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近年来,曾采用各种方法修复磨损的ЗMЗ—53A发动机曲轴连杆轴颈和主轴颈。曲轴材料是BЧ50—1.5高强度球墨铸铁。铸造曲轴与钢锻曲轴相比,制造的劳动量显著减少,零件工作表面的耐磨性提高。 由于球墨铸铁对应力集中敏感性较低,因而其强度性能较高。此外,铸铁的低塑性使铸铁曲轴变形后不能校正。而它的白口化趋向、扭曲和裂纹的形成迫使必须寻找修复铸造曲轴的新方法,以便降低由堆焊引起的热应力。 目前,汽车修理企业中,修复铸造曲轴广泛采用以下几种堆焊方法:在液流中采用Ⅱ级弹簧钢丝振动电弧焊(B);在焊剂层下采用Hп—15ГСТЮЦА焊丝的电弧焊(Г);采用ПП—AH122粉末焊丝的双弧焊(П);在金属外壳中,采用合金焊剂层下的低碳钢丝的电
In recent years, various methods have been used to repair the worn ЗMЗ-53A engine crankshaft connecting rod journal and main journal. Crankshaft material is BЧ50-1.5 high-strength ductile iron. Casting crankshaft and steel forging crankshaft compared to significantly reduce the amount of labor-making, wear-resistant parts of the work surface increased. Due to the lower concentration of ductile iron sensitivity to stress, so its higher strength performance. In addition, cast iron low plastic deformation of the cast iron crankshaft can not be corrected. Its tendency to whiten, twist, and crack formation has forced the search for new ways to repair cast crankshafts in order to reduce the thermal stress caused by build-up welding. At present, a wide range of surfacing methods are used to repair cast crankshafts in the automotive repair industry. Class II spring steel wire arc vibration welding (B) is used in liquid flow; arc welding (Γ) with Hп-15ГСТЮЦА welding wire under flux layer, ; The use of ПП-AH122 powder welding wire double arc welding (П); in the metal shell, the alloy with a low carbon steel wire flux