| 摘要 |
<p>The invention relates to a resistance point welding apparatus for fixing a turbulence installation body to an inner wall of a steam generator pipe, having a welding head (1), which can be introduced into the steam generator pipe and comprises a largely cylindrical lance (11) consisting of an electrically conductive material, a point welding electrode (12), which projects out of the lance (11) in the radial direction, an effective element (13) and an insulation body (14), which is opposite the point welding electrode (12) in the radial direction and can be moved by the effective element (13) in the direction of the inner wall. The lance (11) is tapered at a defined distance from the welding head end in such a manner that the insulation body (14) and therefore also the point welding electrode (12) press the turbulence installation body against the inner wall of the steam generator pipe when the effective element (13) is activated. When a welding stream is impressed on the lance (11), a point-like welding stream flows via the point welding electrode (12) to a counter electrode (3) arranged outside the steam generator pipe.</p> |
