A composite heat-generating friction stir welding tool

Abstract

The invention discloses a friction stir welding tool capable of compound heat production. The friction stir welding tool capable of the compound heat production comprises a hollow welding machine shell, a machine head shell, a first supporting frame and a second supporting frame which are fixedly connected with the welding machine shell and separate the welding machine shell into two containing spaces, a main motor which is fixed on the first supporting frame, a friction sensor which is fixed on the second supporting frame, a center shaft which penetrates the second supporting frame and the first supporting frame and is connected with the main motor in a transmission manner, and a pressure sensing system and an auxiliary heat production system which are arranged at the end of the center shaft. The friction stir welding tool is capable of providing the extra welding heat input for the friction stir welding, beneficial to shorten the preheating time and improve the welding efficiency and helpful for the metal material with higher melting point. Moreover, the deformation quantity of a workpiece can be reduced effectively by controlling the heat input of the resistance heat source reasonably during the welding of a thin plate, so that a welding connector of higher quality can be obtained.

Description

technical field [0001] The invention relates to non-ferrous metal welding processing technology, in particular to a composite heat-generating friction-stir welding tool. Background technique [0002] Since the invention of the friction stir welding method by the British Welding Institute, this technology has little welding deformation and residual stress, no need for protective gas and filling materials, can eliminate welding defects such as pores, inclusions, cracks, and does not generate arcs, smoke, dust, etc. At the same time, it can significantly reduce costs, save materials, optimize structures, and reduce the structural weight of aircraft, etc., which have attracted the attention of scientific research institutions in various countries. Because this technology has many remarkable features that other methods do not have, it will soon be used in the aerospace field, and this method is selected for the welding of the longitudinal seam of the core tank section of the new ...

AI Technical Summary

Problems solved by technology

Prior art 2 proposes a friction stir welding device. The stator of the torque motor is fixedly installed in the inner hole of the main shaft, which makes the whole device too bulky. In addition, there is no specific basis for the adjustment of welding parameters during the welding process.

However, the technical solution using the PID algorithm has a large time lag and overshoot, and many problems will arise.

In addition, none of the existing schemes deals with an important problem, that is, the deviation between the measured values ​​of pressure, vibration and torque and the real value, so no solution is given

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