管道环焊缝多焊炬自动内焊机关键技术分析

Analysis on key technologies for pipeline internal circumferential automatic welding machine with multi-torch

管道环焊缝自动内焊机主要用于管道环焊缝焊接施工中的管口组对和根焊焊接,相比其它的根焊设备和技术,内焊机完成根焊质量可靠,效率最高.重点研究了长输管道环焊缝多焊炬自动内焊机的总体设计、数字式控制系统、细丝焊接电弧的控制及环焊缝自动内焊工艺等关键技术.现场实际应用表明,研究出的环缝多焊炬自动内焊机结构合理、控制先进,完成一个环焊接头根焊用时仅90s.其可靠性和野外环境适应性完全满足现场焊接施工要求.

The pipeline internal circumferential automatic welding machine (PIW machine) has been mainly used for pipe alignment and welding root pass in course of pipeline construction. Compared with the other root pass equipment and technologies,PIW machine has the higher efficiency and better root quality. This paper researches the key technologies such as the entire design of PIW machine with multi-torches,digital control system,arc-control for small size wire and the internal welding process. The site application indicates PIW machine with multi-torches has the advantages of reasonable structure and advanced control system,its welding speed is 90s per joint. Its reliability and the filed adaptability to environment meet the site welding construction request completely.