Orbital Weld Borescope Inspection for Sanitary & High-Purity Piping

Introduction

Orbital weld borescope inspection is a specialized process of using micro borescopes (tiny flexible cameras or fiberscopes) to visually examine the interior of orbital welds. Orbital welding is an automated welding technique widely used in sanitary and high-purity piping systems (such as those in biopharmaceutical, food/beverage, and semiconductor industries) to create smooth, consistent weld beads. Ensuring these welds are clean, defect-free, and smooth is critical for hygiene and performance. Standards like ASME BPE (BioProcessing Equipment) mandate thorough internal visual examination of each weld and documentation of the results. In practice, that means BPE weld inspection often relies on remote visual tools; essentially using a weld inspection camera (borescope) to inspect and validate every weld’s quality. This approach is essential for meeting FDA regulations in pharma/food and preventing contamination or leaks in high-purity systems.

Stainless process piping with multiple orbital welds. Sanitary piping systems in biotech, food, and semiconductor facilities rely on automated orbital welding to ensure clean, repeatable joints. Inspecting these welds internally with a “sanitary piping borescope” verifies they meet smoothness and quality standards for hygiene and safety.

An orbital weld borescope inspection involves inserting a micro borescope into the tubing to get a close-up view of the weld interior surface. These borescopes provide magnified, illuminated images of the weld bead, allowing inspectors to spot defects such as cracks, incomplete penetration or fusion, discoloration, porosity, or contaminant residue. Because the inspection is done internally, it’s a non-destructive testing (NDT) method. You can assess weld quality without cutting or disassembling any pipes. In high-purity piping, this is invaluable: it avoids rework while ensuring the welds will not harbor bacteria, corrode, or fail under pressure. Orbital weld borescope inspections are typically performed both on newly installed welds (as part of system validation) and periodically on in-service welds during maintenance to catch any developing issues.

Why Flexible Fiberscopes Are Essential for Orbital Weld Inspection

Inspecting orbital welds inside piping presents a unique challenge: the welds are often deep within complex pipe runs with bends and elbows. A flexible fiberscope, a type of micro borescope with a flexible, snake-like insertion tube, is essential for navigating these tight turns and long runs. Unlike rigid scopes, flexible borescopes can snake through U-bends and elbows without requiring disassembly of piping. For example, high-purity process lines often have 90° bends and narrow diameters. A flexible scope can weave through sharp bends while maintaining image quality. This flexibility allows the inspector to reach welds that would otherwise be inaccessible.

Another key advantage of flexible micro borescopes is the ability to rotate and maneuver the tip once positioned at the weld. By twisting or rotating the scope, the technician can view the entire circumference of the weld bead. Orbital welds extend completely around the tube’s interior, so a full 360° examination is required. A rigid camera might only provide one viewing angle, but a flexible fiberscope allows progressive angling around the entire weld, ensuring no section is missed. Many micro borescopes also support interchangeable or articulating tips, including side-view optics, which are discussed next.

In short, a flexible scope with a small diameter, often just a few millimeters, is the only practical way to internally inspect orbital welds in typical sanitary tubing sizes, commonly ranging from 1/2 inch to 4 inch diameter pipes. Zibra Corp specializes in such micro borescopes. Our flexible fiberscopes are engineered to maintain high-resolution imaging through tight-radius bends and long distances, solving the common challenge of reaching welds deep within a system.

Choosing the Right Direction of View: Forward vs. Side vs. Angled Optics

When performing high-purity piping weld inspection, the borescope’s direction-of-view (DOV) is a critical factor. There are three main viewing configurations for borescopes: forward-view, side-view, and angled (oblique) view. Each has its role in orbital weld inspections:

