With the development of production, welding is widely used in the nuclear industry, aerospace, aviation, construction, shipbuilding, machinery manufacturing, and other fields. Welding technology is indispensable processing means in economic development. After entering the 21st century, welding is an important part of the manufacturing industry and is developing rapidly.
China's laser welding is at the world's advanced level, has the technology and ability to use a laser to form complex titanium alloy components with an area of more than 12 square meters, and has been invested in the prototype and product manufacturing of many domestic aviation scientific research projects. In October 2013, China's welding experts won the highest academic award in the welding field - the Bruker Award, and China's laser welding level has been recognized by the world.
The British Welding Institute (TWI) recommends nominations from more than 4000 member units from more than 120 countries every year and finally awards the award to an expert in recognition of his outstanding contributions in the field of welding or connection science, technology, and industrial applications.
Argon arc welding is convenient and cheap, but the welding spot is large, it is easy to splash welding slag, and the heat input is much larger than laser welding, there will be incomplete penetration or burn through, it is easy to produce deformation, it has certain technical requirements for welding masters, and the salary is high.
Laser welding, as long as the hardware is completed by laser welding, the welding spot of laser welding can be adjusted, and the minimum welding spot can reach 0.1mm. Whatever effect needs to be achieved, whether it is spot welding or continuous welding, laser welding can be completed. Moreover, the range of the heat-affected zone is small, the weld is narrow, the weld cooling speed is fast, the change of weld metal properties is small, and the weld is hard. The workpiece with a small weld does not need to use a welding wire, which is very convenient, and argon protection can be selected according to the process requirements; The size of the weld spot produced by laser welding is uniform and the weld is beautiful. Even the parts that are difficult to operate can be welded, and the technology is relatively not too difficult to reduce the labor cost. Laser welding has been gradually replacing argon arc welding, and the technology and technology are also making more and more progress with the development of the times.
Cold welding, in fact, is electric welding, which needs welding wire to cooperate.
Reflow soldering is mainly used for the welding of circuit boards. The machine is slightly larger, and there are many kinds of reflow soldering. Generally speaking, it has great limitations.
Working principle of laser welding: Laser produces high temperatures that fuse materials together.
Workpieces can be placed in a vacuumed or controlled space under an internal gas environment.
The laser beam can be concentrated in a very small area and can weld small and closely spaced parts.
There is a wide range of materials that can be welded, and various dissimilar materials can also be interconnected.
When welding thin materials or thin diameter wires, it will be less prone to remelting troubles like arc welding.
It is immune to magnetic fields (both arc and electron beam welding are easy) and aligns weldments accurately.
It can weld metals with different physical properties, such as different resistances.
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