Today the most advanced welding technology in the world is laser welding. The laser welding machine uses high-energy laser pulses to locally heat the material in a small area. It is a new type of welding method, mainly for the welding of thin-walled materials and precision parts. It can realize spot welding, stitch welding, sealed welding, etc.With high aspect ratio, small weld width, small heat affected zone.And fast welding speed , beautiful, no need to deal with or simple processing after welding, small focus spot, high positioning accuracy, easy to realize automation. What materials can the laser welding machine weld?
The laser welding machine can be used to weld S136, SKD-11, NAK80, 8407, 718, 738, H13, P20, W302, 2344 and other types of die steel, and the welding effect is better.
The laser welding machine welds carbon steel with good results. The welding quality depends on the content of impurities. In order to obtain good welding quality, the carbon content exceeds 0.25% requires to preheat. As the carbon content increases, the sensitivity of weld cracks and notches will increase.
3. Alloy steel
For laser welding of low-alloy high-strength steel, as long as the selected welding parameters are appropriate, a joint with mechanical properties equivalent to the base metal can be obtained.
4. Stainless steel
Because the welding speed and heat-affected zone of the laser welding machine are small, the overheating phenomenon and the large linear expansion coefficient of the stainless steel welding are alleviated, and the welding seam has 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. Welding thin plates with a low-power laser welding machine can obtain a well-formed joint with a smooth and beautiful weld seam.
5. Copper and copper alloy
Welding copper and copper alloys is prone to problems of infusion and incomplete penetration. Therefore, For preheating measuresa we should use heat source with concentrated energy and high power; When the thickness of the workpiece is thin or the structural rigidity is small, and there are no measures to prevent deformation, it is easy to produce large deformation after welding, and when the welding joint is subject to large rigid constraints, welding stress is likely to occur; It is also prone to thermal cracks when welding copper and copper alloys; Porosity is a common defect in copper and copper alloy welding.
6. Aluminum and aluminum alloy
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, and the dissolved hydrogen becomes a source of defects in the weld, and there are many pores in the weld. , And there may be a cavity in the root during deep penetration welding, and the weld bead formation is poor.