Real-time temperature measurement device for friction stir welding

Abstract

The invention provides a friction stir welding real-time temperature measuring device. The device includes a friction stir welding main shaft (1) and a temperature measurement part; the temperature measurement part includes thermocouples, a temperature measurement bracket (2) and a temperature measurement circuit; the temperature measurement bracket (2) is fixedly installed on the friction stir welding main shaft (1); the temperature measurement circuit is installed on the temperature measurement bracket (2); and the friction stir welding main shaft (1) is provided with one or more temperaturemeasurement holes, the thermocouples are installed in the temperature measurement holes, and the thermocouples and the temperature measurement holes are correspond to each other. A temperature measuring method by using the friction stir welding real-time temperature measuring device is also provided. The device can directly bury the thermocouples in a rotating stirring tool, the temperature of awelding seam center can be measured by measuring the temperature of the stirring tool during welding, the distance of the thermocouples buried in the stirring tool from the welding seam center is lessthan 1 mm, so that the temperature of the welding seam center can be obtained accurately.

Description

technical field [0001] The invention relates to the field of welding engineering, in particular to a real-time temperature measuring device for friction stir welding. Background technique [0002] Friction Stir Welding (Friction Stir Welding referred to as FSW) was proposed by the British Welding Institute (TWI) in October 1991. The friction stir welding process was initially mainly used to solve the welding of low-melting point materials such as aluminum alloys. TWI has conducted more research on the characteristics and applications of the friction stir welding process. [0003] Friction stir welding technology is a solid phase welding technology, which has the advantages of low heat input, high efficiency, energy saving and high reliability, and is widely used in the aerospace field. However, in actual processing, due to workpiece processing errors, workpiece deformation, improper clamping, etc., the contact between the stirring tool and the workpiece during welding is co...

AI Technical Summary

Problems solved by technology

[0004] At present, there are mainly the following types of friction stir welding temperature measurement technology: (1) punch some small holes along the weld seam on the welding workpiece, and embed thermocouples for temperature measurement. This method needs to destroy the workpiece, and embed the thermocouple position There is a certain distance from the center of the weld (generally greater than the diameter of the stirring tool, approximately equal to 2-3 times the welding thickness), otherwise the thermocouple will be stirred into the weld, and the measured temperature will deviate greatly from the actual temperature of the weld center. Moreover, only the temperature changes at discrete points can be obtained, and the temperature at the center of the weld cannot be obtained continuously; (2) use infrared and other non-contact temperature measuring devices to measure the welding temperature, and the real-time temperature change curve of the center surface of the weld can be obtained, but due to These methods can only obtain the surface temperature of the object, so the measured weld seam temperature has a large deviation from the actual weld seam center temperature

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