Choosing a Weld Inspection Scanner? Start With the Welds You Actually Inspect

Before you compare weld inspection scanners, pull up a few recent jobs.

Look at the pipe sizes, weld locations and access restrictions. Think about where the technician stood, how the equipment was positioned and what had to move before scanning could begin.

Those details give you a better starting point than a specification sheet alone.

A scanner might work well on an open section of pipe in a demonstration. Your next job could put that same scanner beside a support, close to a flange or in a space where the operator has limited room to reach it.

The question is whether the equipment fits the work your crew regularly takes on.

Look beyond pipe diameter

Pipe diameter is an obvious place to start when choosing an ultrasonic weld inspection scanner. It is also easy to give that number more weight than it deserves.

Ask what the listed range actually describes. Is it the range of the probe mechanism, or the operating range of the complete scanner with your required probe arrangement?

Those are different measurements. ScanTech’s RADIX specifications, for example, distinguish the self-adjusting probe mechanism’s surface range from the operating diameters of the complete scanner configuration.

Then consider the space around the weld. A scanner that fits the pipe still needs room to travel. Probe holders, cables and couplant lines all need clearance.

Before a demonstration, send the manufacturer photographs and dimensions of a typical inspection location. Include the nearby obstructions. A close-up of the weld alone may leave out the part that makes the job difficult.

Check both scanning directions

A circumferential weld runs around the pipe. An axial, or longitudinal, weld runs along its length.

If your team inspects both, ask to see the scanner configured for each direction. Watch the changeover as closely as the scan itself.

Which components move? Do attachments need to be removed? Are tools required? Can the technician reach the adjustment points once the equipment is on the pipe?

For a useful comparison, have the person demonstrating the scanner start with one configuration and change it to the other. That gives your team a chance to assess the actual handling involved.

It also makes training questions easier to identify. An adjustment may look simple when someone familiar with the equipment performs it. Your operators need to understand how to repeat it.

Watch what happens at the probes

It is natural to watch the scanner move during a demonstration. Spend some time watching the probe assembly, too.

Ask the demonstrator to explain how the probes follow the surface, how contact force is maintained and what adjustments are needed when the curvature changes.

On RADIX, a constant-force spring mechanism and patented anti-tip gimbals help maintain stable probe contact. Its circumferential probe mechanism accommodates a specified range of curved and flat surfaces without probe-angle or spring adjustments. Tool-free attachments allow configuration changes between inspection arrangements.

Have the manufacturer demonstrate those features on a surface relevant to your application. Ask which setup checks your technician still needs to complete after a change.

A self-adjusting mechanism can simplify part of the mechanical setup. Your team still needs to establish the correct inspection configuration.

Compare manual and automated operation on the same job

If you are considering automation, bring a specific application to the discussion.

Describe the weld length, access, number of inspection locations and how often the equipment must be repositioned. Ask to see how the proposed configuration handles those conditions.

For manual operation, pay attention to the operator’s reach and ability to guide the scanner through the required travel. For automated operation, look at drive control, cable routing, power arrangements and how the scanner is recovered when the pass is complete.

RADIX supports manual or automated scanning of axial and circumferential welds. Its automated configuration uses compact driven wheel packs, removing the need for a separate driving crawler.

Whether that arrangement suits your crew is something to evaluate against your jobs. Ask to handle the equipment and complete the setup yourself during the demonstration.

Bring a difficult application to the demo

Your easiest inspection probably will not tell you much about the limits of a scanner.

Choose a job that raises questions. Perhaps clearance is tight, the crew changes scanning directions frequently or positioning the equipment takes more effort than expected.

Bring what you have:

• Pipe dimensions and wall thickness.

• Weld geometry and scanning direction.

• Required probe and wedge arrangement.

• Photographs showing access and nearby obstructions.

• Instrument and encoder connection requirements.

• Available power and couplant arrangements.

The manufacturer can use that information to discuss a configuration, identify limitations and explain what needs further verification.

You should leave with a clear understanding of how the scanner would be set up for your application, what the technician would need to do and which questions remain open.

Talk through your application with ScanTech

If you are evaluating equipment for axial or circumferential ultrasonic weld inspection, we can help you review the RADIX configuration for your application.

Share your pipe dimensions, probe arrangement and access concerns. We will discuss how the platform fits the job and what you should see in a demonstration.

Explore the RADIX modular weld inspection platform or schedule a conversation with ScanTech.