METHOD AND APPARATUS FOR INCREASING THE QUALITY OF THE WELD SEAM IN FRICTION STIR WELDING

摘要

Apparatus and method for increasing the quality of the weld seam in friction stir welding, with the following features: a) a receiving plate (1) with a drive head (2), the latter having a receiving flange (19) for receiving a holding bell (3) connected by means of a union nut (7) to a welding shoe (4) with a welding pin tip (5), b) the welding shoe (4) has a circular basic shape, on which there is a transverse web running over the cross section and rising at a right angle to said basic shape, said transverse web having a width of approximately 1/4 to 1/5 of the diameter of the basic shape and having an arc-shaped shoe sliding surface and shoe smoothing surface (9), c) the welding pin tip (5) has substantially a surface structure in the form of a tapering thread, this thread-like structure not being arranged in a purely circular manner.

主权项

1: A device for increasing the quality of the weld seam in friction stir welding, the device having the following features:
d) a receptacle plate (1) having a drive head (2), wherein the latter has a receptacle flange (19) for receiving a mounting bell (3) which by means of a union nut (7) is connected to a welding shoe (4) having a welding pin tip (5); e) the welding shoe (4) has a circular basic shape on which a transverse web, running across the cross section and rising orthogonally to this basic shape, is located which has approximately the width of ¼ to ⅕ of the diameter of the basic shape and has an arcuate shoe sliding face and shoe smooth face (9), wherein a small planar face in the form of a notch-type tapering (16) is located on each side of this face (9) in the region of the periphery of this face (9); f) the welding pin tip (5) has a surface structure which is substantially in the form of a heavily tapered thread, wherein this thread-like structure is not disposed so as to be purely circular but in each thread pitch has three flat spots which are distributed on the circumference, wherein the centers of these flat spots each are mutually placed at an angle of 120 degrees, and wherein the lead of this thread-like structure is 0.5 mm and the flank height varies from 0.25 mm to 0.05 mm.