| 摘要 |
1485571 Welding by fusion; making welding wire ACIERIES REUNIES DE BURBACHEICH-DUDELANGE ARBED SA 22 May 1975 [22 May 1974] 22088/75 Headings B3R and B3A A welding wire (Fig. 2) comprises a metallic tube (e.g. steel) 2 having a longitudinal weld seam, a powder core 6 and a strip 15 between the core and the tube partially surrounding the core below the weld seam. A protective layer of Al, Cu, Zn, Si, Mg, Mn, Ni may cover the tube while the core can include deoxidizing and denitrating metals such as Al, Mg, Si, Ti, Mn, alloying elements, slag and flux formers, gas-producing compounds and arc stabilizers. One process for producing a welding wire comprises forming an open channel from a steel band 2 by rollers 4, filling the ohannel with a loose powder 6 from a reservoir 7, placing inside the channel to partially surround the core an M-shaped strip 15 formed from a second metal band 12, drawing the composite through a die 20 to draw the edges of the channel together, passing the tube through a burner 21 to remove lubricant supplied by a lubricator 3 and to effect preheating, welding the tube along its seam with a welder 23 and drawing the wire through lubrioators 24, 27 and dies 25, 28 to give the desired diameter, preferably 0À6 mm. The M-shaped strip 15 may be of steel, plastics or paper. The strip 15 may have corrugations transverse to its length which are stretched out when the wire is drawn. The welder 23 can be resistance, induction, inert gas shielded arc, electron beam or laser. |
