Abstract: The invention relates to an orbital friction welding method and a friction welding device for welding workpieces by means of friction welding units, wherein the workpieces are pressed against each other in the contact plane during the application of the oscillation energy. To this effect, n>1 friction welding heads are mounted, in a stationary manner, at least on one side of the contact plane in an orbital plane, in the area of the workpieces so that the n>1 friction welding heads, respectively facing one side, are oscillated with the same friction frequency, the same amplitude and the same preset phase position.

Abstract: For the manufacture of miter-welded profile rod frames by friction welding, a welding apparatus with friction welding units is used with which permits the welding of all miter joints of a frame to be made concurrently within a very short period and with very little displacement of welding material.