摘要
针对海上钻井平台桩腿用厚板低合金高强钢Q690E,采用高效机器人双丝MAG焊接系统,通过温度场数值模拟以及焊缝区微观组织观察分析,对不同双丝间距条件下的Q690E高强钢机器人双丝MAG焊焊缝区低温韧性进行研究。结果表明:当双丝间距为15mm时,焊缝区组织以先共析铁素体和针状铁素体为主,低温韧性最好。
Aimed at high strength low alloy steel Q690E thick plate of offshore drilling platform, adopting efficient tandem arc MAG welding robot system, the low temperature toughness of weld zone in different distance between welding wires of high strength steel Q690E has been studied through the numerical simulation of temperature field and microstruc- ture observation analysis. The results show that when the wire spacing is 15 mm, the micro structure of the weld is based on primary ferrite and aeieular ferrite, the low temperature toughness is best.
关键词
双丝MAG焊
低温韧性
双丝间距
Q690E高强钢
Tandem arc MAG welding Low-temperature toughness Distance between wires Q690E high strength steel
