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The principle of laser welding and its application


Limited to the laser material area, and then through heat conduction, heat transfer from the high temperature to low temperature. 220G welding characteristics of steel and 20Q2NiA laser welding steels of the main process parameters including laser power,[link widoczny dla zalogowanych], welding speed, defocus and protection of the most gas flow, a reasonable choice of these parameters on f dissimilar steel welding quality is very important. Below to 20G and 20CrNi. A study as research subjects. _r Ensure the accuracy of the assembly, welding end requirements straight, finishing, chamfering and burr-free clean-ho, roughness less than Ra6.3, flatness small dry 0.04ram. Beam welding required to travel along the gap at the welding process is not continuous or otherwise unable to continue. At the same time as the anti-l Bu welding process caused by deformation of the upper and lower, left and right dislocation, steps must be taken to clamp. Laser welding speed is constant, the laser power is too high, more serious burning molten weld metal, weld and heat affected zone is very wide, weld surface-degree horizontal and vertical, with the laser to help reduce the rate of the weld The roughness decreases, the surface state can be changed, when the welding power is too small, narrow weld, easy to show continuous rain did not like. When the other parameters constant, the gas flow is small, more serious burning molten weld metal, weld and heat affected zone is very wide, horizontal and vertical weld surface roughness large,[link widoczny dla zalogowanych], with the gas flow from small to big changes weld roughness decreases, the surface state can be changed. However, excessive side-blown gas flow from time to time, narrow the weld, easy to show continuous rain did not like. Welding welding speed directly affects the penetration depth. Dissolved in the deep welding, welding speed is limited by effects due to holes. Laser welding, heat input can be used to describe the radiant energy of laser welds of the situation. Line energy is defined as: acceptable weld per unit length of laser energy. Large welding speed,[link widoczny dla zalogowanych], weld heat input is small, penetration decline; the other hand, can achieve greater penetration. In the lower welding speed, welding speed increases with the penetration depth is significantly reduced. In the welding speed exceeds a certain value, further increase the welding speed on penetration of gradually weakened, and this is Wyatt, laser welding can be achieved under high speed deep penetration welding. Laser welding of dissimilar steel 20G and 20Cr2Ni4A the weld, the weld zone of all is the martensite. Both sides of the heat affected zone is not ... To the left HAZ moderate changes in the transition, the larger the heat affected zone, heat affected zone of the right quite big changes. Relatively small heat affected zone. The maximum hardness value appears on the weld, biased 20Cr2Ni4A one example, the hardness of heat affected I {Di in the weld, lower than the matrix. The 20G side of the heat affected zone hardness is relatively large, f higher than the mother village. 3 Conclusion laser welding process compared with other traditional welding has many advantages. One of its main advantage is the ability to focus the laser beam thousands of very small region, resulting in high energy density heat source, then quickly swept by the concentration of heat welded seam, in this respect, the laser beam welding with electron beam comparable to welding,[link widoczny dla zalogowanych], laser welding, but it has the characteristics of electron beam welding is better than that F laser welding can be carried out at atmospheric pressure, without vacuum chamber. Through the windows, lenses and fiber, can achieve more than a remote location with table of laser welding, and laser welding can also e-beam welding rod and three-dimensional structures can not be achieved within the tiny area of ​​implementation. With similar electron beam welding, laser welding and double side welding can shape the stratified structure of the laser welding can be taken to one side, so, for those who use other methods to be welded from both sides of the joints, if the laser welding process, 0 welding from one side. This flexibility opens up the joint design of many new ideas, especially for some of the included non-contact surface of the component. As an application of laser welding technology is still in its initial stage,[link widoczny dla zalogowanych], but it has been shown in many industries ttj strong advantages, such as welding quality, speed up production cycles and the total manufacturing cost savings. This unique technology may dramatically change the weld production and improve the economic efficiency of business. Welding technology by the manufacturer, the competition will be greater benefits.
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