激光-电弧复合焊技术在长输管道焊接中的研究进展

重点介绍了国内外管道激光焊接技术的发展，对不同类型激光器的激光-电弧复合焊技术在油气长输管道焊接上的研究进展和应用进行了详细回顾。结果表明，CO2激光器和闪光灯触发的Nd:YAG激光器由于传输方式和效能的不利因素，不适于油气管线长途作业，而高能Yb光纤激光技术推进了激光-电弧复合焊接技术在管道焊接现场应用的步伐；同时，对目前该技术在应用中存在的问题进行了总结分析；最后对激光-电弧复合焊技术在管道焊接上的应用前景进行了展望。激光-电弧复合焊技术已在试验室条件下成功焊接了管径1 219 mm、钝边高度8 mm的X80钢管，焊缝外观和焊缝力学性能均能满足长输管道焊缝合格标准要求，但后续为适用长输管道现场焊接，还需进行焊接工艺现场适应性试验。 创新点： 针对激光-电弧复合焊技术应用于管道焊接存在的共性问题进行分析总结，提出激光-电弧复合焊在现场应用的具体解决措施，为后续激光-电弧复合焊最终在现场应用提供可行的解决方案。

Research progress of laser-arc hybrid welding technology in long distance pipeline welding

The development of laser welding technology for pipeline at home and abroad was emphatically introduced. Application of laser-arc hybrid welding technology with different types of lasers in long oil and gas pipeline was reviewed in detail. The results showed that CO2 lasers and lamp pumped Nd: YAG lasers were not suitable for long-distance oil and gas pipelines due to disadvantages of transmission mode and efficiency, while high-energy Yb fiber laser technology promoted application of laser-arc hybrid welding technology in pipeline welding on site. Meanwhile, the problems existing in application of the technology at present were summarized and analyzed. Finally, application prospect of laser-arc hybrid welding technology in pipeline welding was prospected. Laser-arc hybrid welding technology was applied to X80 steel pipelines with 1 219 mm pipe diameter and 8 mm root face thickness under laboratory conditions. Appearance and mechanical properties of weld could satisfy requirements of long-distance pipeline weld criteria. However, in order to be suitable for long-distance pipeline welding on site, adaptability tests of welding process on site were required. Highlights: The common problems existing in the application of laser-arc hybrid welding in pipeline welding were analyzed and summarized, and specific solutions for the application of laser-arc hybrid welding in the field were proposed, which provided feasible solutions for the final application of laser-arc hybrid welding in the field.