| 摘要 |
The present invention relates to a method for manufacturing a bulb bar and also to a bulb bar produced in accordance with the method. The bulb bar is manufactured by steps of: separately rolling a bulb-part (2); separately rolling a flat bar-part (3); and welding the bulb-part (2) to the flat bar-part (3). The bulb-part (2) is rolled to a flangeless shape so as to enable a web-part (3) whose dimensions have been selected appropriately to a bulb bar (1) of requisite bending strength to be welded to a longitudinally extending edge region (8, 9) of the bulb-part and to enable heat generated during the welding process to be conducted into the bulb-part. The aforementioned longitudinally extending edge region includes bevelled surfaces (8, 9) which form respectively a longitudinally extending supportive and contact region and also a joint preparation for a subsequent welding process. |
