Identification method of spiral pipe thread
The spiral steel tube method for identifying the most effective is the use of joint rule, this rule is a specific marker of the vernier caliper diameter of external thread root diameter and inner screw thread hole expansion, easy to use, intuitive, accurate. In addition, you can also use the long foot vernier caliper with steel ruler measurement of external thread root diameter, length, cone aperture thread control thread specification query. Because of the defect and the weld are parallel, so the spiral steel pipe, weld defect which is oblique defects. In the process of using, the principal stress direction of steel pipe, namely equivalent defect length of the steel tube axis direction is smaller than the straight pipe; secondly, because of pipeline steel are rolled steel, the impact toughness have larger anisotropy along the rolling direction, the CVN value can be 3 times higher than the vertical to the rolling direction CVN. The principal stress is perpendicular to the direction of minimum tube shock resistance ability of the straight pipe, spiral steel pipe and is staggered impact resistance ability lowest direction, the weakness of spiral steel pipe weld length into advantage.
Spiral pipe weld seam length ratio, such as the length of L, the weld length of L/cos. Long debated the spiral steel pipe and pipe joints, especially compared with UOE steel who better problem. Spiral steel pipe manufacturing technology development to today, we should correctly assess and comprehensively, to understand long spiral steel pipe, weld the problem. As the spiral steel pipe outer diameter of the tube is represented by the letter D, followed by additional external diameter size and wall thickness, such as diameter of seamless steel tube 108, a wall thickness of 5MM, denoted by D108*5, is also used outside said, such as De63 plastic pipe, such as reinforced concrete pipe, cast iron pipe, galvanized pipe, use DN says, in the design drawings to represent general with nominal diameter, nominal diameter to a standard design and manufacture and repair convenience artificially, than the nominal diameter, tube (or pipe) specification name.
(editor
：admin)
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