螺旋焊管板头对接FCB法单面焊双面成形工艺研究

Research on FCB Method Single-side Welding and Double Faced Forming Process for SAWH Pipe Plate Butt

为了实现螺旋焊管生产用钢带对接焊缝的单面焊双面成形,对埋弧焊FCB法单面焊双面成形工艺进行了试验研究。首先在试验室完成了壁厚16 mm、20 mm和22.5 mm焊接试板的FCB法单面焊双面成形工艺试验,优化了FCB工艺的焊接参数。在此基础上,完成了螺旋焊管生产线板头对接双丝焊改造,在线进行了18 mm、22 mm两种壁厚板头对接单面焊双面成形试验,基本实现了螺旋焊管卷板头尾对接工序的单面焊双面成形工艺的应用。试验及生产线应用表明,FCB法单面焊双面成型焊接接头各区域基本性能满足技术指标要求,该项工艺可以推广应用于输水管线、结构管等承压能力和钢级较低的螺旋管的板头对接缝焊接,可以提高焊接生产效率,降低生产成本。

In order to realize single-side welding and double faced forming process of SAWH pipe steel strip butt weld,this process method was researched. The FCB method single-side welding and double faced forming process tests were accomplished on 16 mm,20 mm and 22.5 mm thickness test pieces in the lab,and welding parameters of the FCB method were optimized. On this basis, the dual-wire welding renovation at the butt-jointing post of the SAWH pipe production line was completed,and the single-side welding and double faced forming test on 18 mm and 22 mm thickness butt joints was experimented on the production line. The application of single-side welding and double faced forming process on the coil-end butt joint of SAW pipe was basically realized. According to the tests and production applications,basic properties of welded joint with single-side welding and double faced forming process in FCB method could meet the technical requirements basically. This process could be popularized to the coil-end butt joint of lower pressure bearing capacity low-grade steel which could improve welding efficiency and reduce costs of production.