海洋平台用特厚板大线能量焊接接头力学性能研究  

Research on mechanical properties of higher heat input welded joints for super thick marine platform steels

作　　者：李丽[1] 陈亚魁 吴君明 蔡焕 田浩 王红鸿[2] LI Li;CHEN Yakui;WU Junming;CAI Huan;TIAN Hao;WANG Honghong(Institute of Nanjing Iron and Steel Group Co.,Ltd.,Nanjing 210000,China;Wuhan University of Science and Technology,Wuhan 430000,China)

机构地区：[1]南京钢铁集团有限公司研究院,江苏南京210000 [2]武汉科技大学,湖北武汉430000

出　　处：《电焊机》2018年第11期27-30,35,共5页Electric Welding Machine

摘　　要：为了研究适用于特厚板大线能量焊接的工艺参数,对E36W 50、80 mm厚板分别进行双丝、三丝、四丝埋弧焊试验。对焊后的接头进行拉伸试验和冲击试验。结果表明,多丝埋弧焊焊接接头的力学性能能够满足海洋工程用钢要求。多丝埋弧焊焊接接头冲击性能较差的部位在焊缝,随着焊接丝数的增加,焊缝组织中先共析铁素体含量增加、晶粒尺寸增大,冲击性能降低。在焊接工艺相同的情况下,80 mm厚板焊缝中先共析铁素体含量更多,晶粒尺寸更大,相对于50 mm板厚的焊缝金属,冲击韧性降低。In order to study welding technology with higher heat input for super thick plates,the double-wire,three-wire and fourwire submerged arc welding experiments were carried out for steel plates of E36W with thickness of 50 mm and 80 mm.The welded joints were tested by tensile and impact test.The experimental result shows that the mechanical properties of the joint after multi-wire submerged arc welding meet the requirements of marine engineering steels.The relative low impact toughness was exhibited in the weld metal.As the number of wires increases,the content of pre-eutectoid ferrite in the weld increases,and the grain size increases,which resulting in the decreasing of impact toughness.In the same welding process,the content of pre-eutectoid ferrite in 80 mm thick plate welds is more,and the grain size is larger,which resulting in the impact toughness decreasing.

关 键 词：大线能量焊接 多丝埋弧焊 力学性能 针状铁素体 晶粒尺寸 

分 类 号：TG407[金属学及工艺—焊接]