Device and method for double-shaft shoulder FSW (Friction Stir Welding) based on temperature feedback of leader region

Abstract

The invention discloses a device and a method for double-shaft shoulder FSW (Friction Stir Welding) based on temperature feedback of a leader region. The device comprises a stirring head, a clamp holder and a handcart, wherein the stirring head is arranged on a machine head in a clamping way through the clamp holder, the machine head is fixedly provided with a semicircular arc magnetic steel piece, the clamp holder is provided with high-speed proximity switches in the circumferential direction at intervals every 90 degrees, the stirring head comprises an upper shaft shoulder, a lower shaft shoulder and a stirring needle which is located between the upper shaft shoulder and the lower shaft shoulder, the upper shaft shoulder is provided with sheathed thermocouples in the circumferential direction at intervals every 90 degrees, the radial directions of end points of the sheathed thermocouples are respectively parallel to the radial direction of a setting point of the corresponding high-speed proximity switch after the stirring head is provided with the clamp holder, and the sheathed thermocouples are connected with a controller through a wireless transmission module. The method is characterized by dynamically adjusting the welding speed and the rotating speed of the stirring head through the sheathed thermocouples and pressure spring type thermocouples. According to the device and the method for the double-shaft shoulder FSW based on the temperature feedback of the leader region, disclosed by the invention, the structure is clever, the detection accuracy is high, the welding speed is dynamically adjusted through dynamically detecting the temperature of a welding workpiece, and the welding accuracy is high.

Description

technical field [0001] The invention relates to the field of metal material processing, in particular to a dual-shaft shoulder friction stir welding device and method based on temperature feedback. Background technique [0002] Double shoulder friction stir welding technology is a new type of welding technology. This welding technology uses a stirring needle to connect the upper and lower shoulders, and the stirring needle rotates synchronously with the upper and lower shoulders during the welding process. Therefore, the friction stir welding process of double shoulders produces a large amount of heat. , welding speed is fast, and multi-position welding can be carried out; but it is also the characteristic of large heat production that causes overheating of the metal in the welding area, which directly affects the welding quality, such as coarse grains in the welding area, increased defects, and even directly leads to deterioration of the surface molding ; If the heat input ...

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Problems solved by technology

[0002] Double shoulder friction stir welding technology is a new type of welding technology. This welding technology uses a stirring needle to connect the upper and lower shoulders, and the stirring needle rotates synchronously with the upper and lower shoulders during the welding process. Therefore, the friction stir welding process of double shoulders produces a large amount of heat. , welding speed is fast, and multi-position welding can be carried out; but it is also the characteristic of large heat production that causes overheating of the metal in the welding area, which directly affects the welding quality, such as coarse grains in the welding area, increased defects, and even directly leads to deterioration of the surface molding ; If the heat input is reduced rashly, the temperature of the welding area will be lowered, the forward resistance will increase, and the stirring needle will break

[0003] At present, in the friction stir welding process, the means used to control the welding heat production are mainly: adjusting the welding speed and the spindle speed. The usual method is to set the welding parameters before the welding starts. During the welding process, these welding The parameters cannot be changed; what is more worth mentioning is that there is no real-time feedback control means for welding process parameters such as the temperature of the welding area. When welding quality problems occur, the operator cannot adjust the welding parameters in a timely and effective manner.

[0004] How to use the temperature of the welding area as feedback to adjust the stability of the welding process by adjusting the spindle speed or welding speed? There is no clear solution to this problem

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