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Methods for riveting and welding cable tray elbows

Fiber optic splice closure knowledge brief Published 06 Jan 2024

Prepared for preliminary research by the RIVO OPTICAL knowledge desk. Confirm cable count, splice capacity, sealing class, tray layout, protection sleeves and installation requirements against current standards and product documentation.

Cable tray elbows can be joined using either riveting for mechanical fastening or welding for permanent, strong joints, depending on material, load, and installation requirements.Riveting Methods

Riveting is a mechanical fastening method suitable for lighter-duty or modular cable tray systems. Key steps include:

  • Material Preparation: Cut and bend the metal sheets to the required elbow angle (e.g., 45° or 90°) using a shearing and bending machine .
  • Drilling Holes: Align the elbow sections and drill holes at the joint points for rivets.
  • Rivet Selection: Use appropriate rivets (aluminum, steel, or stainless steel) based on tray material and environmental conditions .
  • Fastening: Insert rivets and use a rivet gun or hammer to secure the joint. Ensure tight, uniform fastening to maintain structural integrity.
  • Inspection: Check alignment, spacing, and tightness to prevent gaps or misalignment that could affect cable support. Riveting is advantageous for ease of assembly, disassembly, and field adjustments, but it may not provide the same strength as welding for heavy-duty or high-load applications.
Welding Methods

Welding provides a permanent, strong joint, ideal for heavy-duty cable trays or high-stress installations. Common welding methods include:

  • Preparation: Clean and align the elbow sections. Ensure edges are smooth and free of coatings that may interfere with welding .
  • Tack Welding: Temporarily attach the elbow sections using tack welds to maintain alignment.
  • Full Welding: Perform continuous welding along the joint using appropriate techniques such as MIG, TIG, or arc welding, depending on the material (galvanized steel, stainless steel, or aluminum), .
  • Welding Positioning: For floor-mounted or ceiling-mounted trays, a bonding surface can be temporarily attached to the floor to improve welding convenience and stability .
  • Post-Weld Treatment: Smooth welds, remove slag, and apply surface treatment (painting or galvanization) to prevent corrosion .
  • Inspection: Verify weld quality, joint strength, and dimensional accuracy to meet safety and industry standards.
Material Considerations
  • Galvanized Steel: Common for indoor and outdoor installations; welding requires care to avoid zinc fumes.
  • Stainless Steel: Corrosion-resistant; TIG welding is preferred for clean, strong joints.
  • Aluminum: Lightweight and corrosion-resistant; requires TIG or MIG welding with proper shielding gas .
Summary
  • Riveting: Quick, modular, suitable for lighter loads, allows disassembly.
  • Welding: Permanent, strong, suitable for heavy-duty or high-stress applications, requires skilled labor and safety precautions.
  • Best Practice: Choose the method based on load requirements, material type, installation environment, and maintenance needs. Always follow safety standards and inspect joints for structural integrity .

Methods for riveting and welding cable tray elbows - RIVO MULTITRADE OPTICAL SYSTEMS [PDF]

Methods for riveting and welding cable tray elbows

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Technical note

This reference is intended for preliminary fiber optic splice closure research. Compatibility, splice capacity, sealing class, tray layout, protection sleeves, installation methods, test limits and applicable standards must be verified for the specific project.

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