Laser welding finned tube machine is laser deep penetration welding, welding is a more complex physical whole process, involving the interaction among laser raw material plasma technology. However, in the whole process of laser welding finned tube machine, the main parameters of welding standard such as laser output power, welding speed, defocusing amount and focus size are harmful to and decide the welding depth and other welding forming conditions, among which defocusing amount is one of the key influencing factors of welding bead.
At present, in the scientific research of the laser welding finned tube machine, it is known that the kinetic energy of the welding body can be calculated by the output power of the laser, the welding speed, the defocusing amount and the focus of the particle beam. The kinetic energy of welding body is directly related to the output power of laser, inversely related to welding rate, square meters with focus specification, and is related to defocusing quantity. The actual description is:
1.The kinetic energy of the welding body is proportional to the output power of the laser. The laser power increases with the increase of the output power of the laser, and the kinetic energy of the welding body also increases. Therefore, there will be a large amount of kinetic energy irradiance of particle beam to the bottom of the small round hole in unit time, and the irradiance heating effect of particle beam to the bottom of the hole will be improved. The more raw materials volatilized at the bottom of the hole, the heavier the weld bead.
2.The kinetic energy of the welding body is inversely related to the welding rate. With the acceleration of the welding rate, the less the irradiance time of the particle beam to the small circular hole, the less the kinetic energy of the welding body with irradiance in the small circular hole, the lower the volatilized raw materials at the bottom of the hole and the lighter the weld path.
3.In the whole process of defocusing, with the decrease of the distance between the focus of particle beam and the surface layer of the workpiece, the smaller the laser spot in the small circular hole, the larger the laser power, the greater the dynamic energy of the welding body, and the stronger the negative electron to the raw material at the bottom of the hole, The more raw materials volatilized at the bottom of the hole, the heavier the weld bead.
4.The weld bead is similar to linear transition with the kinetic energy of the welding body. The larger the kinetic energy of welding body, the more kinetic energy of particle beam irradiance accepted by the raw materials of the products in unit time and total area of the enterprise, the more volatile raw materials, and the heavier the deep hole and welding pass.
Aiermat laser welding machine for finned tube is the earliest one to carry out scientific research in China. The bonding rate of electric welding is above 95%, and the composition change is small.
