Reinventing Integrity Inspection: DJI Drones Automate Welding Defect Detection for Shipbuilding

In the world of shipbuilding, the integrity of welds is paramount. Miles of seams on a single vessel must be perfectly sealed to ensure structural soundness and watertight safety. However, the traditional method for inspecting these welds for leaks—penetrant testing—is a notorious bottleneck, characterized by high costs, significant safety risks, and painstakingly slow processes.

The conventional approach requires certified technicians to work from scaffolding or manned baskets, manually applying soapy penetrant (bubble fluid) to welds while colleagues pressurize the opposite side of the steel plate. Any pinhole leak or lack of fusion (LOF) is revealed by the formation of bubbles. This method is not only slow and labor-intensive but also exposes personnel to unnecessary working-at-height hazards.

The Challenge: Efficiency and Safety in Modern Shipbuilding

A project lead at a major East Asian shipyard (our client) summarized the pain points:
"Our teams would spend hours on a single seam—setting up, spraying, and visually inspecting. The process was unpredictable, created scheduling delays, and carried inherent safety risks. We needed a smarter solution to maintain our quality standards without compromising on time or safety."

Our Solution: The Autonomous Aerial Inspection System

We developed a turnkey solution that integrates DJI Enterprise drones with a proprietary intelligent spraying module and a high-zoom payload camera. This system automates the entire penetrant application process, moving inspectors from the basket to the ground.

1，Intelligent Spraying Module: A precision payload attached to the drone ensures consistent, even coverage of penetrant fluid along the entire weld seam.

2，Pressurization: The area behind the target weld is pressurized with air, as per standard practice, forcing any leaking gas through potential defects.

3，High-Zoom Inspection: The drone, equipped with a stabilized camera capable of up to 400x zoom, acts as a powerful aerial observation platform. Operators safely scan the weld from a distance, identifying bubble formation with pinpoint accuracy.

The Workflow: Precision and Speed

The refined process is simple and devastatingly effective:

  Step 1: Pressurize. The compartment behind the target weld is pressurized.

  Step 2: Spray. The drone executes a pre-planned flight path, autonomously spraying the penetrant fluid across the entire weld length in approximately one minute.

  Step 3: Inspect. The drone hovers or flies slowly as the ground operator uses the powerful optical zoom to scan for bubbles. Detected flaws are geotagged for precise documentation and repair.

The Result: A task that traditionally took hours was reduced to minutes, representing an efficiency increase of over 150x, while completely removing personnel from elevated work environments.

Case Study: Tangible Results for a Global Shipbuilder

At our client's shipyard, the implementation was a resounding success:

1，Unmatched Efficiency: Drastically reduced inspection time per meter of weld.

2，Enhanced Safety: Eliminated working-at-height risks for the inspection team.

3，Superior Accuracy: The powerful zoom camera can identify smaller bubbles than the human eye from a safe distance, improving defect detection rates.

4，Digital Transformation: The process creates a digital record of the inspection, including geotagged images of defects for seamless integration into quality management systems.

"The shift wasn't just about doing the same job faster," the project lead noted. "It was about re-engineering our quality control for the modern era. This technology provides a clear return on investment and aligns with our goals for digitalization and worker safety."

The Future of Industrial Inspection

The applications for this technology extend far beyond shipbuilding. It is a viable solution for integrity inspection on storage tanks, pipeline welds, offshore platforms, and large-scale steel structures.

We are committed to pushing the boundaries of industrial drone applications, delivering cutting-edge solutions that solve real-world problems for our global clients.

Is weld integrity inspection a bottleneck for your operations?

Contact our solutions team to learn how our automated aerial inspection system can drive efficiency, enhance safety, and ensure quality on your project.

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