Straight seam pipe generally high-frequency welding, high frequency welding is a kind of induction welding (or pressure contact welding), it does not need to weld filler, weld spatter, welding heat affected zone is narrow, beautiful welding molding, welding, the advantages of good mechanical performance, so in the production of steel by wide application. According to the principle of electromagnetic induction and the exchange charge in the conductor tends to skin effect and proximity effect and eddy current heat effect, the edge weld steel local heating to a molten state, through the roller extrusion, the butt weld the intergranular bonding, so as to achieve the purpose of seam welding, cooling after the formation of a strong straight seam welding.
Classification by application
Roller tube: for the belt conveyor roller welding Steel Pipe, generally with Q215, Q235A, B steel and 20 steel manufacturing, diameter 63.5-219.0mm. On the Tube Bending, end face to be vertical, and the center line of ovality has certain requirements, the general pressure and flattening test. Transformer for manufacturing of transformer radiator tube and other heat exchangers, made of ordinary carbon steel, flattening, expanding export, bending, the hydraulic test tube. Steel pipe to be fixed or double the length of delivery, the bending of the steel pipe has a certain degree of requirements.
Shaped tube: by ordinary carbon node structure steel and 16Mn steel welded square tube, rectangular tube, tube cap, empty plastic steel windows and doors with steel pipe, mainly used as agricultural machinery parts, steel window and door etc..
Welded thin-walled tube: mainly used to make furniture, toys, lamps, etc.. In recent years, with the production of stainless steel tube is widely used, furniture, decoration, fences etc..
Spiral welded pipe: is low carbon structural carbon steel or low alloy steel strip steel and according to the certain helix angle (called forming angle) rolled into a tube, then the tube seam welded together made, it can narrow strip steel production of large diameter steel pipes. Spiral welded pipe is mainly used for oil and natural gas transmission pipeline, the specification of outer diameter * wall thickness. Spiral welded pipe has one side welding and double side welding, welded pipe should ensure that the hydraulic pressure test, the tensile strength of the welded joint and the cold bending properties should be consistent with the provisions.
Advantages of UniSite
1. No customer quality complaints for 10years
We have a perfect managing system and quality control system which from initial work, to process control, to final control, forming the whole process traceability with a good command of quality and production schedule.
You can see the quality of all our previous orders were guaranteed based on our good procedure and service.
2. Born from military factory, with rigorous team having rich experience of military marine products
We UniSite started as a small contractor of ship building works in military factory in Ningbo 10 years ago. After several years of accumulation, the team had owned a certain number of experienced managers, engineers, technicians and workers who have rich experience in military shipping building and have good marine practice.
3. Involved in many big projects all over the world
We have involved in many projects all over the world that we have ability to participate in big projects.
4. BV/CCS approval for manufacturer capability qualification
We passed the BV/CCS approval for manufacturer capability qualification for dredging & Dredger products.
Photos of our Steel round Longitudinal Welded Pipe
Our service
Besides above the general specifications, we can also supply some specific pipes and other similar steel structure as clients' requirements.
Package and shipping
bulk package and bulk vessel transportation
frame container package and frame container transportation
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Product Categories : Steel Pipe > Longitudinal Pipe
