As a result, a small diameter welded pipe are mostly with straight seam welding, large diameter welded pipe for the most part adopts spiral welded. Welding temperature is mainly by regulating the high frequency eddy current to control thermal power and welding speed.Wire casing: are ordinary carbon steel welded steel pipe, used in concrete and various power distribution project, common nominal diameter from 13-76 - mm. Wire set set wall is thinner, mostly for coating or galvanized after use, requirements for cold bending test. For corrosion protection, some aluminized processing. With 8, 10, 15, 20, or Q195 - made of Q235 steel strip. Steel tube to length or delivery times ruler, steel tube bending has certain requirements.Transformer tube: used in the manufacture of transformer radiator pipe and other heat exchanger, using common carbon steel manufacturing, requirement of flattening, flaring, bending, hydraulic test. Use Q195A, Q215A, Q235A steel manufacturing.
Roller tube: used in belt conveyor roller welded steel pipe, Q215, Q235A, B is commonly used in steel and 20 steel manufacture, 63.General welded pipe: general welding work for low pressure liquid.Special pipe: by ordinary carbon structural steel and 16 mn steel guitar with welded square tube, rectangular pipe, caps, empty plastic steel doors and Windows with steel tube, mainly used for agricultural machinery parts, steel window, door, etc.Metric welded pipe, the form of specifications with a seamless tube, expressed in mm outside diameter * wall thickness of welded steel pipe, can use ordinary carbon steel, quality carbon steel or low alloy steel in the tropics, cold welding, or with tropical again after the cold welding method is made.According to the application is divided into general welded pipe, galvanized welded pipe, oxygen blowing metric welded pipe, welded pipe, wire casing, roller tube, deep well pump pipe, auto tube, transformer, electric welding thin wall pipe, welded pipe and spiral welded pipe.
According to the principle of electromagnetic induction and ac charge in the conductor skin effect and proximity effect and eddy current heating effect, make the edge of the weld steel locally heated to a molten state, the squeezing roller, to realize the joint between the crystal butt weld, so as to achieve the purpose of the welding OEM Corrugated Hoses Factory seam, cooled to form a solid straight seam weld. The welding temperatureLow carbon steel material, welding temperature control in 1250 ~ 1460 , the wall thickness 3 ~ 5 mm penetration can meet the requirements. In nominal diameter straight seam pipe specifications, according to the wall thickness can be divided into thin-walled straight seam pipe and thick wall tube two straight. The weldingStraight seam pipe generally adopt high-frequency welding, high frequency welding is a kind of induction (or contact pressure welding) welding, it need to weld filler, no welding spatter, narrow welding heat affected zone, weld moulding beauty, weld the advantages of good mechanical performance, thus is widely used in steel production.Welded steel pipe refers to the steel belt or steel plate bending deformation shapes such as round, square before welding, jointed on the surface of steel pipe. The weld gapWill strip into welded pipe unit, the multichannel roll rolling, strip steel rolled up gradually, there is an open space form of round billet, adjust the quantity of the squeezing roller, make the weld gap control in 1 ~ 3 mm, and the joint match on both ends