Laser welding shielding gas device

Abstract

The invention discloses a laser welding shielding gas device. The laser welding shielding gas device comprises a gas knife assembly, a connecting support, a gas cavity, a gas cavity pipe joint, a high-temperature-resistant nozzle, a gas homogenizing filter plate and a gas flow guide plate. The gas knife assembly is installed above the connecting support. The upper portion of the gas cavity is installed below the connecting support in a seamless manner. The gas homogenizing filter plate is located below the gas cavity and is in interference fit with the inner wall of the gas cavity. The gas cavity pipe joint is installed on the outer side wall of the gas cavity. The upper end of the high-temperature-resistant nozzle is in interference fit with a through hole in the middle of the top wall ofthe gas cavity. A through hole is formed in the position, facing the upper end of the high-temperature-resistant nozzle, of the connecting support. The lower end of the high-temperature-resistant nozzle is in interference fit with a through hole in the middle of the gas homogenizing filter plate. The gas flow guide plate is located below the gas homogenizing filter plate. Laser penetrates througha hollow channel of the high-temperature-resistant nozzle to weld a welding workpiece, and meanwhile, shielding gas enters the gas cavity from the gas cavity pipe joint and then penetrates through the gas homogenizing filter plate to provide a large-range shielding gas atmosphere for a weld joint. The laser welding shielding gas device can disperse photoinduced plasmas in a laser channel.

Description

technical field [0001] The invention relates to the technical field of laser welding, in particular to a laser welding shielding gas device. Background technique [0002] Laser welding is a welding method in which a high-energy laser beam is used as a heat source, and the radiation is heated to the surface of the material, and the material is melted and connected through heat conduction. Because laser welding has the advantages of high precision, high efficiency, small heat-affected zone, and small deformation, it has a good development prospect. With the continuous development of laser technology and numerical control technology, laser welding has become an advanced processing method in the field of industrial plate welding. [0003] In the laser welding process of high-performance materials titanium alloy, aluminum alloy, stainless steel and other metal alloy materials used in aerospace and medical applications, in order to avoid the high-temperature weld seam from being ...

AI Technical Summary

Problems solved by technology

[0009] The coaxial nozzle shielding gas device mainly has the following problems: (1) The shielding gas coverage is relatively small. During high-power and high-speed laser welding, the weld seam loses gas protection when it is still at high temperature, and the welding effect is relatively poor.

(2) Disturbance of welding protection airflow will affect weld formation

[0010] The coaxial gas hood protective gas device mainly has the following problems: (1) The gas homogenization filter plate on the annular gas hood is close to the welding seam, and the spatter generated by laser welding will block the tiny flow channels in a short period of time. lead to annular gas hood failure

(2) The upward airflow of the coaxial gas nozzle causes the photoplasma generated during the high-power laser convergence to flow along the direction of the airflow, and in severe cases, the laser welding head will be burned

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