the short leg fig2 a additionally shows still in the separated state two approximately t shaped plastic fastening elements 7 with a fastening leg 9 each and with a locking leg 8 arranged at right angles thereto which are arranged such that the fastening leg 9 extends through the opening 6 in the respective sheet metals 1 and 2 and can be brought into direct connection with the plastic element 3 finally fig2 b shows the two plastic fastening elements 7 pushed into the openings 6 and a weld seam 10 prepared by means of ultrasonic welding between the fastening elements 7 and the plastic element 3 so that a stable fastening is obtained on the whole between the two sheet metal parts 1 and 2 and the plastic element 3 all the sheet metal parts shown here may be designed according to the present invention both as deep drawn sheet metals as punched sheet metals or even as u201c tailored blanks u201d in addition it is also possible to use sheet metals that were manufactured e g by means of forging processes such as laser cutting plasma cutting water jet cutting or torch cutting fig3 shows another variant of a design of a force connection strut according to the present invention this comprises an approximately h shaped plastic element which is composed of the central leg 33 and the two peripheral legs 34 and 35 the central leg 33 is arranged at right angles to the two peripheral legs 34 and 35 arranged in parallel and is rigidly connected to these the first peripheral leg 34 has a stop 37 each on the inner side whereas the second peripheral leg 35 has.