The strength of the spiral steel pipe is generally higher than the straight seam welded pipe and straight seam welded pipe development too fast, the cost is low, two kinds of steel pipes have advantages also is different, so the applicable scope is also different.
The two edges of the heating tube to the welding temperature in the extrusion press roll, a common mutual penetration of the metal grains, crystals, and ultimately form a strong weld. If the pressing force is too small, a common number of crystals is small, the weld metal strength decreases, the force will produce cracks; if the extrusion pressure is excessive, the molten weld metal is extruded, not only reduces the the weld strength, and will generate a lot of internal and external burrs, and even cause defects such as seam welding ride.
Spiral Pipe uses: spiral steel pipe is mainly used in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction, is the development of 20 key products. For the transport of liquids: water supply and drainage. For gas transportation: gas, steam, liquefied petroleum gas. For structural purposes: as piling pipe for bridges; docks, roads, buildings and other structures tube.
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