The patented SRM stud welding process in the radial symmetrical magnetic field (patent no.: 10 2004 051 389) in conjunction with the innovative HZ-1 universal weld stud featuring a plane end face and centering tip enables the safe and clean welding of weld studs up to M16. In this process, the use of ceramic rings is no longer needed (50% less welding energy in comparison with ceramic ferrule welding). The ratio between minimum sheet thickness and stud diameter is 1:10 instead of 1:4 as previous