| 摘要 |
1,057,852. Making electrodes; bending; welding by fusion. HARNISCHFEGER CORPORATION. Aug. 30, 1963 [Oct. 12,1962], No. 34458/63. Headings B3A, B3E and B3R; An arc welding electrode is made by closing a strip to a channel section extruding a flux core into the channel section at a rate which varies with the velocity of the strip; and closing the channel section about the flux core. The strip is pulled by feed rolls 9, one of which is rubber surfaced, from a reel 1 and passes through driven forming rolls 10, 11 which form it into a channel section. The section is guided under a volumetrically controlled extrusion press which extrudes a core of flux into the section which is closed by two pairs of idler rolls 16, 17 on vertical axes and two pairs of driven rolls 18, 19 on horizontal axes. If desired the strip edges are welded by a high-frequency resistance welding unit 20 before being coiled on a driven drum 6. The hydraulic motor driving the drum 6 and the hydraulic motor driving the rolls 9, 10, 11, 18, 19 are so adjusted that the strip is under tension. A wax lubricant, may be applied to the under, surface of the strip 2 before it is fed to the forming rolls. In a modification the channel section is closed by a fixed die located adjacent the extruding point. The electrode may be of low hydrogen type and be baked after coiling. The flux may include alloys, sodium alginate and potassium silicate. |
