4: THE MANUFACTURE OF ELECTRIC RESISTANCE WELDED PIPE On GlobalSpec

4 THE MANUFACTURE OF ELECTRIC RESISTANCE WELDED PIPE

We next examine the basic steps necessary to produce electric resistance welded (ERW) pipe.

Coil Feed Ramp

The coils are removed from storage and placed on the feed ramp (see Figure 4.1). Each coil is fed into the uncoiling unit.

Figure 4.1: Coil Feed Ramp

First Forming Section

The roll transition section receives the product from the first forming section and continues the "rounding-up" process (see Figure 4.2).

Figure 4.2: First Forming Section

Final Forming Pass Section

This section of the forming rolls finishes the rounding process and prepares the edges of the strip for welding (see Figure 4.3).

Figure 4.3: Final Forming Pass Section

High-Frequency Welder

An automatic high-frequency welder heats the edges of the strip to approximately 2600 F at the fusion point location (see Figure 4.4). Pressure rollers squeeze these heated edges together to form a fusion weld.

Figure 4.4: Automatic High-Frequency Welder

In-Process Weld Nondestructive Inspection

After welding has been completed, it is inspected by independent nondestructive inspection units (see Figure 4.5).

Figure 4.5: Nondestructive Inspection Unit

Seam Weld Normalizing

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 (see Figure 4.6).

Figure 4.6: Seam Weld Normalizer

Sizing Mill

The pipe passes through a sizing mill to achieve the correct outside diameter (see Figure 4.7).

Figure 4.7: Sizing Mill

Cutting the Pipe

The pipe is then cut to the correct length (see Figure 4.8).

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