A machine for ultrasonic welding having at least one guided welding horn, wherein a sonotrode tool is held on a holder at the zero point of the sonotrode tool and is guided along a weld seam to be produced, and wherein the holder also forms a support for a spray nozzle which is mounted at an acute angle to the sonotrode tool.

A heat sink for use in induction welding includes a number of tiles, wherein the tiles are electrically non-conductive and have a thermal diffusivity of greater than about 25 mm2/sec. A joint flexibly joins the tiles together.

A preheating arrangement includes a preheating device defining a first plane by a first centerline along a first axis and a second centerline along a second axis perpendicular to the first axis. A first preheating structure is asymmetric with respect to the first and/or the second centerline. A second preheating structure is oriented like the first preheating structure such that, when viewed along a third axis perpendicular to the first plane, the preheating structures are arranged one above the other. A first actuator rotates the preheating device between first and second positions and the preheating structures in the first position have a first orientation and in the second position a second orientation rotated around the axis of asymmetry by 180 or in which they are rotated by an angle in the range of 0<<360, or 90270 or =180 around the third axis compared to the first orientation.