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What is the fiber welding sequence for flanges

Fiber and communications infrastructure knowledge brief Published 12 Sep 2021

Use this reference to prepare product questions for CJC FIBRE. Check interfaces, capacity, protection and installation requirements against the current product documentation.

Arrange the fiber welding sequence for flanges by alternating weld or adhesive passes around the flange in a cross or star pattern, ensuring even heat distribution and minimal distortion.

General Principles

When welding or bonding fiber-reinforced flanges, the sequence of welds or adhesive applications is critical to prevent misalignment, uneven stress, and distortion. The key principles include: Start with tack or initial bonding points: Position the flange on the pipe and secure it with temporary tacks or clamps to maintain alignment. Ensure the flange is square and level using a measuring tool or level.

Use a cross or star pattern: Apply the first weld bead or adhesive at one point, then move to the opposite side of the flange. Continue alternating around the flange in a star-like pattern to distribute heat and stress evenly. Incremental passes: For larger flanges, perform multiple passes in small increments rather than completing one side fully before moving to the next.

This reduces localized heat buildup and prevents warping. Check alignment frequently: After each pass, verify that the flange remains properly aligned and that bolt holes are correctly positioned. Bolt tightening sequence: Once the flange is bonded or partially cured, tighten bolts in a crisscross pattern to the recommended torque, gradually increasing in steps.

This ensures uniform compression and prevents gasket or fiber damage. Use heating blankets if required: For certain fiber flanges, a heating blanket may be applied to maintain curing temperature. Position the thermostat inward (6 o'clock) and ensure even coverage.

Step-by-

Step Example

Place the flange on the pipe and align it squarely. Apply initial tack points or adhesive at 12, 3, 6, and 9 o'clock positions. Fill in intermediate points between the tacks, alternating sides to maintain balance.

Complete the full circumferential weld or adhesive layer in small, controlled passes. Gradually tighten bolts in a crisscross sequence to the recommended torque. Recheck alignment and torque after curing or final bonding.

Additional Tips

Ensure all surfaces are clean and free of contaminants before bonding. Lubricate washers and bolts to achieve proper torque without damaging the flange. Follow manufacturer-specific instructions for adhesive type, curing time, and temperature control.

By following this alternating, incremental sequence, you can achieve a strong, leak-proof flange connection while minimizing distortion and stress in fiber-reinforced piping systems.

What is the fiber welding sequence for flanges - CJC FIBRE CONSULTANTS [PDF]

What is the fiber welding sequence for flanges

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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