Welding of flat iron for vertical shaft cable trays

Welding flat iron supports for vertical shaft cable trays requires proper joint preparation, temporary positioning, and adherence to structural and safety standards to ensure stability and load-bearing capacity.Material and Support StructureFor vertical shaft cable trays, mild steel (MS) angles or flat iron are commonly used for support structures. Typical dimensions include 50 x 50 mm angles with 6 mm thickness for wall-mounted supports and C-channels of 150 x 75 mm with 5.7 mm thickness for bridging longer spans . The supports must be fabricated to match the cable tray layout and installed at regular intervals (commonly 1 meter) to maintain structural integrity .Welding PreparationJoint Surface Formation: Create a flat, clean bonding surface on the lower part of the support to facilitate welding .Temporary Attachment: Before welding, temporarily attach the support to the floor or existing structure using clamps or fixtures to ensure correct alignment and prevent movement during welding .Surface Cleaning: Remove rust, paint, or galvanization at the welding points to ensure proper fusion and avoid weak joints .Welding ProcedurePositioning: Select the exact welding position according to the cable tray layout and structural drawings .Welding Method: Use standard arc welding or MIG welding suitable for mild steel. Ensure full penetration welds for load-bearing joints.Sequence: Weld supports sequentially, starting from the base and moving upward, to maintain vertical alignment and prevent distortion .Post-Weld Treatment: Apply primer and enamel paint (e.g., Siemens grey) to welded areas to prevent corrosion and maintain a smooth finish .Installation ConsiderationsLoad Capacity: Supports must withstand the weight of the cable tray, cables, and any imposed loads such as wind or maintenance activities .Isolation: Use insulating materials like G-10 sheets at each support to prevent electrical conduction between the tray and the structure .Hardware: Use high-tensile bolts, washers, and nuts (e.g., M8) for connecting cable tray sections and coupler plates .Bends and Routing: Fabricate bends with adequate radius to avoid cable damage and maintain proper cable management .Safety and ComplianceEnsure all welding and installation work is performed by competent personnel familiar with electrical installation safety standards .Follow relevant standards such as BS EN 61537 for cable tray systems and BS 6946 for channel supports .Verify that the welded structure maintains mechanical stability and does not compromise cable integrity or accessibility. By following these steps, welding flat iron supports for vertical shaft cable trays can be performed efficiently, safely, and in compliance with industry standards, ensuring long-term reliability of the cable management system.