Welding of steel structure cable tray supports

Steel cable tray supports are welded by temporarily securing the support, preparing bonding surfaces, and following proper welding and surface treatment standards to ensure structural integrity and corrosion resistance.

Welding Method

For steel cable tray supports, a bonding surface is typically formed on the lower part of the support to improve welding convenience. The process involves: Selecting the welding position on the floor or structural surface where the support will be installed. Temporarily attaching the support using clamps or fixtures to hold it in place, ensuring alignment and stability during welding.

Performing the welding along the prepared bonding surfaces, typically using standard steel welding techniques such as MIG, TIG, or arc welding, depending on the steel type and thickness. Temporary attachment ensures that the support remains correctly positioned and reduces the risk of misalignment or structural stress during welding.

Material and Surface Considerations

Supports are generally made from hot or cold-rolled mild steel sheets with thicknesses around 2. 5 mm for channel portions. After welding, galvanization is recommended to protect against corrosion.

Hot-dip galvanization with a zinc coating of at least 75 microns ensures durability in industrial environments. Pre-treatment of steel surfaces before galvanization is essential to ensure proper adhesion and uniform coating.

Installation and Safety Guidelines

Welding should be performed by competent personnel familiar with electrical installation and steel fabrication standards. Supports must be installed in accordance with BS EN 61537 for cable trays and BS 6946 for channel support systems, ensuring they can safely carry the weight of cables and imposed loads. Proper spacing, alignment, and stress-free cable dressing are critical to prevent mechanical strain on the cables.

Use of high-tensile bolts, washers, and nuts may be required for boltable sections, but welded supports provide a permanent and rigid solution.

Best Practices

Ensure all welding surfaces are clean and free of rust, oil, or paint before welding. Avoid welding in areas with excessive moisture to prevent hydrogen-induced cracking. After welding, inspect joints for structural integrity and uniformity.

If supports are pre-galvanized, avoid excessive grinding or cutting that may remove protective coatings; touch-up galvanization may be necessary. By following these methods, steel cable tray supports can be securely welded, providing a durable and safe framework for cable management in industrial, commercial, or offshore installations.