Novel method of laser transmission welding connection

Abstract

The utility model discloses a novel method of laser transmission welding connection, and belongs to the technical field of laser transmission welding, in particular to a laser transmission welding of mental and polymer. According to the novel method of laser transmission welding connection, chemical corrosion is performed towards the surface of metal material which will be welded so that concave pits can be formed in the surface and the appearance and shape of the surface will be changed. The surface corroded material is as the low layer light-suction material, and the polymer is as the upper layer light-suction material. The metal and the polymer are connected in overlapped mode. The metal and the polymer are clamped by restraint layer and are imposed with welding pressure. Semiconductor laser generator conducts laser transmission welding so that surface temperature can reach the melting point of the upper layer polymer rapidly and the surface melts. The molten polymer flows into the concave pits under the influence of welding pressure and an engaged interface which is in riveted structure is formed on the welding seam, accordingly the connection strength of laser transmission welding is improved. Besides, the novel method of laser transmission welding connection can be widely applied in the field of laser transmission welding requiring high connection strength.

Description

technical field [0001] The invention belongs to the technical field of laser transmission welding, in particular to a novel laser transmission welding method for metals and polymers. Chemical corrosion is used to form pits on the metal surface. During laser transmission welding, the molten polymer flows into the pits under the action of welding pressure, forming a riveting interface at the weld to increase the connection between the metal and the polymer. The contact area makes the metal and the polymer better combined with each other, so that the strength of the laser transmission welding connection can be improved. Background technique [0002] At present, laser transmission welding technology, as a high-tech processing technology with distinctive characteristics such as fast, accurate, non-contact, and small heat-affected zone, has been widely used in the field of welding processing of polymers and polymers, polymers and metals, and other materials of the same and differe...

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Problems solved by technology

The document "Experimental Research on the Laser Transmission Connection of PET Film and 316L Stainless Steel Sheet" pointed out that a chemical reaction occurred on the contact surface of the metal and polymer weld, and the metal and polymer surfaces were connected by chemical bonding, but their strength could not meet the ideal requirements. , if considering its process research, theoretically, the higher the power, the better. In fact, too much power will damage the quality of the weld seam. It is necessary to find a method that can significantly improve the strength of the laser transmission welding connection when the laser energy is moderate, so as to meet the actual requirements. High-strength requirements for packaging and other technologies in production

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