International Conference on Welding Technology


9th Edition of International Conference on Welding Technology

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Efficient electro-resistive welding


David Garrard, Director – APAC, Xiris Automation Inc., Thailand, discusses inspecting large diameter pipe for weld and geometry defects.

The large diameter pipe (LDP) market is usually defined as including all pipes and tubes that have a diameter larger than 12 in. (30 cm). The primary target market for LDP is the oil and gas sector, but uses have also been found in power generation, transportation, petrochemical, construction, and more. Since the 1950’s, these pipes have been welded longitudinally using electro-resistive welding (ERW). The ERW’s popularity has grown over time, and so have its technical advantages and efficiency benefits.

Decades of improvements

The last few decades have seen significant improvements in almost all aspects of steel manufacturing – smelting, metallurgy, and rolling. This has led to improvements in the size, quality, and physical and chemical properties of hot-rolled steel strip used for large and medium-calibre ERW steel pipes.

Other ERW process improvements include:

  • Automated control of welding parameters.
  • Implementation of industry standards such as ISO9000 and APIQI.
  • Automated detection technology improvements using online or offline full-weld ultrasonic or eddy current testing …

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