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  • The Classification Of Laser Welding
    Jul 11, 2018

    Laser welding is one of the important aspects of the application of laser material processing technology. In 70s.20 century was mainly used to weld thin wall materials and low speed welding. The welding process belongs to the heat conduction type, that is, the laser radiation heating the workpiece surface. The surface heat is directed through the heat transfer to the internal diffusion, and the width, energy, peak power and repetition frequency of the laser pulse are controlled by controlling the width of the laser pulse. The rate and other parameters make the workpiece melt and form a specific weld pool. Because of its unique advantages, it has been successfully applied to the precision welding of micro and small parts.

    First, according to the control mode can be divided into: manual laser welding machine, automatic laser welding machine, vibrotype laser welding machine 

    two, according to laser can be divided into: YAG laser welding machine, semiconductor laser welding machine, optical fiber laser welding machine.

    There are two basic modes of laser welding: laser thermal conductivity welding and laser deep fusion welding. The laser power density of the former is lower (105 ~ 106W / cm ~ 2). After absorbing the laser, the workpiece can only melt the surface, and then rely on the heat conduction to transfer heat to the workpiece to form the melting pool. The welding mode is of shallow depth and relatively small depth and width. The latter has a high laser power density (106 ~ 107W / cm ~ 2), the workpiece absorbs the laser and melts and even vaporizes quickly, and the molten metal forms a laser beam with small holes under steam pressure that can shine directly at the bottom of the holes, making the holes continuously extend. Until the pore vapor pressure and liquid metal surface tension and gravity balance. When the hole moves along the welding direction with the laser beam, the molten metal in front of the hole flows around the hole to the rear, and the weld is formed after solidification. This welding mode has a large penetration and a large ratio of depth to width. In the field of mechanical manufacturing, in addition to those small parts, the general choice of deep welding.

    Metal vapor and protective gas produced by deep penetration welding are ionized by laser, and plasma is formed inside and over the hole. The plasma absorbs refracts and scatters the laser so the plasma above the molten pool generally weakens the laser energy to the workpiece. The focusing effect of the beam is affected, which is unfavorable to welding. The plasma can usually be removed or weakened by a side blow. The formation of small holes and the plasma effect make the process of welding accompanied by characteristic sound, light and electric charge. The relationship between them and welding specifications and weld quality is studied. It is of great theoretical significance and practical value to monitor the process and quality of laser welding by using these characteristic signals.