
Electric resistance welding is a welding process in which metal parts in contact are permanently joined by heating them with an electric current, melting the metal at the joint. Electric resistance welding is widely used, for example, in manufacture of steel pipe and in assembly of bodies for automobiles.
The fundamental difference between Seamless Pipes (SMLS) and ERW pipes is that the former is made of round steel billets that are heated and perforated, with no welds around the body; while ERW pipes are made of hot-rolled coils that are bent and deformed into circles or squares by a forming machine. , and then use the skin effect and proximity effect of high-frequency current to heat and melt the edge of the tube blank, and perform pressure welding under the action of the squeeze roller to achieve production. There is a longitudinal weld parallel to the steel tube on the surface.
Where are ERW and seamless pipes used?
Generally speaking, seamless pipes are used where high pressure is required, and ERW pipes are used in medium and low pressure areas.
Common standards for ERW pipe:
The most common one on the market is ASTM A53 ERW Pipe. ASTM A53 refers to the steel pipe standard set by the American Society for Testing and Materials (ASTM). It is suitable for general welding and seamless pipes for various purposes such as water supply, gas, steam, air conditioning and heating. Carbon steel pipe. The standard is divided into two types: Type E (Electric resistance welded pipe) and Type S (seamless pipe).
ERW pipe uses:
For ERW Line Pipe
For ERW Casing
For ERW Structure Tube
For High Pressure and High Temperature