With the continuous improvement of laser power, more and more high-end manufacturing is applied to high-power laser welding automation solutions, which is gradually becoming a new application growth point of laser welding.
In particular, the manufacturing industry is in the stage of transformation and upgrading.
The processing advantages of high-power laser welding equipment are obvious, and the application penetration rate is rising, especially in the field of processing and manufacturing of metal materials and parts.
Application of laser welding in automobile
At present, the main application processes of laser welding in the automotive industry mainly include laser welding of unequal thickness plates, laser assembly welding of body assembly and subassembly, and laser welding of automotive parts.
Due to the very large output of automobiles, it matches the characteristics of laser welding suitable for mass production.
At the same time, the degree of automotive manufacturing automation is very high, which also matches the characteristics of laser welding automation.
Automobile laser welding has many advantages:
(1) It can reduce body weight.
If other welding methods are adopted, the weight of the whole vehicle will increase by 50-100kg after the welding rod is melted.
(2) It is firm and reliable, and the strength of the laser welding part is higher.
Through the tensile test, it can be found that the force required to crack a welding spot is about 3500N. The weld strength of the same length formed by laser welding is 1.5 times that of spot welding.
(3) More efficient.
The welding speed of laser welding is 5 ~ 6m/min, and the average speed of spot welding is 1/3S. Take the top cover of the car as an example. If spot welding is used, it will take 5 minutes. Changing to laser welding takes only 0.8 minutes.
(4) Beautiful after welding.
Laser welding is adopted, with short weld and smooth and bright after welding.
Application of laser welding in power battery
There are many manufacturing processes for ion batteries or battery packs, among which there are many processes, such as explosion-proof valve sealing welding, pole lug welding, soft connection welding, safety helmet spot welding, battery shell sealing welding, module and pack welding, etc. laser welding is the best process.
Battery laser technology
Welding of battery explosion-proof valve
The explosion-proof valve of the battery is a thin-walled valve body on the battery sealing plate. When the internal pressure of the battery exceeds the specified value, the explosion-proof valve body will rupture to avoid the battery burst.
Battery lug welding
In the manufacturing process of power battery, one of the links is to weld the battery lug and pole to the starting point.
In the production of the secondary battery, it needs to be welded with another aluminum safety valve.
The welding shall not only ensure the reliable connection between the pole lug and the pole column, but also require the weld to be smooth and beautiful.
Battery electrode strip spot welding
Pulse welding machine is generally used for the welding of battery pole band. Due to its good beam quality and small welding spot, it has unique advantages in the welding of high reflectivity aluminum band, copper band and narrow-band battery pole band (pole band width less than 15mm)
Sealing welding of power battery shell and cover plate
The shell materials of the power battery include aluminum alloy and stainless steel, of which the most aluminum alloy is 3003 aluminum alloy, and a few use pure aluminum.
Stainless steel is the material with the best laser weldability, especially 304 stainless steel, which can obtain welds with good appearance and performance whether pulsed or continuous laser.
Power battery module and pack welding
The series and parallel connection between power batteries is generally completed by welding the connecting piece and the single battery.
The materials of the positive and negative electrodes are different.
Generally, there are two kinds of materials: copper and aluminum.
Because the brittle compound is formed after laser welding between copper and aluminum, it can not meet the use requirements.
Ultrasonic wave welding is usually used.
In addition, laser welding is generally used for copper, copper, aluminum and aluminum.
Application of laser welding technology in aerospace
In the field of aerospace, common welding technologies include laser welding, electron beam welding, friction stir welding, diffusion welding, linear friction welding, etc. among them, laser welding technology is the most widely used and occupies an important position in this field.
Laser welding technology is widely used in aerospace equipment manufacturing, especially in the manufacturing of weapons and aircraft, aircraft skin splicing, skin and long derivative welding, thin-wall parts manufacturing, fuselage accessories assembly, etc.
The application of laser welding technology improves the structural performance of aircraft and reduces the quality of the matrix.
Application of laser welding technology in shipbuilding
In the field of ship construction and repair, the most perfect laser welding technology belongs to the shipbuilding industry in Europe.
Under the new situation, in order to meet the needs of the development of ship lightweight, laser welding technology has been introduced into the ship manufacturing industry, quickly replaced the traditional welding technology, and improved the welding efficiency and quality.
In shipbuilding, laser welding technology is mostly used in ship deck and ship bulkhead.
In the shipbuilding industry, with the continuous improvement of laser welding technology by scholars, the application of laser welding technology in the shipbuilding field is gradually mature. For example, in submarine manufacturing, high-strength steel adopts laser cutting and laser welding. If the piston has defects during the operation of large low-speed machine, it can be repaired directly by laser welding to prolong the service life of the piston.
The introduction of laser welding technology in self-made shipbuilding industry has driven the reform of the shipbuilding industry.
After years of development, laser technology has been widely understood by people, and its recognition has been improved, which has promoted the application of laser technology.
As the focus of laser technology, laser welding technology is widely used in aerospace, shipbuilding, automobile and other industries, showing the broad future of laser welding technology.
It is believed that in the near future, laser welding technology will be more perfect, and gradually expand from the military and high-precision manufacturing field to the civil field, so as to promote the development and growth of the whole industry.