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在陕京输气管道工程施工中,我公司首次采用纤维素焊条、低氢型焊条的向下焊技术,通过培训不断摸索出一套成熟的向下焊操作工艺。为有效地控制焊缝内在质量要求,从管口准备、组对到焊接各工序按以下方法作业。 1 焊前准备 现场修磨管口,使其钝边为1.4～1.6mm,坡口角度为60°±5°。在原有管螺旋焊缝内表面靠近坡口端100mm范围内用动力砂轮磨平,在外表面靠近坡口端用动力砂轮修磨出长约有15mm的缓坡。管内外表面坡口两侧各25mm范围内应用角向磨光机清理至露出金属光泽。坡口内侧不得有内坡口。 钢管组对后错边量应小于1.2mm,若允许,应尽量
In the Shaanxi-Beijing Gas Pipeline Project, our company adopts the down-welding technology of cellulose electrode and low-hydrogen electrode for the first time. Through training, we continuously explore a set of mature down-welding operation technology. In order to effectively control the internal quality requirements of the weld, from the nozzle preparation, the group to the welding process according to the following methods. 1 Prepare the welding site before welding to make the blunt edge 1.4 ~ 1.6mm, the bevel angle is 60 ° ± 5 °. In the original pipe spiral weld seam surface near the end of the groove 100mm range with power grinding wheel polished near the end of the outer surface of the grinding wheel with a power grinding about 15mm gentle slope. The inner and outer surfaces of the bevel on both sides of the 25mm range of application of angle grinder to clear the metal luster. Groove inside the groove may not have. Steel pipe after the wrong side of the amount should be less than 1.2mm, if allowed, should be as far as possible