| 摘要 |
A heating-element in a welding device for heating up plastic molded parts region by region during the welding operation is proposed, comprising at least two shell-shaped heating elements (2, 3) resting on the outside on the plastic molded parts in the region of the weld, the heating elements being of a rotationally symmetrical design, each heating element (2, 3) having a central region (7) and two edge regions (8, 9) arranged adjacently on both sides of the central region in the axial direction and designed in an axially symmetrical manner, and the edge region being formed from a material which has a lower thermal conductivity than the material of the central region.
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