松花江斜拉大桥Q420E钢对接接头埋弧焊焊接工艺  

SAW PROCEDURES OF Q420E BUTT JOINT FOR SONGHUA RIVER STAYED-CABLE BRIDGE

作　　者：张显辉[1] 孙维峰[1] 张静[1] 刘绍云 李志波 葛忠权 陈彦君[3] 赵喜强[3] 常明华[3] 

机构地区：[1]机械科学研究院哈尔滨焊接研究所,150080 [2]哈尔滨绕城高速公路工程建设指挥部,150070 [3]龙建路桥股份有限公司,150070

出　　处：《焊接》2003年第11期21-24,共4页Welding & Joining

摘　　要：对松花江斜拉大桥钢梁用Q42 0E厚板对接接头的埋弧焊焊接工艺进行了研究。通过对不同焊接工艺条件下焊接接头的组织性能分析 ,发现Q42 0E钢板焊接接头低温冲击韧性对焊接热输入量较敏感。在较大焊接热输入条件下焊接 ,焊缝金属产生粗大先共析铁素体、过热区产生粗大粒状贝氏体 ,焊接接头低温冲击韧性因此降低。为使焊接接头各部位 -4 0℃夏比冲击韧性满足桥梁设计要求 。In this paper the Submerged Arc Welding procedures for Q420E butt joint of Songhua River Stayed-cable Bridge were investigated. The microstructure and mechanical properties of welded joints with different welding procedures were analyzed. It was discovered that the low temperature toughness of Q420E welded joint was sensitive to welding heat input. The coarse primary ferrite appeared in weld metal, and coarse bainite appeared in heat-affected zone under larger heat input welding condition, which caused low temperature toughness lower. In order to make the welded joint charpy impact toughness at -40℃ to meet the technical requirement of the bridge, the welding heat input should be controlled strictly.

关 键 词：斜拉桥 Q420E钢 对接接头 埋弧焊 焊接工艺 低温韧性 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] TG445[交通运输工程—道路与铁道工程]