Common spiral steel pipe standards are generally divided into: SY / T5037-2008 (Ministry of standard, also known as ordinary fluid pipes with spiral submerged arc welded pipe), GB / T9711.1-2008 (GB, also known as the oil and gas industries – Steel pipe technical delivery conditions for the first part: a grade steel (demanding a GB / T9711.2 B grade steel)), API-5L (American petroleum Institute, also known as line pipe; which is divided into PSL1 and PSL2 two levels), SY / T5040-2008 (pile with spiral welded steel pipe).
SY / T5037-2008 standard petroleum portion disposed generally referred to as the Ministry of standard
General low pressure liquid delivery spiral seam high frequency welded steel pipe (SY5039-2000) is a hot-rolled steel strip coils for the tube, often warm spiral shape, using high frequency lap welding method for general low pressure liquid delivery spiral seam high frequency welded steel pipe.
Pile with spiral welded steel pipe (SY5040-2000) is a hot-rolled steel strip coils for the tube, often warm spiral shape, using double-sided submerged arc welding or high frequency welding, used in civil engineering structures, piers, bridges and other infrastructure pile with steel pipe.
Principle Spiral Pipe SAW: Submerged arc welding is performed by arc welding of heat energy, and manual arc welding is different: submerged arc welding wire is bare, no paint above, submerged arc flux is to be laid in advance welding Department, submerged arc welding wire extends into the flux, the arc is burning in flux. Wire contact with the workpiece, press the start button is pressed after a moment, the wire and the workpiece is energized, the wire Withdrawing arc ignited at the welding carriage forward, continuous wire to transport, maintain the arc burns at the solder layer, below the arc forming a weld pool. Arc around the solder melts to form a cavity, the cavity and the pool continues to advance, and the pool behind the metal solidifies to form a continuous weld. Because this process is carried out in a flux, so we can not see with the naked eye. By means of X-ray photography can be seen.
Since spiral submerged arc welding steel pipe welding technology, so high production efficiency; produce less auxiliary time, saving time change electrode; welding conditions clean and free of spatter, saves clean-up time; high weld quality. Spiral Pipe factory for delivery to provide the necessary conditions so that large spiral pipe production time is guaranteed, so it is widely used.