| 摘要 |
PURPOSE:To reduce percentage of water content of a covered electrode remarkably by placing a core wire for covered electrode in a coating booth, electrostatic coating powdery flux to which powdery adhesive is added on the outer periphery of the core wire, and baking the flux. CONSTITUTION:A core wire 2 for covered arc welding is held by a holding device 12 and placed in horizontal position in a coating booth 18. Porous ceramic plates 16 are placed in the lower part of the booth 18. Electrodes 15 are provided on the plates at a fixed distance to generate strong electric field between grounding wires 14. When air is blown from an air inlet 17, and flux component placed on the ceramic plates is blown up to form a primary fluidized bed 19, the powdery body is ionized and charged negative, and adheres to the outer periphery of the grounded core wire 2 to form a covering layer 18. Thus, the core wire 2 runs while forming the covering layer 18 and goes out from the booth 18. After completion of coating, the core wire 2 is baked by heating. |
