-molybdenum, brass-copper, low Laser welding can be carried out under certain conditions between carbon steel and copper and other dissimilar metals.
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