Method for friction stir connection of steel plate with thickness of 5 mm

Abstract

The invention discloses a method for friction stir connection of a steel plate with a thickness of 5 mm. The method is characterized by comprising the following steps: firstly, small holes are drilled in a steel plate connecting area, the diameters of the small holes are 1.5 mm, the depths are 1 mm, and the arrangement of the small holes is determined according to the width of the steel plate connecting area; then, mixed medicine powder of Fe powder, Cu powder and gunpowder is filled in the small holes, wherein the gunpowder is 60-70% of the total volume, the Fe powder is 20-30%, and the Cu powder is 5-10%; thirdly, two plates to be connected filled with the mixed medicine powder are fixed on a worktable side by side, and then, a circular pressing plate is driven to quickly rotate to form sealed space between the small holes and the circular pressing plate to urge explosion of the gunpowder in the mixed powder to generate a certain heat; and finally, a stirring head is driven to rotationally advance at high speed, and the explosion heat is used for plastifying metal in the connecting area and extruding to form the connecting area so as to finish the friction stir connection of the plates. The method is simple, excellent in effect and excellent in mechanical performance of the obtained connecting area.

Description

technical field [0001] The invention relates to a new process of friction stir joining of 5mm steel plates, specifically a method of plasticizing the materials in the joining area by means of the explosive heat of small holes in the joining area plus the heat of stirring with the stirring head, and friction stirring with the forming connection method. Background technique [0002] Friction stir joining technology is widely used in non-ferrous metals such as aluminum alloys and magnesium alloys. However, friction stir joining technology for steel materials is rarely used. The main reason is that the heat generated by the plasticization of steel materials is high, and the material of the stirring head itself is high. Generally, it is easy to Damage to the mixing head, resulting in increased costs. In the present invention, the heat generated by the explosion of the small-hole gunpowder and the stirring heat of the stirring head are quicker and easier to plasticize and flow th...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the friction welding of 5mm steel plate is difficult and the friction stir head is easy to be damaged, and to invent a method to increase the stirring temperature of the material in the connection zone through the explosive explosion of the small hole in the connection zone, so that the metal in the connection zone can be more easily plasticized, so as to realize the 5mm steel plate method of frictional connection

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