Weld Root Erosion Scanner

A handheld, single-axis scanner ideal for TOFD inspection of welds of any material. The WREN can be operated using one hand so is particularly operator-friendly for site use, especially in areas with limited access.

A compact frame for accurately positioning transducers for TOFD inspection of welds. Available in two lengths: the WREN 4 is 135mm and the WREN 8 is 235mm. The scanner provides a sturdy, accurate frame giving high-quality, reliable inspection data. It operates in any orientation on surfaces from 2″ pipe up to flat and is suitable for inspecting welds on pipework, pressure vessels, storage tanks, and structural components.

It holds a single pair of transducers with the wedges attached to the scanner using spring-loaded gimballing pins. The attachment of the wedges allows some compliance between the two TOFD transducers permitting inspection of mismatched or irregular welds.

Phoenix ISL manufactures a range of WREN wedges in brass or high-temperature stainless steel with a reduced land, enabling the wedges to sit closer to the weld cap and are ideal for inspections in difficult-to-access areas and for minimising the transducer separation for specific inspections.

It includes a high-resolution, waterproof wheel encoder that can operate with any encoded TOFD instrument.

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Weld Root Erosion Scanner


Standard Kit

  • WREN scanning frame
  • Spring loaded waterproof wheel encoder with 5m cable
  • Couplant tube and ‘Y’ connectors
  • Durable carry case


  • 135mm or 235mm long TOFD scanning frame
  • WREN 4 PCS: Minimum 18mm / Maximum 122mm
  • WREN 8 PCS: Minimum 18mm / Maximum 218mm
  • Spring loaded waterproof wheel encoder. IP68 rated (immersion up to 1m)
  • Encoder Resolution: 65.6 steps/mm


  • Quick release adjustment throughout
  • Can be operated using one hand
  • Optimal solution for rope access work due to compact size and tool free design
  • Ideal for site use in areas with minimal access
  • Can inspect mismatched or irregular welds
  • Transducer separation can be minimised for specific inspections
  • WREN wedges, with a reduced land, sit closer to the weld cap
  • For use with any manufacturer’s instrumentation

Downloads and Documentation