汽轮机空心静叶与内腔支撑板的塞焊工艺及其力学性能研究  

Study on Plug Welding Process for Steam Turbine Hollow Stator Blade and Van Damper Plate and Mechanical Properties of Plug Weld

作　　者：毛志刚 王烜烽 郝艳雄 苏化冰 

机构地区：[1]无锡透平叶片有限公司国家能源大型涡轮叶片研发中心,江苏无锡214174

出　　处：《热加工工艺》2017年第11期221-223,227,共4页Hot Working Technology

摘　　要：研究了一种用于汽轮机不锈钢(X2Cr Ni12)空心静叶本体(4 mm)与叶片内腔支撑板(2 mm)连接的塞焊工艺及其力学性能。结果表明,塞焊后的焊接接头熔深达1.0~1.8 mm,其母材硬度为169~207 HV1,焊缝与热影响区域的硬度为182~335 HV1。塞焊焊缝的拉伸剥离力随着塞孔底部直径的增大而增加,塞焊焊缝拉伸剥离强度约为269MPa。剥离后的试样断口为典型的解理断口,为脆性断裂,断口失效位置处于焊缝的热影响区,从河流花样的走向可以推断,其断裂起始位置位于焊缝边缘附近,并向塞焊焊缝中间扩展。The plug welding process used for the connection of 4 mm steam turbine stainless steel X2CrNil2 hollow stator blade with 2 mm van damper plate and the mechanical properties were studied. The results show that the penetration of the plug welded joint is 1.0-1.8 mm. The hardness of the parent material is 169-207 HV 1, the hardness of the weld zone and heat affected zone（HAZ） is 182-335HV1. The peeling force of plug weld increases with the increase of the bottom diameter of plug hole, and the tensile peeling strength of the plug weld is about 269 MPa. The peeling fracture is typical cleavage fracture, brittle fracture. The failure position of the fracture is in the heat affected zone of the plug weld. Inferred from the river pattern, the fracture starting position is located at the weld edge and it extends gradually to the middle of the weld.

关 键 词：汽轮机空心静叶 塞焊 焊缝组织 拉伸剥离试验 

分 类 号：TG444.7[金属学及工艺—焊接]