航空发动机薄壁机匣疲劳裂纹修复焊接变形控制  

Control of deformation for fatigue crack repair in combustion chamber case shell on aeroengine

作　　者：高双胜[1,2,3] 曲伸[2] 杨烁[2] 李晓光[2] 陆善平[3] 李英[2] 周冠男[2] 

机构地区：[1]沈阳航空航天大学材料科学与工程学院,沈阳110136 [2]中航工业沈阳黎明航空发动机(集团)有限责任公司,沈阳110043 [3]中国科学院金属研究所沈阳材料科学国家(联合)实验室,沈阳110016

出　　处：《焊接学报》2016年第4期95-97,123,共4页Transactions of The China Welding Institution

基　　金：辽宁省自然科学基金资助项目(2014024009)

摘　　要：分别采用恒定直流TIG焊、脉冲直流TIG焊、微束等离子弧焊等方法对航空发动机材料K4169试板进行了焊接试验,经测试脉冲直流TIG焊接头力学性能最优,采用该方法对机匣支板头通气孔附近的裂纹进行了修复试验,测试了裂纹所在支板头对应的内外环安装边的径向距离和距基面的距离,分析了热处理对焊接变形的影响.结果表明,机匣支板头通气孔附近的疲劳裂纹修复,导致机匣发生了径向伸缩和周向扭曲变形.热处理对于薄壁机匣疲劳裂纹修复后焊接应力的消减起到重要作用,可有效地减小焊接变形,保证装配精度.Constant DC TIG welding,pulsed DC TIG welding and micro-plasma arc welding methods were used respectively to weld a type of aero-engine material of K4169 plate.The result demonstrated that the pulsed DC TIG welded joints have the optimal mechanical properties.The fatigue crack near the vent hole on the end of gearbox supporting plate were repaired by using the pulsed DC TIC welding,the radial distance and the distance from the base surface of internal and external hoops flange of the end of cracks located plate corresponded were measured and the effect of heat treatment on welding deformation was analyzed.The results illustrated that the repair of fatigue cracks near the vent hole of the end of gearbox supporting plate lead the radial expansion and circumferential distortion deformation occurred on the gearbox.Heal treatment will improve a significant function on the reduction of welding stress of repaired fatigue cracks of thin shell gearbox,which can reduce the welding deformation effectively and guarantee assemble dimension accurately.

关 键 词：机匣 疲劳裂纹 修复 焊接变形 热处理 

分 类 号：TG404[金属学及工艺—焊接]