摘要
根据连续管结构特点开发了专用工装及优化的焊接工艺,并对焊接接头的强度、塑性、硬度、耐腐蚀性能进行了研究。结果表明,连续管对接接头的热影响区中总存在不同程度的软化,该软化区的存在使得接头断裂于焊缝附近,同时接头的强度降低。采用专门开发的水冷焊接工艺可以明显改善软化程度,接头强度下降幅度降低。接头的弯曲、压扁试验结果表明焊接接头具有良好的变形能力。在28%HCl模拟溶液中焊接接头的腐蚀速度很快,由于材质的不同及结构特点的影响,焊缝的腐蚀速度明显高于母材及热影响区。
According to structure characteristics of CT, the special welding fixture and optimized welding process were developed, and the properties of welded joint, such as strength, plasticity, hardness and corrosion resistance were researched. The results indicated that different degree softening always exist in HAZ of CT butt welded joints, the softening area make welded joint fracture appear nearby weld, and strength drop down. Adopting specially developed water cooling welding process can improve softening degree obviously, and decreasing range of welded joint strength is reduced. Welded joint bend and the flattening test results showed that welded joint is with perfect deformability. The corrosion rate of welded joint is very quick in 28%HCl simulated solution. The corrosion rate of weld is higher than that of base metal and HAZ according to different material and characteristics.
出处
《焊管》
2012年第5期15-18,共4页
Welded Pipe and Tube
关键词
连续管
对接焊
力学性能
腐蚀
coiled tubing （CT）
butt welding
mechanical property
corrosion
