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Pipe forming rollers usually wear out too fast because of excessive forming pressure, incorrect roll gap, poor mill alignment, unsuitable roller material, inadequate lubrication, worn shafts or bearings, and poor strip condition. Before replacing the rollers, inspect the complete forming system to identify the actual cause.

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A tube mill may be shut down for a few days, a planned holiday, maintenance work, or even several months. What happens to the forming rolls during that time is easy to overlook. The machine is not running, so there is no obvious production problem. But when the line is started again, operators may suddenly find rust spots on the roll surface, marks on the tube, or a roll that no longer looks the way it did before the shutdown.

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If you’ve been running an ERW tube mill for a while, this probably sounds familiar.

The pipes come out looking clean. Surface looks good. Everything seems fine—until you take a closer look at the weld seam.

That’s usually where the trouble begins.

No matter how good the galvanized strip is, the welding process itself changes things. The zinc layer at the seam doesn’t stay intact. And once that protection is gone, the risk of rust goes up quickly.

Left untreated, it’s only a matter of time before corrosion shows up—and spreads.

In this article, we’ll go through what’s really happening at the weld seam, why some common solutions don’t work as well as expected, and a more practical way many factories are now using to deal with it.