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Copper components manufactured to drawing for industrial systems.
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Copper Terminals, Connectors and Braids
Made-to-drawing components for high-current conduction in industrial equipment, considering current, heating, movement, cooling, mounting and environmental conditions.
Itametais manufactures rigid and flexible copper connectors, assemblies with stranded conductors, and cast or forged terminals. Solutions are defined for the electrical, thermal, mechanical and dimensional requirements of each application, including special copper terminals weighing up to 1,500 kg per unit, subject to technical feasibility assessment.
01 / 08Different components within one solution
A stranded copper conductor is a flexible element made from multiple copper wires gathered and stranded together. A copper braid uses interwoven wires, usually in a flat or tubular construction, while a laminated connector combines stacked copper sheets or foils.
A copper terminal provides the electrical and mechanical interface with busbars, transformers, electrode arms or other equipment. A connector is the rigid or flexible assembly that links electrical components; a complete flexible connector may combine one or more conductors, terminals, insulation, hoses, fittings and protective coverings.
Solutions for high-current conduction
High-current connectors can link transformers, busbars, electrode arms and holders, rectifiers, welding equipment, power systems and industrial machinery.
In flexible assemblies, the construction may accommodate intended movement, thermal expansion and vibration, reduce forces transferred to rigid connections and adapt to the equipment geometry. These effects depend on sizing, actual movement and installation.
Manufactured configurations
Configuration is defined according to current, duty cycle, required flexibility, movement, available space, temperature, cooling, environment and mounting interface. The alternatives are not automatically suited to the same conditions.
- Flexible copper ropes and flat copper braids.
- Laminated copper connectors and assemblies with multiple stranded conductors.
- Rigid and flexible copper connectors.
- Insulated and non-insulated connectors.
- Air-cooled and water-cooled high-current connectors.
- Copper terminals with special geometries.
- Custom-engineered assemblies made to drawing or manufactured from samples.
Conductors, materials and coatings
According to the specification, Itametais works with electrolytic copper, Cu-ETP, oxygen-free copper and special copper alloys. Conductors may be bare or tin-plated; conductors and surfaces may receive a silver coating when technically applicable.
Tin and silver are treated as surface coatings rather than independent alloys. Selection considers electrical conductivity, mechanical strength, temperature, joining process, environment, oxidation, contact area, surface protection and compatibility with connected components.
Cast and forged copper terminals
The terminal forms part of the current path and also transfers loads to the assembly. Its design may consider contact area, current distribution, hole pattern, geometry, thickness, mechanical strength, surface finish, conductor joint, fastening and, when applicable, water inlet and outlet.
Itametais manufactures cast copper terminals and forged copper terminals to drawings or samples, including special geometries and hole patterns, with machining and finishing to specification.
Large copper terminals — up to 1,500 kg per unit
Itametais can manufacture copper terminals weighing up to 1,500 kg per unit. This capacity applies specifically to the terminal, not to the stranded conductor or the total weight of a complete connector.
Feasibility depends on geometry, material, manufacturing process, machining, tolerances and the project’s technical requirements.
Complete connector manufacturing
Itametais purchases the copper braids or flexible conductors according to the project specification, then manufactures and assembles the complete connector. The work is more than resale of a finished assembly and does not imply that Itametais makes the individual wires or produces the braid from raw material.
- Selection of the conductor and manufacture of the terminals.
- End preparation, assembly and joining of terminal and conductor.
- Machining and finishing.
- Installation of hoses, fittings and protective coverings when specified.
- Applicable inspection and testing.
Joining processes
Terminals and conductors may be joined by pressing or compression, welding, brazing, metal filling or consolidation, or a combination of processes when technically applicable.
Selection considers material, electrical cross-section, geometry, current, temperature, flexibility, mechanical loads, cooling, environment and customer requirements. No process is universally superior to the others.
Water-cooled high-current connectors
Water-cooled assemblies may incorporate terminals with internal channels, flow passages, water inlet and outlet, hoses, fittings, rotary joints, thermal or abrasion protection, and conductors arranged to the drawing or sample.
