Pipe weld X-ray inspection

What is automated pipe weld X-ray inspection?

It is digital radiography of pipe welds built into the manufacturing and QC line rather than run as a separate laboratory step. As pipe moves through, or as source and detector index around each joint, every weld is imaged and stored as a digital record. That replaces sampled film archives with a searchable file for each metre of pipe, so the evidence is complete rather than a statistical sample.

See: How the in-line system works, Digital record against film sampling

Pipe weld radiography kV range

The system uses a mini-focus X-ray source series at 160, 225, 320 and 450 kV, chosen by wall thickness and material, at a 100 percent duty cycle. Power runs from 640 W to 4,500 W across the series. Higher kV penetrates thicker or denser walls; the right point in the range depends on the pipe, so it is set to the product rather than fixed. Continuous duty is what lets the source keep pace with a moving line.

See: Source series and duty cycle

Can X-ray inspect every weld on a pipe instead of spot checks?

Yes, that is the point of building it into the line. Because the source runs at 100 percent duty cycle and the detector captures at up to 50 frames per second binned, the system keeps up with production and images each weld rather than pulling occasional samples for the film pit. The output is a digital record per joint, so full coverage becomes an archive you can search rather than a stack of radiographs.

See: Full-coverage in-line radiography, Why full coverage beats sampling

Digital radiography or film for pipeline welds?

Film still produces excellent images, but it is a chemical process with a physical archive and a fixed sampling rate. Digital flat panels here reach active areas up to 427 by 427 mm at 139 to 200 µm pixels and 50 fps binned, feeding a searchable record instead of a film library. The honest trade is up-front system cost against faster review, full coverage and no wet processing. Weigh it against your throughput and how often you have to retrieve an old weld record.

See: Detector and frame-rate figures

In-line weld inspection for a large-diameter pipe mill producing longitudinal seams

The feed-through configuration is built for that: it inspects the seam as the pipe travels through the system, and the system covers longitudinal, spiral and circumferential or planar welds. Single-wall and double-wall techniques are both available, so the technique matches the joint and the geometry. Because the source runs continuously and the panel captures at up to 50 fps binned, the inspection sits inside the line rather than becoming a bottleneck behind it.

See: Feed-through configuration and weld types, Matching the rig to the mill

X-ray system for circumferential girth welds on fabricated joints

The weld-joint configuration positions the source and detector around each joint, which suits circumferential and planar welds on fabricated sections rather than a seam running through a moving pipe. Single-wall and double-wall techniques are both offered, so a joint that can only be shot double-wall is still covered. Source energy comes from the 160 to 450 kV mini-focus series, selected for the wall thickness at each joint.

See: Weld-joint configuration

Which wall thickness technique do we need, single wall or double wall?

It depends on access to the joint. Single-wall shooting places the detector against the far wall for the cleanest image and is preferred where the geometry allows it; double-wall is used when the pipe cannot be entered or the detector cannot be positioned inside, at the cost of imaging through two walls. The system supports both, and the choice is driven by pipe diameter, access and the applicable code rather than by the equipment. We do not publish a maximum wall thickness figure; it follows from source energy and technique.

See: Single-wall and double-wall techniques, Technique choice by geometry

High-throughput weld radiography without a manned film darkroom

Continuous duty and fast digital capture are what remove the darkroom. The source runs at a 100 percent duty cycle and the flat panel reaches 50 fps at 2 by 2 binning, so images are formed and reviewed on screen as pipe or joints move through, with no wet processing and no film handling between shot and read. That shortens the loop from exposure to accept-or-reject decision and takes the chemistry, the storage and the disposal out of the process.

See: Duty cycle, frame rate and detectors

Does the pipe weld system produce a traceable record for each joint?

That is the reason to go digital in the line. Instead of a sampled film archive, the system produces a searchable digital record for each metre of pipe, so a specific weld can be recalled long after the pipe has left the mill. The images come off flat-panel detectors up to 427 by 427 mm, which the imaging software reviews, annotates and stores. Pair that with your own traceability numbering so each record ties back to a heat, a joint and a shift.

See: Searchable per-joint record, The imaging suite that reviews it

We run a pipe mill and want radiography inside the line rather than a separate inspection bay. What does that change?

It changes inspection from a downstream gate into part of production. The feed-through configuration reads the seam as the pipe travels through, at a 100 percent duty cycle and up to 50 fps binned, so throughput is not throttled by a batch trip to a film pit. Full coverage replaces sampling, and the output is a searchable record per metre rather than a shelf of radiographs. The trade is that the rig is built to your line geometry up front, which is why it is configured to the mill instead of shipped as one fixed cabinet.

See: In-line feed-through inspection, Line-integrated against a bay

Our pipeline mixes longitudinal, spiral and girth welds. Can one system handle all of them?

