摘要
基于有限元模拟开发的管道环焊缝敏感性试验方法,对X65管线钢带铜衬垫焊接工艺裂纹敏感性进行了研究,通过对带铜衬垫和不带铜衬垫两种试验方案的结果进行对比分析,验证了制定的铜衬垫现场焊接工艺的合理性。该工艺冷裂敏感性较低的原因:(1)制定的焊接工艺参数合理,热输入量不大,仅为0.56 k J/mm,现场实际焊接中的热输入量更小,铜元素很难渗透到焊缝中;(2)采用ER70S-G实心焊丝CO2气体保护焊进行X65钢焊接,其抗冷裂性能良好。进行了根部局部腐蚀试验检测,结果表明:通过制定合理的焊接工艺参数,X65带铜衬垫根焊工艺的焊接接头力学性能可以满足工程施工规范的要求。
In this paper, crack sensitivity analysis was performed on the root welding process with copper liners in X65 pipeline by the pipeline girth weld sensitivity test method which is developed on the basis of finite element simulation. The welding process with copper liners was proved to be reasonable by comparing its test results with that of the process without copper liners. The lower cold crack sensitivity is mainly caused by the following two reasons. First, the designed welding parameters are rational with heat input as low as 0.56 kJ/mm and the heat input is less during the on-site welding, so it is difficult for the coppers to penetrate into the welding lines. And second, its cold cracking resistance is good when X65 steel is welded by CO2 gas shielded welding process with ER70S-G solid wires. Besides, local corrosion test was performed at the roots. It is shown that X65 root welding with copper liners can fully meet construction specifications in terms of welded-joint mechanical properties by formulating welding parameters reasoriably. （3 Figures, 4 Tables, 12 References）
出处
《油气储运》
CAS
北大核心
2016年第8期819-822,共4页
Oil & Gas Storage and Transportation
基金
中国石油天然气管道局科技攻关项目"海底管道铺管船法全自动焊接技术研究与应用"
2013-04-02
关键词
根焊
铜衬垫
裂纹敏感性
里海裂纹试验
热输入
root welding, copper liners, crack sensitivity, Lehigh restraint cracking test, heat input
