Research On The High-frequency Vibration Laser Welding Platform

In this paper, both vibration welding conditioning and laser welding development situation have been discussed. The applied range of vibration welding conditioning is not only narrow but also concentrated in both low frequency and traditional welding method. On the other hand, though laser welding is widely used, there are some defects in laser welded joints. Based on above, vibration welding conditioning and laser welding are combined in order to enhance the quality of laser welded joints, and expand the application of vibration welding in high-energy beam welding field. Furthermore, In consideration of the laser welding characteristics, for example, fast weld thermal cycle, narrow weld seam and high ratio of depth-to-width, a kind of giant magnstostrictive material exciter is used in order to substitute the existing eccentric gear exciter, meanwhile, increasing vibration frequency and concentrating the power of exciting force.The core of the control of vibration platform is equal to control exciter. The hardcore of the exciter is composed by GMM bar, exciting coil and magnetic components. Different laser parameters and vibration parameters are used in different size, shape and material properties. In order to expand the applied range of the exciter, the GMM exciter should work stably in wide frequency band, long term or short term work mode. Therefore, relevant parameters of exciting coil in both long term and short term work mode have been calculated separately, as well as the relation curve of frequency and current under constant voltage condition and the relation curve of current vibration acceleration under different frequency. Furthermore, in order to increase the frequency of exciter, ANSYS which is a kind of finite element analysis software is used to simulate the distribution of magnetic flux density. Thus, the distribution difference of magnetic flux density whether there is magnetic components is compared, and the distribution of magnetic flux density on axial direction is acquired.After determining the parameters of exciting coil, two kinds of control platforms are established. One of those is a kind of control platform which is based on function generator and audio amplifier. Meanwhile, the voltage, current and vibration acceleration of the GMM exciter should be collected separately. Another is a system including wave generator and vibration acceleration collecting software, which is based on LabVIEW, audio card and vibration acceleration collecting chip. With the advantages of strong computing power by computer and schematization, easy expansion, visual operation by Lab VIEW, it makes convenience not only on sitting parameters but also on recording the relation between time and vibration acceleration.In the end, the process effect of high-frequency laser welding is studied. On the one hand, the control system is examined. On the other hand, it proves that high-frequency vibration in conventional laser welding has an advantages in breaking dendrite, refining grain, increasing microhardness and minishing the tendency of microcracks.