Between the two configurations, yes. The system inspects longitudinal, spiral and circumferential or planar welds, with the feed-through arrangement reading seams as pipe moves through and the weld-joint arrangement positioning source and detector around a fixed joint. Both single-wall and double-wall techniques are available across the 160 to 450 kV source series. Which configuration and technique apply to each weld type is worked out from your pipe range, so bring the full product mix to the design review rather than one representative pipe.

See: Configurations and weld types, Working through a mixed weld mix

How does a digital weld archive help years later when a pipeline section is investigated?

It turns a needle-in-a-haystack film search into a query. Because the system stores a searchable digital record for each metre of pipe, the radiograph of a specific weld can be pulled up when a section is investigated, rather than hoping the joint fell inside the film sample. The images retain the detector resolution they were captured at, up to 427 by 427 mm panels at 139 to 200 µm pixels, so a later reviewer sees the same evidence the line saw. Set your retention policy and back-up regime around that archive.

See: Searchable per-metre record, Software behind the archive

Why buy pipe weld radiography from an independent supplier rather than a major-power vendor?

Weld inspection data is a record of the integrity of your own pipeline, and the source is the most export-sensitive part of the system. Buying the sources, the detectors and the software from one non-aligned team keeps the machine, the spares and the inspection records inside your jurisdiction and off another country's approval calendar. That is what keeps the line running to your schedule and keeps the evidence of which welds were accepted where it belongs.

See: One team, non-aligned supply, Full system specification

We have a general in-house X-ray cell already. Do we still need a dedicated pipe weld system?

A general inspection cell handles parts on a turntable; it is not built to read a continuous seam as pipe moves through a mill at production speed. The pipe weld system is configured to the mill geometry with feed-through and weld-joint arrangements and a source at 100 percent duty cycle for exactly that continuous, high-volume job. If your pipe volume is high and you want every weld covered in the line, the dedicated system does what a general cell cannot. If volumes are low, a general cell may be enough; the deciding factor is throughput and coverage.

See: Purpose-built pipe weld system, General in-house inspection cells

How do we keep a pipe weld inspection line running for its full service life without a foreign spares queue?

Plan the sources and the software as the two long-lead items. The mini-focus X-ray series is the consumable that decides how long the line stays productive, and the review software is what has to be maintained as codes and formats change. Both come from the same non-aligned organisation that builds and supports the system, so the spares queue is not ordered by another country's export timetable. Sources, detectors and software on one accountable supply line is the structural answer to sustainment rather than a warranty clause.

See: Sources rebuilt in-country, Sustainment on a single supply line

What is Pipe weld X-ray inspection?

Pipe weld X-ray inspection is Unstrat's Land (Land Domain) capability: A pipe mill lives or dies by weld quality, and radiographic film is too slow for a production line. The pipe weld X-ray inspection systems automate digital radiography of longitudinal, spiral and circumferential welds directly in the manufacturing and QC line, in both single-wall and double-wall techniques. Two configurations cover the mill's geometry: a feed-through system that inspects the seam as pipe travels through, and a weld-joint system that positions source and detector around each joint. X-ray sources span 160 to 450 kV mini-focus series at a 100% duty cycle, matched to digital flat-panel detectors with active areas up to 427 × 427 mm and frame rates to 50 fps binned, with cabinet and manipulator engineered to the line's requirement. The result is a digital weld record for every metre of pipe instead of a sampled film archive: searchable, auditable and available the moment the weld passes the detector. For SAW pipe plants, cross-country pipeline projects and any fabricator certifying welds to a national standard, it moves weld assurance from the lab bench into the line itself.

How does Pipe weld X-ray inspection work?

Pipe weld X-ray inspection delivers its effect through automated digital radiography in the manufacturing and QC line, not a separate lab step, Inspects longitudinal, spiral and circumferential / planar welds and Single-wall and double-wall inspection techniques, capabilities matched to the requirement and confirmed under briefing rather than published.

Who makes Pipe weld X-ray inspection?

Pipe weld X-ray inspection is built by The NDT Systems House, whose focus is non-destructive testing. Unstrat represents The NDT Systems House to government and enterprise buyers worldwide as an independent, non-aligned prime vendor.

Why choose Pipe weld X-ray inspection over a major-power alternative?

Pipe weld X-ray inspection is sourced from an independent, non-aligned manufacturer, so it carries no major-power disclosure rules, upgrade-locks or political ramifications. Concretely: Feed-through and weld-joint configurations built to the mill's geometry, in single-wall and double-wall techniques. The capability is accountable to you, not to a foreign vendor's government and its release schedule.

How is Pipe weld X-ray inspection procured, and where can it be exported?

Automated digital radiography of every weld in the pipe line itself, replacing sampled film archives with a searchable digital record for each metre of pipe. Every engagement begins with a briefing, and export eligibility is confirmed per market under briefing rather than published. Where controlled capabilities are involved, the classification and end-user-certificate chain is confirmed first. Pipe weld X-ray inspection is then sustained in-region by one accountable team from briefing through long-term operation.