焊接材料对9Ni钢焊接接头组织与性能的影响  

The Effect of Welding Material on Microstructure and Properties of Welded Joint of 9Ni Steel

作　　者：顾伟[1] 王德伟[2] GU Wei;WANG De-wei(Department of Mechanical Engineering,Anhui Technical College of Mechanical and Electrical Engineering, Wuhu Anhui 241000,China;Welding Laboratory, Anhui Jinding Boiler Limited Company Wuhu Anhui 241000,China)

机构地区：[1]安徽机电职业技术学院机械工程系,安徽芜湖241000 [2]安徽金鼎锅炉股份有限公司焊接实验室,安徽芜湖241000

出　　处：《佳木斯大学学报（自然科学版）》2019年第4期601-605,共5页Journal of Jiamusi University：Natural Science Edition

基　　金：2016年安徽省高校优秀青年人才支持计划重点项目(gxyqzd2016478)

摘　　要：为了解决9Ni低温钢用于LNG(液化天然气)储罐的焊接工艺问题,利用手工电弧焊方法进行焊接试验,分别选用三种不同成分焊条(两种Ni基,一种Fe-Ni基)焊接,针对三种不同焊材下焊接接头进行拉伸、低温冲击与弯曲试验,得到三组力学性能试验结果,进行比较并分析,再针对三种不同焊材下的焊接接头进行金相分析,得到不同焊材下焊接接头的金相组织照片。最终分析得出ENiCrMo-6焊条焊接9Ni钢能够获得最好的低温韧性,同时配合较小的焊接线能量下进行多层多道焊接有利于降低焊接接头的脆性,可以从根本上改善LNG储罐低温下的韧性。In order to solve the problem of welding process of 9Ni low temperature steel used in LNG (liquefied natural gas) storage tank .Using SMAW to welding test. Three different composition electrodes (two Ni-based, one Fe-Ni-based) were selected for welding. Tensile, low temperature impact and bending tests for welded joints under three different welding consumables. Three sets of mechanical properties test results were obtained. Compare and analyze. Metallographic analysis of welded joints under three different welding consumables. Photograph of metallographic structure of welded joints under different welding consumables. The final analysis shows that ENiCrMo-6 welding rod welding 9Ni steel can obtain the best low temperature toughness. At the same time, multi-layer multi-pass welding with small welding line energy is beneficial to reduce the brittleness of welded joints. It can fundamentally improve the toughness of LNG storage tanks at low temperatures.

关 键 词：9Ni低温钢 LNG 焊条 焊接接头 ENiCrMo-6 低温韧性 

分 类 号：TG457.11[金属学及工艺—焊接]