Forward View (0° DOV): A forward-view borescope looks straight ahead down the pipe, making it ideal for navigating and spotting welds or foreign objects. It is especially useful for identifying loose debris or FOD inside sanitary or high-purity piping. However, a straight-on view may not fully reveal the weld bead, and parts of the weld can remain hidden in shadows.
Side View (90° DOV): A side-view borescope looks directly at the inner pipe wall, providing the clearest angle for inspecting weld bead shape, penetration, and surface quality. This is the most common choice for orbital weld inspection in high-purity systems, where full circumferential clarity is required. Because it looks sideways, inspectors often use a forward view first to locate the weld before switching to side view for detailed evaluation.
Angled or Dual View: Angled optics such as 30° or 70° views let you see both forward and partially sideways, helping reduce shadowing when inspecting welds. Dual-view borescopes combine forward and side perspectives in a single probe, allowing technicians to locate and examine the weld without removing the scope. This improves speed and accuracy by minimizing blind spots and reducing the need to swap tips mid-inspection.

Many inspectors begin with a forward-view borescope to navigate piping and locate each weld, then switch to a side or angled view for a detailed inspection. Dual-view borescopes are ideal because they eliminate the need to swap tips or probes, making the process faster and more reliable. Choosing the right direction of view helps avoid blind spots and ensures the entire weld bead is clearly visible and properly documented.

Step-by-Step Orbital Weld Inspection Workflow

Performing an orbital weld inspection with a micro borescope is a systematic process. Below is a step-by-step workflow outlining best practices to ensure you thoroughly inspect each weld and document the results:

Plan and Locate the Weld: Start by reviewing the weld map or piping layout to identify weld locations. Use a forward-view or dual-view borescope to navigate through the tubing and locate the target weld. Distance markings and visual cues such as discoloration help confirm when the weld appears on screen.
Center and Focus on the Weld Bead: Position the borescope to get a clear view of the weld, centering it if using a forward view or aligning directly if using a side-view optic. Adjust lighting and focus to make the weld bead and surface texture sharp and visible. Proper image clarity is key to identifying subtle defects.
Inspect the Entire Circumference: Rotate the scope slowly to inspect the full 360 degrees of the weld. A flexible fiberscope makes this easier by allowing in-place rotation and tip bending for detailed inspection. Slightly overlapping your views ensures no area is missed.
Check for Defects and FOD: Look for cracks, porosity, fusion issues, undercut, or signs of overheating like dark discoloration. Also check for foreign object debris such as welding spatter or residue that could compromise sanitary conditions. Confirm that the weld meets visual acceptance standards for your industry.
Document Findings (Images & Notes): Capture at least one clear photo or video of each weld for records, even if it appears perfect. Use image labeling or notes to link visuals to the corresponding weld ID. Mark any defects or concerns to simplify reporting and compliance tracking.
Rotate to Next View or Section (if needed): Reposition the borescope if the weld is large or partially hidden from view. Switch to a different viewing angle if necessary to complete the inspection. Ensure full coverage of the weld from all relevant perspectives.
Withdraw and Log the Result: Remove the borescope carefully to protect internal surfaces, then log inspection results immediately. Record the weld ID, inspector name, date, pass/fail status, and link to saved images. Accurate logs ensure full traceability and simplify future validation or audits.

Documentation and Validation: Weld Maps, Logs, and Compliance

Thorough documentation of each weld inspection is not just bureaucracy. It directly supports smoother audits, validations, and regulatory compliance. In industries like biopharma or food, a system’s validation package will include evidence that all welds were inspected and met quality criteria. Here’s how to approach documentation in orbital weld borescope inspections:

Weld Maps and Unique IDs: A weld map is a diagram that assigns a unique ID to every weld in the piping system. During orbital weld borescope inspection, each image or video should be clearly linked to its corresponding weld ID. This process helps ensure that no weld is overlooked and supports validation by creating a complete, traceable inspection record.
Weld Inspection Logs: A weld inspection log documents key details for each weld, such as the ID, inspector name, inspection date, and results. Following ASME BPE guidelines, logs should indicate whether each weld was accepted, rejected, or flagged for rework. Keeping logs aligned with weld maps helps prove every weld was properly inspected and accounted for during audits.
Image and Video Documentation: Images and videos from your borescope inspection provide critical evidence for quality assurance and regulatory audits. Save and organize files by weld ID so they can be easily matched with the inspection log. This structured documentation helps validate weld quality and shows that your facility follows controlled inspection procedures.
Supporting Compliance and Validation: Complete documentation of weld inspections supports compliance with FDA and ASME BPE standards for sanitary systems. Inspecting each weld with a micro borescope and maintaining detailed records ensures your system meets visual and structural quality requirements. Weld maps and logs simplify validation by providing clear evidence that all welds were reviewed and approved before service.
Traceability and Future Maintenance: Accurate records help trace the history of every weld for future reference or re-inspection. If a weld fails after years of service, documentation allows quick identification and review of its inspection history. This traceability supports preventive maintenance planning and reinforces the integrity of high-purity piping systems.

