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English
(1)Causes of black explosion points When the laser passes through the stain, a violent oxidation reaction will occur to form gas, which will directly affect the stability of the molten pool keyhole and form a black explosion point. Specifically, the molten pool keyhole is abnormally closed, resulting in insufficient melting depth, insufficient melting width, unmelted surface or direct penetration of the parent material, which requires metallographic cutting to assist in judgment.
Applicable scenarios and industries of laser welding 1.Heat conduction welding is mainly used for precision processing, such as visible edge processing of metal sheets, medical technology, etc.; 2.Deep penetration welding and brazing are mainly used in the automotive industry, among which deep penetration welding is used for car body, transmission, housing, etc.; brazing is mainly used for car body welding; 3.Laser conduction welding can process non-metals and has a wide range of applications. It can be used in consumer goods, automotive industry, electronic housing, medical technology, etc.; 4. Composite welding is mainly suitable for special steel structures, such as ship decks.
Actual case: After Volkswagen adopted laser-MIG hybrid welding technology, the efficiency of the body production line was significantly improved by 40%, while the weight of the body was reduced by 15%. This not only speeds up the production rhythm and reduces production costs, but also helps the energy conservation and emission reduction goals of automobiles, fully demonstrating the huge advantages and application value of laser hybrid welding technology in the field of automobile manufacturing.
Fiber laser is a laser that uses optical fiber to amplify and transmit the generated excitation light, and has a wavelength of 1070nm that is easily absorbed by metals. Among many lasers, it has a particularly high energy density and has the characteristics of easy convergence of the beam, and its major advantage is that it can achieve deep melting of metals. Compared with YAG laser, it has many advantages such as deep melting, low running cost, and almost no trouble and cost for adjustment and maintenance, and its popularity has accelerated in recent years. Although fiber laser has the characteristics of high power and high efficiency, if the power is too high in manual welding of sheet metal, it will cause danger to the operator, so the power is usually limited to about 1kW when making products. When pursuing higher power and greater penetration depth, mechanical welding and robot welding can be studied.
