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Welding of African-style trough-type cable trays

Fiber optic adapter knowledge brief Published 21 Oct 2022

Prepared for preliminary research by the DANI ALONSO OPTICAL knowledge desk. Confirm connector interfaces, sleeve materials, polish, loss budgets and installation requirements against current standards and product documentation.

Welding of African-style trough-type cable trays requires careful material selection, proper joint preparation, and adherence to safety and structural standards to ensure durability and cable protection.Overview of Trough-Type Cable Trays

Trough-type cable trays are designed to provide medium ventilation and protection for electrical cables, balancing airflow with safety. They are commonly used in industrial and commercial installations where cables need support but also require some protection from environmental factors and mechanical damage . These trays can be fabricated from mild steel, stainless steel, or aluminum, depending on the installation environment and corrosion resistance requirements .

Material Considerations
  • Mild Steel: Economical and strong, but requires galvanization or protective coating to prevent corrosion in humid or coastal regions.
  • Stainless Steel (AISI 316L): Offers high corrosion resistance, especially in chemically aggressive environments, and is suitable for outdoor or industrial installations .
  • Aluminum: Lightweight and corrosion-resistant, ideal for installations where weight reduction is important, though welding requires specialized techniques to avoid warping .
Welding Techniques
  1. Joint Preparation: Ensure edges are clean, free of rust, paint, or oil. Cut sections accurately to maintain alignment.
  2. Welding Methods:
    • MIG (Metal Inert Gas) Welding: Common for steel and aluminum trays; provides strong, clean welds suitable for structural support .
    • TIG (Tungsten Inert Gas) Welding: Preferred for stainless steel and aluminum; allows precise control and minimal distortion .
    • Spot Welding: Can be used for thin sheet metal trays but may not provide sufficient strength for heavy cable loads.
  3. Weld Placement: Focus on tray joints, bends, and support brackets. Ensure continuous welds at load-bearing points to maintain structural integrity.
  4. Post-Weld Treatment: For steel trays, apply anti-corrosion coatings or galvanization. Stainless steel may require passivation to restore corrosion resistance .
Installation and Safety Considerations
  • Maintain proper alignment of tray sections to prevent stress points.
  • Avoid overheating during welding to prevent warping or weakening of the tray.
  • Ensure electrical grounding of welded trays to comply with safety standards.
  • Follow local electrical codes and standards (e.g., NEMA, IEC) for cable tray installation and welding practices .
Summary

Welding African-style trough-type cable trays involves selecting the right material, preparing joints carefully, using appropriate welding techniques (MIG or TIG), and applying post-weld treatments to ensure durability. Proper installation and adherence to safety standards are essential to maintain structural integrity and protect the cables over the long term .

Welding of African-style trough-type cable trays - DANI ALONSO OPTICAL CONNECTIVITY [PDF]

Welding of African-style trough-type cable trays

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