Motorised Weld Scanner

SAW Bug is a motorised, magnetic-wheeled buggy that can carry up to six ultrasonic TOFD and/or phased array transducers. It is designed for the single axis inspection of circumferential welds on carbon steel pipelines from 4”OD up to flat.

With a four-wheel drive system, the magnetic buggy has excellent grip and drive power and delivers constant speed whether ascending or descending the inspection surface.

The standard SAW Bug holds four transducers: typically two phased array and two TOFD probes but can accommodate up to six probes. Its compact design makes it adaptable for the inspection of a wide range of welds from 4” OD pipes up to large vessels.

The single axis motor is controlled via a simple remote handset offering forward and reverse drive options and variable speed control for the non-steerable magnetic wheels. The motor power unit includes an emergency stop for safety and outputs the live motor encoder signals directly for connection to any industry standard instrumentation.

A corrosion mapping arm is also available, as an optional extra, for SAW Bug to carry out C-scan inspections.

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Motorised Weld Scanner


Standard Kit

  • 1 x Buggy with 4 magnetic wheels
  • 1 x Adjustable probe frame
  • 1 x Single axis Drive motor controller unit
  • 1 x Remote handset
  • 1 x Laser guide
  • Umbilical cable bundle for motor, couplant and probes
  • Phased Array and/or TOFD Tool-posts (specify code when ordering)
  • 1 x Encoder synchronisation cable (specify instrument when ordering)
  • 1 x Run-off mat
  • Rugged carry case


SAW Bug - Motorised Single Axis Weld Scanner


  • Compact, low profile design: 200 x 220 x 120mm
  • Lightweight at only four kilograms
  • Range: 4” OD up to flat
  • Speed adjustable from 5-100mm/sec
  • Compact motor controller for easy transportation
  • Holds up to six probes
  • Quick release probe adjustment
  • Probes independently sprung and gimballed
  • Robust construction for site conditions
  • Strong magnetic wheels for use on painted surfaces


  • Low cost automated single axis inspection
  • C-scan inspection with optional corrosion mapping arm
  • Quick to setup and operate
  • User-friendly operation with simple control handset
  • Compatible with all instruments with encoding capabilities
  • Powerful four wheel drive system gives excellent grip and performance to overcome small obstructions
  • Laser guide for alignment
  • No tools required, simple to adjust probe position with thumbscrews

Downloads and Documentation