| 摘要 |
<p>1322076 Welding by fusion STOODY CO 5 Oct 1970 [24 Nov 1969] 47178/70 Heading B3R An arc welding electrode for making a weld of stainless steel comprises a hollow tube of a steel alloy having a diameter of 0À045 to 0À30 inch and having a filler of a slag-forming material including first and second components in the form of metallic oxides or materials capable of yielding metallic oxides under the conditions of welding which are soluble in the slag, the weight ratio of the filler to tube being from 0À2:1 to 1À5:1 and the weight ratio of the filler to the alloying metals of which the electrode is formulated to give the desired weld deposit being from 0À15 : 1 to 0À65 : 1, the components of the filler being chosen so that the filler, or fusion or decomposition derivative thereof, has a stable or equilibrium moisture content at 70‹ F. and 90% relative humidity of less than 2À0 weight per cent, the filler including a fluoride in at least an amount corresponding to the level of moisture content of the filler as defined by a straight line extending from 0 : 0 to 4À0 : 0À50 on a %CaF 2 vs. %H 2 O plot. The steel may comprise up to 1% carbon and may be alloyed with at least 10% chromium. Other alloying metals specified are aluminium, molybdenum, nickel, titanium, tungsten, vanadium, zirconium, manganese, columbium, silicon, ferrochromium, ferrosilicon, ferrocolumbium, ferromanganese, ferromolybdenum. The first component of the filler may be alumina, titanium dioxide, silicon dioxide, manganese dioxide, asbestos, potassium titanate. The second component of the filler may comprise zinc oxide, barium oxide, calcium oxide, calcium carbonate, magnesium oxide, magnesium carbonate, cobalt oxide, calcium oxalate, strontium oxide, titanium dioxide, manganese dioxide, potassium oxalate, lithium carbonate, zirconium carbonate, zirconium dioxide, and gallium sesquioxide. The filler may include, as deoxidizing agent, from 0À5 to 2% by weight of chromium, tantalum, niobium, gallium, aluminium, silicon, calcium, lanthanum, manganese, vanadium, zirconium, beryllium, titanium, boron, barium, magnesium, strontium, lithium, actinium, ferrosilicon, ferrochromium or ferromanganese and as fluxing agent, calcium carbonate, calcium oxide, calcium fluoride or sodium oxide. The electrodes may be packaged before use under conditions restricting the moisture content and may be used with a "stick-out" of several inches. The slag forming material may be fused into vitreous particles prior to incorporation in the steel tube.</p> |
