The present invention relates to a welding auxiliary joining part (1) with which a welding connection, more particularly a resistance welding connection, can be produced between a first component A made of a difficult-to-weld material and a second component made of weldable material. The welding auxiliary joining part is characterised by a cylindrical punch shaft (10) that can be punchingly pressed into the first component A almost without rotation. The punch shaft (10) has an element head (30) on the head underside (34) of which only a continuous circumferential clamping ring (40) that projects axially in the direction of the punch ring (10) is arranged.