Laser welding is a key application of laser processing technology. It utilizes the radiation energy of lasers to achieve effective welding. Its operating principle is to excite a laser-active medium (such as a mixture of CO2 and other gases, or YAG yttrium aluminum garnet crystals) in a specific manner, causing it to oscillate back and forth within a resonant cavity. This stimulates the formation of a stimulated radiation beam, which, when it contacts the workpiece, absorbs its energy. When the temperature reaches the material's melting point, welding can occur.

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(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.