Cable tray supports in steel structures should be welded using approved procedures, with proper positioning, temporary attachment, and post-weld finishing to ensure safety and structural integrity.

Welding Method and Positioning

Cable tray supports are typically welded to steel structures at predetermined positions along the cable routing path. The process begins with selecting the welding position and temporarily attaching the support to the floor or structure using a bonding surface or clamps to maintain alignment and stability during welding . This ensures that the support remains plumb and level, preventing misalignment of the cable tray system .

Welding Procedure

Welding should be performed according to an approved Welding Procedure Specification (WPS), which defines the type of weld, electrode, current, and other parameters . For coated or galvanized steel, additional care is required to remove coatings at the weld site to prevent defects and ensure proper fusion . After welding, touch-up painting is recommended to protect exposed steel surfaces from corrosion .

Support Spacing and Installation

Supports should be spaced according to the load requirements of the cable tray system, typically within 2 feet (600 mm) of expansion splice plates and at quarter points of horizontal spans . Vertical trays require secure fastening methods beyond friction, and expansion guides should be used where necessary. All supports must be rigidly secured to the steel structure to maintain stability under load .

Safety and Preparation

Before welding, all tools, consumables, and materials must be inspected and approved by a supervisor or safety engineer. Proper personal protective equipment (PPE) and fire safety measures should be in place, especially when welding near flammable materials or fireproofed structures . Temporary attachment methods, such as clamps or bonding surfaces, improve convenience and reduce the need for multiple workers to hold supports during welding .

Post-Weld Considerations

After welding, ensure that all welds are inspected for quality and compliance with standards. Any cutting, drilling, or grinding edges should be painted or coated to prevent corrosion. Supports attached to fireproofed structures should account for the thickness of fireproofing material to maintain proper clearance . By following these procedures, welding cable tray supports in steel structure workshops can be performed efficiently, safely, and in compliance with structural and electrical standards .