Abstract: An apparatus for the adhesive fixing of a joining part (11) to a resilient workpiece joining point (13) function in such a way that by means of a compensating device (20) the yielding of the joining point (13) is determined according to distance and/or position change and is taken into account during the smoothing adapting of the joining point (13) and during the attachment of the joining part (11) and consequently eliminated. This makes it possible to obtain a high joining quality and constancy.

Abstract: The rotary cutting tool is used for making holes in walls of thermoplastic materials, e.g. fuel tanks produced by the blowing process. Cutting blades pointing roughly in the axial direction are placed on the free end face of a circular, rotary tool member and said cutting blade score and displace, instead of cutting the material. The cutting blades are arranged at a drawing angle to the axial direction and slope to the inside or outside, depending on whether a burr is or is not required on the opening edge. A holding device in the form of a mandrel or pin ensures that the cut out circular disk does not drop into the container. Thus, a cut is made, which is suitable for further processing by welding on connections or fitting seals and produces no chips and waste which could fall into the container.

Abstract: A welding apparatus for welding covers to containers, such as battery casings by pressing the cover on to the casing is provided with a testing device which includes a connector adjacent the pressing-on device and adapted to connect with an opening in the cover. The testing device is adapted to monitor the pressure inside the container after the latter has been charged with fluid under pressure at the end of the welding operation. Any fall in pressure is indicative of a leak at the welded seam.

Abstract: A method and apparatus are disclosed for welding a plurality of flexible, elongated members, such as thermoplastic members, at their respective end points to form a frame. One-half of the members are arranged in receptacles in a holder with all the members being in a generally U-shaped configuration and in side-by-side relationship to one another. The remaining members are arranged in receptacles in a second holder which lies adjacent the first holder, with all members in this holder also being in a generally U-shaped configuration with one member partially surrounding all the other members which are situated in side-by-side relationship to one another within the U-shaped mouth of the member surrounding them.