What is the difference between lsaw and dsaw

As ERW steel pipe and SAW steel pipe in the pipe during forming, welding and process is different, so that two kinds of steel pipe in the performance there are some differences. Saw steel pipe with solvent deposited, more types of defects, in addition to volume defects, there are wire-line trap. ERW steel pipe weld defects only wire-line and straight welds, the inspection process easy to follow, and the defects in the maximum reflection at, once the lack of implicit, ultrasonic reflecting the strong, easy to detect.

Since ERW pipe deformation in the deformation process more fully, coupled subsequent sizing flat oval, elliptical vertical changes and necking, making ERW pipe residual stress becomes smaller. The electrical arc is transmitted to the workpiece being welded through a consumable electrode.

To prevent oxidation from occurring, the electrode and molten base material are protected from oxidation by a flux powder. When the flux powder is brought into contact with the heat from the electrical arc, it melts and resolidifies as slag. Double submerged arc welding is commonly used in the oil and gas industry to make large diameter pipelines.

These pipelines typically have either a straight, longitudinal double submerged arc weld or a spiral double submerged arc weld. Other industries that use the double submerged arc welding include any that involve the joining of thick plates, such as heavy equipment, mining, or infrastructure projects such as bridges. Subscribe to our newsletter to get expert advice and top insights on corrosion science, mitigation and prevention. By: Della Anggabrata. Dictionary Dictionary Term of the Day.

Related Projects. Thank you and appreciate for your comment and answer Regards ZA. DSAW is commonly specified for heavy wall, large diameter piping used in gas transmission and high pressure fluid systems. Red Flag This Post Please let us know here why this post is inappropriate.

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Since the speed is very high, the contacted plate edge could be heated and melted inshore time, then extruded through the docking process. It is mainly used to make pipes with welded longitudinal seams or spiral seams. The welded pipe is welded by high-frequency welding technology and is mainly used for the transportation of pressurized fluids such as water, oil, and natural gas. So it has fast welding speed and high efficiency in production.

HFW pipe is widely used in the fields of oil and gas transportation, oil well pipeline, building structure, and various kinds of mechanical pipe. However, HFW steel pipe quality is affected by many factors, such as raw material and process.

And the production quality control becomes difficult. So the yield and welding process still need to be improved continuously.