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Large dia. spiral seam welded steel pipe - where both internal and external welds use tandem electrodes for MIG pre-welding, followed by submerged arc
Large dia. spiral seam welded steel pipe - where both internal and external welds use tandem electrodes for MIG pre-welding, followed by submerged arc
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机译：大直径螺旋焊缝钢管-内部和外部焊缝均使用串联电极进行MIG预焊，然后进行埋弧焊
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摘要
Steel strip is wound into a horizontal spiral; and both the inner surfaces and the external surfaces of the butt joint between the edges of the strip are welded using at least two consumable electrodes in tandem. Both on the inner joint and the outer surfaces, the front electrode is employed for MIG prewelding, whereas the second electrode and any more electrodes are used for submerged arc welding. The electrodes are wire or rod 3-8 mm dia., used with welding current 600-2000 A, and welding voltage 20-50 V. The prewelding uses inert gas at 70-400 l/min contg. by vol. 20-50% Co2 and/or 3-10% O2; and the submerged arc welding is undertaken at one or more 360 degrees turns of the spiral pipe behind the front, MIG electrode. Used in high speed mfr. of spiral welded pipe without welding defects.
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机译：钢带缠绕成水平螺旋形;条带边缘之间的对接接头的内表面和外表面均使用至少两个可串联的消耗电极焊接。在内部接头和外表面上，前电极均用于MIG预焊，而第二电极和其他电极则用于埋弧焊。电极为直径3-8 mm的线或棒，焊接电流为600-2000 A，焊接电压为20-50V。预焊接使用的惰性气体浓度为70-400 l / min（续）。按体积20-50％的CO2和/或3-10％的O2;埋弧焊是在前MIG电极后面的螺旋管旋转360度或一圈以上时进行的。用于高速制造。没有焊接缺陷的螺旋焊管。
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