Production Method of Galvanized Cable Trays

Galvanized cable trays are manufactured by forming metal sheets into tray shapes, followed by surface treatment with zinc through hot-dip or other galvanization methods to ensure corrosion resistance.

Material Preparation

Cable trays are predominantly made from steel or stainless steel sheets and coils, with aluminum used in some cases for enhanced corrosion resistance. The metal coils are first slit and trimmed to ensure compatibility with automated forming machines, and then loaded onto a de-coiler for processing .

Forming Process

The metal strips are fed into a cable tray roll forming machine, which uses a series of progressive dies and rollers to bend, cut, and punch the metal into the desired tray configuration. Types of trays include ladder, solid bottom, perforated, and trough designs, each suited for specific cable management needs . Advanced machines may include automatic welding, embossing, and cutting stations for complex designs and high-volume production .

Galvanization

Once formed, trays undergo galvanization to protect against corrosion. Common methods include:

• Hot-Dip Galvanizing: Trays are immersed in molten zinc at approximately 450°C, coating all surfaces evenly. The zinc layer thickness is typically 65–85 micrometers for heavy-duty applications, checked with magnetic tools to ensure durability .
• Zinc Plating or Spray Coating: Alternative methods include cold zinc dipping, nickel-zinc plating, or powder coating, depending on environmental exposure and design requirements . Galvanization provides smooth edges, corrosion resistance, and structural rigidity, reducing installation time and eliminating the need for additional hardware .

Quality Control

After galvanization, trays undergo strict quality checks:

• Coating Thickness: Ensures proper corrosion protection without brittleness .
• Load Testing: Trays are tested with weights up to 1.5 times the expected load to verify strength .
• Traceability: Each batch is assigned a heat number to track the steel composition and ensure compliance with safety standards .
• Visual Inspection: Checks for smooth edges, uniform coating, and absence of defects .

Final Considerations

Galvanized cable trays are designed for durability, easy installation, and adaptability to complex architectural layouts. They are widely used in industrial, commercial, and infrastructure projects to safely route electrical cables while minimizing maintenance and corrosion risks .