单枪自动焊在管道连头口应用中的改进研究

单枪自动焊在管道连头口应用中的改进研究 Upgrading and research of single-torch automatic welding system in long-distance pipeline tie-in 刘晓文 LIU Xiaowen 1 first-author 牛连山 NIU Lianshan 1 梁明明 LIANG Mingming 1 李阳 LI Yang 1 中国石油天然气管道科学研究院有限公司 中国石油天然气管道科学研究院有限公司 China Petroleum Pipeline Research Institute Co.,Ltd. China Petroleum Pipeline Research Institute Co.,Ltd. 利用内焊机根焊+实心焊丝气保下向自动焊进行长输管道焊接施工具有过程易于控制、焊接效率高、质量稳定的优势。然而,由于组对和坡口因素,原有的自动焊技术在管道连头施工中难以应用。连头口具有宽窄不一、错边量大的特点,为实现管道连头的自动化焊接,以CPP900-W1单焊炬管道自动焊系统为基础,采用药芯焊丝气保护焊工艺,通过试验对装备功能及工艺参数进行优化,在坡口组对错边量3 mm,平焊位置和仰焊位置组对间隙相差2 mm(平焊位置组对间隙2.5 mm,仰焊位置组对间隙4.5 mm),得到能够满足连头口自动焊要求的焊接装备和焊接工艺参数,焊缝无损检测结果及力学性能均满足相关标准的要求。该设备和工艺现已在中俄东线现场得到应用且效果良好,大幅降低了焊工劳动强度,同时提高了焊接效率。 Using internal welding machine for root welding+ automatic solid wire gas shielded vertical down welding for long-distance pipeline welding construction has the advantages of easy process control, high welding efficiency and stabile welding quality. However, due to factors of pairing and beveling,it’s difficult to apply current automatic welding technology in the construction of pipeline tie-in. In order to realize the automatic welding of pipeline tie-in with irregular width and large offset, on the basis of automatic CPP900-W1 single welding torch pipeline welding system, by adopting flux-cored wire gas shielded welding process, the equipment function and welding parameters are optimize through experiments. With the groove pairing offset of 3 mm and pairing gap of 2 mm between the flat position and overhead position welding, the welding equipment and parameters meeting the requirements of automatic welding of tie-in are obtained. Non-destructive testing result and mechanical properties of welds meet the requirements of relevant standards. This welding equipment and process have been applied on the site of East China-Russia gas pipeline and is proved of good application effect. Welder labor intensity is greatly reduced and welding efficiency is highly improved. 油气管道 自动焊 单焊炬 焊接效率 oil and gas pipeline automatic welding single welding torch welding efficiency TE973.3 2022-03-08 11 51