Welding units are supplied in two standard versions. Rotary-linear (STW-RL) or linear only (STW-L). The advantage of the rotary-linear welding unit is that it can perform the complete welding process along a mechanically defined circle fully automatically. The great advantage of the welding units is the high accuracy and parameterization of the units, thanks to which it is possible to weld very thin materials without marking the visible side of the weld. The units allow for various welding methods and have great flexibility in setting. The result is very precise and stable welded joints, which are essential for thin-walled materials.