In summary, borescoping weld maps and keeping detailed logs are just as important as the act of inspecting the weld itself. They ensure you can prove the quality of every weld and thereby smooth the path for validation and audits.

Tool Selection Checklist: Choosing the Right Weld Inspection Borescope

Selecting the proper orbital weld inspection camera (borescope) is critical to achieving clear results and a efficient workflow. Below is a checklist of key features and considerations when choosing a borescope for sanitary and high-purity piping weld inspections:

Diameter of Probe: The borescope diameter must be small enough to fit into the piping you are inspecting. Zibra’s micro borescopes are available in sizes for pipes as small as 1/4 inch, providing the clearance needed for accurate internal weld inspections. Smaller diameters may reduce light or resolution, so it is important to balance size with image performance.
Working Length: Choose a borescope long enough to reach the farthest weld without disassembling your system. Zibra’s flexible scopes are designed for extended runs and tight bends in high-purity piping. Consider pushability and rigidity when selecting a length to ensure you can inspect thoroughly with minimal strain.
Direction of View & Optics: Orbital weld inspections often require a side-view borescope to clearly examine the weld bead. Forward-view scopes can be used for navigation, and dual-view or angled optics improve inspection speed and accuracy. Ensure your borescope delivers high-quality, distortion-free imaging for any direction you need to inspect.
Image Quality (Resolution): High resolution is essential for spotting tiny weld defects like cracks, porosity, or discoloration. Zibra’s micro borescopes deliver sharp imaging even in sub-3mm diameters using dense fiber bundles and precision optics. Always test image clarity on sample welds to confirm it meets your QA needs.
Illumination: Bright, adjustable lighting is critical for inspecting reflective stainless interiors. Zibra offers high-output LED and fiber optic light sources to ensure small-diameter scopes deliver clear visibility. Diffused or angled lighting can help reduce glare from electropolished welds and improve image detail.
Maneuverability and Articulation: Articulation allows you to bend the borescope tip to inspect around corners or fully scan welds. Zibra offers articulated videoscopes and flexible fiberscopes that navigate tight piping without damaging polished surfaces. Durability and a smooth sheath are key to preventing probe damage or scratching sanitary tubing.
Recording and Measurement Capabilities: Borescopes should support photo and video capture to document weld inspections clearly. Advanced scopes may offer measurement tools to size defects or compare them against acceptance criteria. At minimum, ensure your system allows timestamped images with weld IDs for audit and compliance records.
Ease of Use and Ergonomics: Field-friendly features like lightweight design, long battery life, and large displays improve workflow and reduce fatigue. Zibra systems prioritize user comfort, reliable articulation, and fast image access. Choose a scope that is easy to handle during long inspections or in challenging environments.

By checking each of these factors, you can select a borescope system optimized for orbital weld inspections. The right tool will make the job faster, more effective, and safer for your piping. Zibra Corp offers a range of micro borescopes and customization options specifically to address these needs. From ultra-thin, flexible fiberscopes for <1” tubing, to high-definition videoscopes with dual view capability for comprehensive weld inspection. The key is to have a scope that provides the access, clarity, and documentation features required for your specific applications.

Ready to find the right scope for your application? Whether you need guidance choosing the best model, a custom configuration, or placing an order, our team will work with you to ensure you get the perfect solution for your inspection needs.