Method for welding tongue piece of automobile back windshield

Abstract

The invention discloses a method for welding a tongue piece of an automobile back windshield. The method not only requires low-cost equipments and has convenient application process but also overcomes the quality defects of the prior art. The method has following steps of: (1) making column-shaped soldering tin to be flat by adopting a knocking method or a pressing method, and cutting the flat soldering tin into soldering tin pieces matched with the size of the tongue piece for standby; (2) opening a self-air temperature-adjusting plastic welding gun for pre-heating and standby; (3) using a glass-fiber bar for wiping silver paste at the positions to be welded on the windshield surface so as to remove an oxide layer; (4) placing the soldering tin pieces on the welding position and putting the tongue piece on the position, and then rapidly adopting the welding gun to blow and heat the soldering tin pieces so as to complete the welding after melting the soldering tin; and (5) placing the windshield on a special frame for cooling after completing welding. The method is simple and practical and can be popularized easily.

Description

technical field [0001] The invention relates to a welding method for the tongue piece of the rear windshield of an automobile. Background technique [0002] As is known, the rear glass of automobiles needs to print silver paste, which is sintered into heating wires (used for defrosting of automobile glass in cold regions after electrification), and the general patterns of silver paste are as follows: figure 1 As shown, wherein 1 represents the rear glass of the automobile, 2 represents the silver paste, and the tongue 3 (the joint connecting the silver paste and the wire) is welded on the silver paste busbar 21. [0003] At present, the mature method of welding the rear bumper tongue of the automobile is to use a special tongue welding machine for welding. Due to the relatively strong professionalism, this special tongue welding machine is currently only produced abroad, and the price is about 300,000 RMB. This kind of equipment is not only expensive, but also has obvious ...

AI Technical Summary

Problems solved by technology

This kind of equipment is not only expensive, but also has obvious defects in use: first, this kind of welding machine adopts the spot welding method, that is, two welding pins withstand the two ends of the tongue for electric heating, so that the glass has only a very small two One point is heated, and the temperature reaches about 500°C. In this way, the local stress balance of the glass is destroyed due to rapid thermal expansion and contraction, so the strength of the welded glass decreases rapidly, and the probability of self-explosion will also increase; the second is this kind of welding. Because the method is automatic tin feeding, the solder wire is not processed and is in the shape of a cylinder, so the contact area with the tongue and glass is small, which is easy to cause virtual soldering, solder does not melt, and affects the stability of soldering; the third is that the surface of the silver paste is in the Exposure to air before soldering will be partially oxidized, so the soldering force will be affected, and the current soldering method does not have a process for treating the surface of the silver paste

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