Characteristics of Copper Steel Composite Plate Conductive Cross Arm

The arm body of the electrode arm adopts a rectangular cross-section cavity structure, and a core tube and a rib plate are set inside to strengthen the support. The outer copper plate of the copper-steel composite plate cross arms is conductive, and the steel plate provides mechanical support, and a closed square box structure is formed by welding.
The all-aluminum alloy profile conductive cross arms adopts a one-time extrusion molding process. The core tube and the surrounding plates are connected by rib plates, and a copper-aluminum composite plate is set at the front end to connect the electrode chuck.

The traditional type uses T2 copper and Q235 steel plate composite, with a copper layer thickness of 3-8mm and a steel plate thickness of 10-20mm. The 2024 innovative all-aluminum alloy cross arm uses 6063-T5 aluminum alloy, with a conductivity of ≥55%IACS and a tensile strength of ≥240MPa.
The composite plate is prepared by explosive welding or hot rolling composite process, and the interface shear strength is ≥100MPa.

Five independent cooling water channels are set inside the conductive cross arms: two water channels for cooling the copper chuck and the water-cooling ring are formed above the core tube, and the three channels below constitute the main circulation cooling system. The cooling water flow rate is 3-20m³/h, the water inlet temperature is ≤35℃, the pressure is 0.3-0.5MPa, and the high temperature resistant sealing ring is used to ensure the sealing.

Integrated cylinder driven clamping mechanism, the clamping force can reach 50-200kN. The copper-aluminum composite transition plate (3mm copper layer + 10mm aluminum base layer) realizes the low resistance connection between the aluminum alloy electrode arm and the copper chuck, and the contact resistance is ≤0.5μΩ·m².

After the conductive cross arms was applied to the 10t electric arc furnace of Shaanxi Steel Plant, the electrode consumption was reduced by 18%, saving 1.5 million RMB annually;
The power consumption of the electrode arm of the 30t furnace of Chengdu Metallurgical Experimental Plant decreased by 6.5%-12.7%, with an annual economic benefit of more than 2.1 million RMB;
In 2023, the improved copper steel composite plate conductive cross arm will be interchangeable for the left and right sides of the 50t electric arc furnace, reducing the spare parts reserve by 50% and reducing the single maintenance cost by 230,000 RMB.

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