Spiral piling pipe is low carbon steel or low alloy steel strip at a certain angle rolled into a spiral tube, and then welded together to form the tube, which can be produced with a narrow strip of large diameter pipe. Spiral single-sided and double-sided welding welding, pipe should ensure that hydrostatic test, weld tensile strength and cold performance to meet the requirements. In welding and soldering are used Lincoln welding machine for single or double wire submerged arc welding, thereby obtaining a stable welding specifications. After welding the weld line continuous ultrasonic injury checks to ensure 100% coverage of non-destructive testing of welds spiral. If defective, automatic alarm and spraying tags, production workers so adjusting the process parameters, and remove defects.
Heating operation is the second key is to try to cut the number of oxide. Especially in hot kneading elbow, something life expectancy from the pipe surface quality and kneading leave, pleading even more severe. Such as heat with the stove, according to their effect, divided into two kinds of furnaces and reheating; former for the fabric is heated from room temperature to the processing temperature; which is used during the processing of billets reheated to the required processing temperature. There are many ways the furnace, but the primary use of the annular furnace. This has an annular hearth furnace, which can slowly shift along the bottom of the blank from the entrance into the radial direction, reverse one can be used at the outlet of the heating and soaking temperature to the rules one kind of stove. This heating operation is the key to uniformly heat the billet to a temperature suitable for processing. Since a great impact on the quality piercing, that is, perforation processing temperatures are important condition affecting the quality, it is generally to processing of piercing the billet temperature control.
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