Laser welding machine is a very common welding equipment. It mainly uses high-energy laser pulse to heat the material locally. The energy of laser radiation is guided to the internal diffusion of the material through heat transfer, and the material is melted to form a characteristic molten pool to achieve the purpose of welding.
Laser welding machine become a new industrial technology in industrial welding processing with its advantages of fast welding speed, high precision, high efficiency, flat and beautiful weld. Laser welding machines are widely used, but many people do not know what materials can be welded by laser welding machines?
Materials that laser welding machine can welded
1. Die steel
The laser welding machine can be applied to S136,SKD-11,NAK80,8407,718,738,H13,P20,W302 and 2344 and other models of die steel welding, and the welding effect is good.
2. Carbon steel
Carbon steel is welded by laser welding machine with good effect, and its welding quality 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 to the side of low-carbon materials to ensure the quality of the joint. Because the heating speed and cooling speed of laser welding are very fast, when welding carbon steel. With the increase of carbon content, welding crack and notch sensitivity will also increase. Medium and high carbon steels and ordinary alloy steels can be well laser welded, but preheating and post welding treatment are required to eliminate stress and avoid cracks.
3. Alloy steel
Laser welding of low-alloy high-strength steel, as long as the selected welding parameters are appropriate, the joints with the mechanical properties equivalent to 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 coefficient during stainless steel welding are reduced, and the weld joint is free of defects such as pores and inclusions.
Compared with carbon steel, stainless steel is easier to obtain deep penetration narrow welds because of its low thermal conductivity, high energy absorption and melting efficiency. Using low-power laser welding to weld thin plates, joints with good appearance and smooth and beautiful welds can be obtained.
5. Copper and copper alloys
Welding copper and copper alloys is easy to cause problems of incomplete fusion and incomplete penetration, so energy concentrated, high-power heat source and preheating measures should be adopted.
When the workpiece is thin or the structural stiffness is small, and there is no deformation prevention measures is easy to produce large deformation after welding;
When the welded joint is subject to large rigid constraints, it is easy to produce welding stress;
It is also easy to produce hot cracks when welding copper and copper alloys;
Porosity is a common defect in the welding of copper and copper alloys.
6. Aluminum and aluminum alloy
Aluminum and aluminum alloys are highly reflective materials. When welding aluminum and its alloys, 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 during deep penetration welding, holes may appear at the root and the weld bead formation is poor.
7. Plastic
Almost all thermoplastics and thermoplastic elastomers can use laser welding technology. Commonly used welding materials include PP, PS, PC, ABS, Polyamide, PMMA, POM, PET, PBT, etc. Other engineering plastics, such as polyphenylene sulfide PPS and liquid crystal polymers, cannot directly use laser welding technology because of their low laser transmittance. Generally, carbon black is added to the underlying material so that the material can absorb enough energy to meet the requirements of laser transmission welding.
Laser welding machine can weld more than these materials. Laser welding can be carried out between a variety of dissimilar metals. Research shows that laser welding can be carried out between a variety of dissimilar metals such as copper nickel, nickel titanium, copper titanium, titanium molybdenum, brass copper, low carbon steel copper under certain conditions.
