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ERW Welded Pipe Production Line China

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An in-depth examination of electric resistance welding (ERW) weld nuggets as a quality control step in the manufacturing of high-strength tube and pipe used for pressure applications has been a proprietary procedure for some manufacturers for several years.

Regardless of the frequency of the power source used to make longitudinal butt welds in tube and pipe, a discernable hourglass shape signature is present when the ERW process is used.

The ERW tube and pipe industry usually separates the power sources available into the low-frequency range (rotary electrodes) and the high-frequency range (induction coil or sliding contacts).

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