Laser welding method for two clearance fit products

Abstract

The invention discloses a laser welding method for two clearance fit products. The laser welding method comprises the following steps of 1, fixing a small outer diameter product on a black steel column, wherein the small outer diameter product is synchronously rotated with the black steel column; 2, fixing a large outer diameter product on the black steel column, wherein the large outer diameter product is synchronously rotated with the black steel column, meanwhile, the large outer diameter product surrounds part of the small outer diameter product, and the surrounded area is the to-be-weldedarea; 3, simultaneously sleeving a silica gel tube section or a transparent polyester thermoplastic sleeve on the outer surface of the large outer diameter product and the small outer diameter product, and covering the to-be-welded area; and 4, installing the black steel column on a tool of a laser welding machine, and irradiating the to-be-welded area through a laser head. The laser welding method is suitable for laser welding between transparent or semi-transparent medical tubing, or laser welding between transparent or semi-transparent medical tubing and a balloon, and can also be suitablefor laser welding between transparent or semi-transparent non-medical tubing, all of which can meet the quality requirements of laser-welded products.

Description

technical field [0001] The invention relates to the technical field of pipe welding. More specifically, it relates to a method of laser welding of two loose fit products. Background technique [0002] At present, the connection between two pipes of medical catheters generally adopts methods such as adhesive connection, hot-melt welding, ultrasonic connection and laser welding. Among them, laser welding has the characteristics of beautiful appearance, high strength after welding, and good air tightness. Laser welding is widely used in transparent or translucent medical tubing, or in the welding of balloons and tubing. [0003] However, the current laser welding method and the welding process require that the welding parts between the two products that need to be welded be matched without clearance and interference fit, so as to ensure the strength, airtightness and aesthetic appearance of the welding. [0004] For the current laser welding, the production conditions are rel...

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Problems solved by technology

[0004] For the current laser welding, the production conditions are relatively strict, that is, the fit between the two products to be welded must be an interference fit or no gap fit, and corresponding tooling is required, so that the welding can meet the quality requirements of the product; but In the production process of medical catheters, in general, pipes are formed by extrusion, and the dimensional tolerances of the products are relatively large, especially for medical multi-lumen tubes or balloons, the shape or inner hole size The difference is relatively large, so it is difficult to ensure that when these tubes or balloons are used for laser welding, the fit between them is a gap-free fit or an interference fit; in addition, even if the product that needs to be welded can fit without a gap or interference Coordination, because the assembly is an interference fit, there are certain difficulties in production and assembly, and the production efficiency is also low

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