| 摘要 |
In the method of manufacturing a continuous powder-filled tubular welding electrode, a strip of metal is initially shaped into an open channel and subsequently into a tube by abutting the edges of the strip. The edges are then welded to one another. The powder falls from a hopper into the tube which is fed downwards at the weld spot. The falling powder falls past the weld spot. The speed of the falling powder at the weld spot is higher than the speed of the tube, e.g., the speed of the falling powder is twice the speed of the tube. The powder which is subjected to the welding heat for a very short period of time fills the welded tube below the weld stop in step with the speed of the tube. Subsequently, a suitable reduction of the cross-sectional area of the powder-filled tube takes place. |
