预精焊机组多丝内焊起弧稳定性问题的研究

简述了螺旋缝焊管预精焊机组的内焊结构;介绍了数字化焊接系统的内焊一键式起弧过程及原理;分析了埋弧焊电弧自我调节过程及影响内焊起弧稳定性的因素,总结出提高起弧稳定性的措施.实践证明：通过优化数字电焊机参数,调整最大送丝速度,结合实践操作经验,使内焊起弧稳定性得到大幅度提升,提高了螺旋缝焊管的质量.

Research on Problem Concerning Instability of Arcing during Multi-wire Internally-welding Process of Two-step Pipe Welding Mill

Briefly described here in the essay is the structure of the internally-welding unit of the SAWH pipe two-step （pre-welding and finish welding） operation line. And elaborated are the one-key type arcing process and principle of the internally-welding function of the digital welding system. Also analyzed are the SAW arc self- adjustment process, and elements that may affect arcing stability of internally-welding operation, based on which, measures aiming at improving the arcing stability are decermined, and taken. Relevant practice shows that the arcing stability of the internally-welding process is obviously improved, and so is quality of the SAWH pipe due to implementing such measures as optimizing parameters of the digital welder, setting the maximum wire-feeding speed, and taking the actual operation experience into consideration, etc.