We next examine the basic steps necessary to produce electric resistance welded (ERW) pipe.
The coils are removed from storage and placed on the feed ramp (see Figure 4.1). Each coil is fed into the uncoiling unit.
The roll transition section receives the product from the first forming section and continues the "rounding-up" process .
This section of the forming rolls finishes the rounding process and prepares the edges of the strip for welding .
An automatic high-frequency welder heats the edges of the strip to approximately 2600 F at the fusion point location.
Pressure rollers squeeze these heated edges together to form a fusion weld.
After welding has been completed, it is inspected by independent nondestructive inspection units.
The weld area is then subjected to postweld treatment, as metallur-gically required, to remove residual welding stresses and produce a uniform normalized grain structure.
The pipe passes through a sizing mill to achieve the correct outside diamete.
The pipe is then cut to the correct length.
This is usually stage, where the pipes ends are faced and bevelled by the end facer. All these processes are continuous with automatic arrangements. These plain ended tubes further go for processing as per the customer requirements such as galvanizing, threading, black varnishing and more.
specification, Standard and identificationWelded steel pipe (steel pipe manufactured with a weld) is a tubular product made out of flat plates, known as skelp, that are formed, bent and prepared for welding.
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