Dry cooling device and cooling method for friction stir welding seam

Abstract

The invention discloses a dry cooling device for a friction stir welding seam. Cooling medium is in a close circular flow with a radiator by the aid of a left tube outside a trolley and a right tube outside the trolley, so that cooling process of the welding seam is continuous, dry cooling without direct contact of the cooling medium and the welding seam is realized, and cooling speed of the welding seam is increased by the aid of the cooling medium. In the mean time, the cooling medium is in a close circular passage, pollution of the cooling medium to the field is avoided, and cleaning and recycling of the cooling medium after welding are not needed.

Description

technical field [0001] The invention relates to a weld quality control method in the technical field of material connection, in particular to a friction stir weld dry cooling device and a cooling method. Background technique [0002] At present, there are mainly the following methods for cooling traditional friction stir welds: [0003] 1. Natural air cooling. This method has a slow cooling rate, which is likely to cause the growth of recrystallized grains in the weld nugget area, and a weld with satisfactory quality cannot be obtained. [0004] 2. Apply cooling medium directly. This is the only way to cool conventional friction stir welds. In this method, cooling media that can be applied include: liquid nitrogen, methanol, water, dry ice, or mixtures thereof. Among them, the liquid nitrogen cooling method is cumbersome to operate and requires a specific liquid nitrogen storage device; when methanol, water, dry ice and their mixture are used for cooling, not only the op...

AI Technical Summary

Problems solved by technology

Among them, the liquid nitrogen cooling method is cumbersome to operate and requires a specific liquid nitrogen storage device; when methanol, water, dry ice and their mixture are used for cooling, not only the operation is cumbersome, but a specific storage device is required, and methanol is not only poisonous and flammable, requiring corresponding Protection device, recovery device; when using water for cooling, it often results in too much water in the workbench

For example, in the methods disclosed in the Chinese patent application No. 200510105425.X and No. 200710097893.6, the mist of the cooling medium ejected from the nozzle will be suspended in the air, thereby inevitably accumulating on the workbench, polluting the welding site or even Affects the welding quality, so it must be equipped with an effective recovery device, which in turn increases the complexity of the cooling system

Images