不锈钢烧结网滤芯TIG焊工艺研究  

Study on TIG Welding Process of Stainless Steel Sintered Mesh Filter Element

作　　者：郭雨菲 侯宗宗 赵斌 GUO Yufei;HOU Zongzong;ZHAO Bin(Luoyang Ship Material Research Institute,Luoyang 471000,China)

机构地区：[1]中国船舶集团有限公司第七二五研究所,河南洛阳471000

出　　处：《电焊机》2023年第5期95-98,106,共5页Electric Welding Machine

摘　　要：不锈钢烧结网滤芯是液压、机械、船舶、冶金等行业自动反冲洗过滤器的关键部件,其纵向对接焊缝的焊接质量直接影响着滤芯的过滤精度和自动反清洗装置的平稳运行,是不锈钢烧结网滤芯生产过程的关键环节。采用钨极氩弧焊,使用专用焊接工装,对多层不锈钢烧结网滤芯纵向焊缝进行焊接,探寻合理的焊接工艺参数,利用光学显微镜、显微硬度仪、能谱仪分析了焊缝金属的组织性能、凝固模式和物相组成。结果表明,采用钨极氩弧焊,通过控制焊接热输入量,提高焊缝背面冷却速度等方法,可以得到成形良好、无断丝、无明显缺陷的不锈钢烧结网焊接接头,观察焊缝成形情况,确定较优的焊接电流为90~95 A,所得焊缝组织为柱状奥氏体及骨架状铁素体组织,该组织具有较优的抗裂纹扩展能力。The stainless steel sintered mesh filter element is a key component of automatic backwash filters in hydraulic,mechanical,shipbuilding,mechanical and other industries.The welding quality of its longitudinal butt weld directly affects the filtering accuracy of the filter element and the smooth operation of the automatic backwash device.It is a key link in the production process of stainless steel sintered mesh filter elements.TIG welding and special welding tools are used to weld the longitudinal weld of multi-layer stainless steel sintered mesh filter element to find reasonable welding parameters.By optical microscope,microhardness tester and energy spectrometer,the microstructure properties,solidification mode and phase composition of the weld are analyzed as well.The results show that by controlling welding heat input and improving the cooling speed of the back of the weld,the welded joint with good shape,no broken wire and no obvious defects can be obtained by TIG welding.Observing the appearance of the weld,the optimal welding current is determined to be 90~95 A.The microstructure of the weld is columnar austenite and skeleton-like ferrite,which has excellent crack propagation resistance.

关 键 词：不锈钢烧结网滤芯 钨极氩弧焊 焊接工艺 焊缝组织 

分 类 号：TG444.74[金属学及工艺—焊接]