Design must consider water flow, pressure, temperature and quality, flow distribution, pressure loss, sealing, channel geometry, movement, torsion, radiant heat, abrasion and possible blockage. Cooling does not remove the need for correct sizing, inspection and maintenance.
Connectors without an internal water circuit
Assemblies may also dissipate heat without an internal water circuit and are sized according to current, conductor cross-section, duty cycle and heat-dissipation conditions. The application may use air cooling when expressly included in the design.
Insulation and protection
Connectors may be insulated or non-insulated and may receive protection against abrasion, radiant heat or metal spatter for demanding industrial environments.
Insulation and protection materials are defined according to application conditions and customer requirements, without assuming a universal rating or temperature limit.
Engineering and technical support
Technical support may start from a drawing, sample or application data. Any resizing or improvement is subject to technical assessment and customer approval.
- Made-to-drawing manufacturing, development from samples and reverse engineering.
- Electrical sizing, thermal analysis and electrical simulation.
- Cooling-circuit simulation.
- Assembly analysis and assessment of movement.
- Resizing and improvement of existing designs.
- Recovery of used connectors.
- Adaptation of terminals, conductors, hoses and protective coverings.
Factors that influence performance
Assembly behavior depends on the combination of electrical, thermal, mechanical and environmental requirements. Assessment may consider:
- Rated current and peaks, continuous or cyclic duty, AC or DC current, and frequency.
- Effective cross-section, length, electrical resistance and allowable temperature rise.
- Conductor construction, bend radius, movement frequency, flexing and torsion.
- Terminal contact area, joint quality, tightening and mounting.
- Cooling, ambient temperature, radiant heat, abrasion, dust and metal spatter.
- Water quality when a cooling circuit is present.
Cross-section and operating limits must be sized for the project; a generic current density does not apply to every configuration.
Quality control
According to applicability, technical specification and contracted requirements, the inspection plan may include:
- Chemical composition analysis and electrical conductivity measurement.
- Electrical resistance measurement in micro-ohms.
- Dimensional inspection and report.
- Liquid penetrant and ultrasonic testing.
- Hydrostatic, leak and flow testing for assemblies with a water circuit, when specified.
- Material certificate, identification and traceability.
Controls vary with the product and contract. Hydraulic tests are not presented as mandatory for connectors without a water circuit.
Proven experience with industrial connectors
More than 200 connectors have been supplied for industrial applications, with configurations developed to drawings, samples and specific operating requirements. This experience does not replace assessment of each new project or constitute a performance guarantee.
Recovery and refurbishment
Itametais also assesses used connectors. Recovery depends on technical inspection and the condition of each assembly.
- Inspection, disassembly and cleaning.
- Recovery or replacement of terminals.
- Replacement of conductors, hoses and fittings.
- Renewal of protective coverings and applicable repairs.
- Reassembly and final tests specified for the project.
Factors associated with premature failure
Sizing, installation, environment and maintenance influence assembly reliability. Factors requiring attention include:
- Inadequate cross-section, high joint resistance, or contaminated and oxidized contact surfaces.
- Incorrect tightening and excessive heating.
- Concentrated flexing near the terminal, inadequate bend radius or torsion.
- Wire fatigue and progressive conductor breakage.
- Abrasion, radiant heat, metal spatter and insulation damage.
- Leaks, restricted flow or blocked channels in cooled assemblies.
- Incorrect installation or movement different from that considered in the design.
Potential benefits
When correctly sized, copper connectors may support high-current conduction, accommodate movement and thermal expansion, reduce forces transferred to rigid components and match the equipment geometry.
Made-to-drawing engineering also allows cooling, special terminals, assembly recovery, environmental protection and electrical and dimensional controls to be assessed. Results depend on operating conditions and technical evaluation.
Applications and industries
Each connector must be specified for its application and duty. Solutions may be assessed for the following industries and equipment:
- Steelmaking, ferroalloys, mining and metallurgy.
- Electric arc, ladle and submerged-arc reduction furnaces.
- Industrial transformers, electrode arms and holders, and busbars.
- Rectifiers, electrolytic cells and induction systems.
- Welding equipment and resistance welding machines.
- Power generation, distribution and industrial grounding.
- Special machinery and equipment exposed to high currents.
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