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汽车、拖拉机等发动机中的气门,特别是排气门(常用材质为9铬锰2高合金钢)是在高温下工作,必须具有耐热、耐蚀、耐磨和致密的特点。因此,对磨损后的修复质量要求较高。几年来,针对上述特点和堆焊修复中易产生气孔、塌边等现象,经多次摸索实践,采用铜底模、水冷却的电磁吸革新模具,经手工电弧堆焊效果良好,工艺简便易行,成本低,质量好。焊机:交直流均可,如用直流焊机,焊条接正极。焊条:奥102或132(铬18镍9铌)焊条用前在200℃的温度下烘焙1小时。堆焊区的处理:用砂轮或砂布磨除堆焊区边缘及底部的杂质,使其露出金属光泽。然后
Valves in engines such as automobiles and tractors, especially exhaust valves (commonly made of 9-Cr-Mn-2 high-alloy steels) work at high temperatures and must be heat, corrosion resistant, wear resistant and dense. Therefore, the repair of wear after the higher quality requirements. Over the past few years, in view of the above characteristics and surfacing repair easy to produce stomatal, edge collapse and so on, after many exploration practice, the use of copper mold, water-cooled electromagnetic absorption of new molds, the arc welding by hand the effect of good, easy process Line, low cost, good quality. Welder: AC and DC can be, such as DC welding machine, then the positive electrode. Electrode: Austrian 102 or 132 (Chromium 18 Nickel 9 niobium) electrode baking at 200 ℃ for 1 hour before. Surfacing Area Processing: Abrasive padding area with the edge of grinding wheel and the bottom of the impurities, so that it is exposed metallic luster. then