SSAW Pipe

    LSAW steel pipe is the strip into the pipe unit, the multi-roll rolling, strip gradually rolled up to form a circular gap open billet, adjust the squeeze roll reduction, so that weld gap control In the 1 ~ 3mm, and make both ends of the welding flush. If the gap is too large, it will reduce the proximity effect, eddy current heat shortage, weld intergranular bonding caused by poor fusion or cracking. Such as between     If the gap is too small, the proximity effect will be increased, the welding heat will be too large, and the weld will be burned; or the weld will be crushed and crushed to form the pit, which will affect the weld surface quality.     Welding process example:     Weld φ32 × 2mm longitudinal welded pipe, for example, briefly describes the process parameters:     Strip specifications: 2 × 98mm bandwidth by medium diameter expansion plus a small amount of molding margin.     Steel material: Q235A ...

    In the manufacturing of lsaw steel pipe , the lsaw steel pipe manufacturers need to have very good control of the extrusion force.This is reason why in the welding process, the two tube embryo edge temperature reaches the welding temperature, The pressure can make their mutual penetration of metal grains, resulting in a combination of close crystallization, to achieve the purpose of welding firmly.But if the squeeze in the lack of crystallization is not well formed, the strength of the welding position will very low, in the course of the process is very easy to crack because of the role of external problems.But when the extrusion is too large to reach the welding temperature of the weld metal will be squeezed out of the weld location, the real welding together can be get the temperature and the metal will be very small, so the number of crystals will be reduced, it will also lead to welding is not strong enough, but also have a lot of burr, so it is more serious to the def...

    Carbon steel pipe use:     1. Machinery industry tube. Such as aviation structural tube (round tube, oval tube, flat oval tube), automotive axle tube, axle tube, automobile tractor tube, tractor oil cooler tube, agricultural square tube and rectangular tube, transformer tube and bearing tube and so on.     2. Petroleum geological drilling tube. Such as: oil drilling pipe, oil drill pipe (square drill pipe and hexagonal drill pipe), petroleum tubing, casing and various oil pipe fittings, geological drilling pipe (core pipe, casing, active drill pipe, by hoop and pin connector, etc.).     3. Pipeline pipe. Such as: water, gas pipes, steam pipes with seamless pipe, oil pipelines, oil and gas trunk pipe. Agricultural irrigation faucet with pipe and sprinkler pipe and so on.     4. Chemical industry tube. Such as: oil cracking pipe, chemical equipment, heat exchangers and pipelines, stainless acid-resistant tubes, high pressure pi...

    Expiration date would tell us this product can use or not at the specific date. So does for the galvanized steel pipe, as they have similar life time too. How could we prevent the troubles galvanized steel pipe caused due to the long time using? Knowing the trouble and then figure out the dealing way would be a nice shoot.     Low water pressure: Corrosion in galvanized steel pipe may make lower water pressure throughout your house’s water pipeline because of the restriction of the whole transportation line.     Uneven distribution of water: You would know how angry you are when you find the uneven distribution of the kitchen waste water. Due to some of your steel pipes have low water pressure, while others don’t. Thus it would be a symptom of galvanized steel pipe. And corrosion can build up unevenly.     Discoloration of water: Galvanized pipes can release iron and cause discoloration. A clear indicator of this is a brown stain on a po...

    Generally speaking, outer thickening oil steel pipe, like the high quality seamless steel pipe, has been applied popular in the petrol production and many other products too. Today, Today, the oil production steel pipe is introduced.     First of all, we should know that OCTG, which is including pipe, casing, line pipe is the whole equipment for the oil production process. There are lots of troubles for pipes during the process which we need to handle, such as during production process, loss of wall thickness such as rod wear, relatively large areas of corrosion is one of the main sources of failure of used oil well piping. Under this situation, so we should figure out that outer thickening oil pipe would be necessary for oil production. In addition, thread gluing is a common failure of oil piping found during manufacture and operation and this is another trouble we need to handle. So that checking for quality before application would be an important step for m...

    High frequency straight seam welded pipe after welding, the heat treatment is a new elimination of residual stress technology. Before welding, the material is preheated to the post-heat treatment temperature and the weld is continuously heated during the welding process to maintain this temperature. After the welding is completed, it is warmed by the heat-insulating cotton to cool it slowly. This method can effectively reduce the welding residual stress, improve the metal resistance to stress corrosion.     Non-destructive testing of the weld due to the pipeline in the water supply project is a large steel pipe, especially the thickness of t = 30mm steel pipe is used as a pipe bridge, it is necessary to bear the water pressure, but also bear the weight of the steel pipe and water bending moment, so the quality of the welding requirements are particularly high. For the pipe with t = 30mm thick large diameter steel pipe, the longitudinal seam and ring joints are ...

    (1) High frequency straight seam welded pipe forming process is small rebound, the remaining stress is small.     (2) Deformation hardening effect is small, the whole circle after the geometric standard is accurate, conducive to ensuring the construction and welding quality.     (3) High frequency straight seam welded pipe weld shape is good, not prone to undercut, the surface welding is not a medium defect.     (4) High frequency straight seam welded pipe bead distribution in the circumference of a point, therefore, according to the requirements of the weld on the favorable position.