Abstract: A friction welding tool for friction welding can be controlled with respect to measuring accuracy based upon the temperature in the weld zone. This is attained by determining the temperature values of the weld zone by way of a temperature sensor, which is arranged with its measuring point in the pin of the stir welding tool.

Abstract: The object of the invention is to create a friction welding tool for friction welding that can be controlled with respect to measuring accuracy based upon the temperature in the weld zone. This object is attained in accordance with the invention by determining the temperature values of the weld zone (6) by means of a temperature sensor (7), which is arranged with its measuring point in the pin (4) of the stir welding tool (1).

Abstract: A method for friction stir welding using liquid cooling. The method includes the steps of moving a pin tool across a welding location, spraying a cooling liquid in a localized manner from a cooling ring moving with the pin tool onto a trailing region and onto lateral regions of the welding location adjacent to the pin tool, and blowing cooling gas from a gas jet moving with the pin tool from a front of the pin tool against the pin tool and against the cooling liquid emerging from the cooling ring. In addition, a friction stir welding and cooling device includes a pin tool configured to move across a welding location and a cooling ring at least partially encircling the pin tool. The cooling ring is configured to move simultaneously with the pin tool across the welding location and includes a plurality of nozzles configured to spray a cooling liquid.

Abstract: The aim of the invention is to achieve a method for friction stir welding, whereby the welding of alloys with high oxygen affinity and/or high plasticisation energy is possible and the heat flux from the welding location is easily controlled. Said aim is achieved whereby the cooling liquid from a cooling ring (2), moving with the pin tool (1), is physically limited to being sprayed on the trailing region and the lateral region of the welding location adjacent to the pin tool (1). Additionally, a gas jet (3) moving with the pin tool (1), blows cooling gas from the front against the pin tool (1) and against the cooling water escaping from the cooling ring (2).