交流方波参数对9Ni钢埋弧焊焊缝成形和接头组织的影响  

Effects of AC Square Wave Parameters on Weld Formation and Joint Microstructure in 9% Nickel Steel SAW

作　　者：康凌风 石少坚 王欢 蔡艳[1] 华学明[1] 

机构地区：[1]上海交通大学上海市激光制造与材料改性重点试验室,上海200240 [2]沪东中华造船(集团)有限公司,上海200129

出　　处：《热加工工艺》2016年第15期32-36,40,共6页Hot Working Technology

基　　金：上海市科委资助项目(14DE1200400)

摘　　要：通过对比试验方法研究了交流方波波形参数(平衡和偏置)对9Ni钢埋弧焊焊缝成形和组织形态的影响。结果表明,平衡和偏置对焊缝成形和熔敷效率具有显著影响,采用较低的平衡值(<50%)和负偏置值有利于提高母材在焊缝金属中的熔合比,提高Ni、Cr、Mo等元素在焊缝中心的比例,并细化焊缝中心奥氏体枝晶。然而,对于9Ni钢埋弧焊接头热影响区的组织形态而言,交流方波波形的影响十分微弱。A series of comparative experiments were performed to observe the effects of AC square waveform parameters （balance and offset） on weld formation and joint microstructure in 9% nickel steel submerged arc welding. The results indicate that balance and offset have a significant impact on weld formation, penetration and deposition rate. The use of lower balance （〈50%） and negative offset will increase the fusion ratio of the base material in the weld metal, which leads to a raise in the content ofNi, Cr, Mo in the weld metal and a refinement of austenite dendrites. However, AC square waveform （both balance and offset） has little influence on the microstructure of heat affected zone in 9% nickel steel submerged arc welding.

关 键 词：9Ni钢埋弧焊 交流方波 熔合比 焊缝成形 组织形态 

分 类 号：TG445[金属学及工艺—焊接]