Rocker arm spot welders join overlapping metal components by applying pressure and electrical current through copper alloy electrodes. The resistance to electrical current generates heat at the interface of the metal parts, creating the weld.

Unlike a press-type spot welder, a rocker arm welder features an adjustable lower welding arm that remains stationary during the welding cycle and an upper arm that pivots, or “rocks,” into position to apply electrode force and complete the weld.

This proven design provides excellent access to the workpiece while allowing the welding arms and electrodes to be configured for a wide range of part sizes, shapes, and spot welding applications.

The machine clamps the workpieces between two electrodes and passes electrical current through the weld area. Electrical resistance generates heat between the metal surfaces while electrode force holds the parts together, forming a resistance spot weld.

A rocker arm welder applies force through a pivoting upper welding arm, while a press-type spot welder typically applies force in a straight vertical motion. Rocker arm welders provide excellent part accessibility and flexibility, while press-type welders are often selected for applications requiring higher electrode forces or projection welding.

Rocker arm resistance welders combine a simple, durable design with the flexibility needed for a wide range of industrial spot welding applications. Depending on the machine and configuration, benefits can include:

• Fast production speeds and repeatable weld cycles
• Consistent, high-quality resistance spot welds
• Adjustable welding arms for increased application flexibility
• Easy access to parts and weld locations
• Foot-operated or pneumatic operation
• Ergonomic designs that can help reduce operator fatigue
• Configurable weld controls, transformers, electrodes, and tooling
• Reliable operation with relatively simple maintenance
• Cost-effective solution for low- to medium-volume production

Yes. WSI rocker arm spot welders can be configured around the welding application with different power supplies, transformers, weld controls, welding arms, electrodes, tooling, fixtures, and other options.

WSI can evaluate your application and help determine the appropriate rocker arm welder, welding transformer, control, electrodes, and tooling for your production requirements.

Whether you need an IN-STOCK rocker arm spot welder for quick delivery, a TECNA rocker arm welder, or a custom resistance welding machine, Weld Systems Integrators can provide the equipment, engineering, parts, consumables, and technical support needed for your application.

Sheet Metal Fabrication – Spot welding sheet metal assemblies and fabricated components.

HVAC and Ductwork – Welding galvanized steel, stainless steel, and aluminized duct components and fittings.

Maintenance and Repair – General plant maintenance, repair shops, and low-volume fabrication.

Metal Enclosures and Cabinets – Joining sheet metal panels, housings, cabinets, and similar fabricated assemblies.

General Manufacturing – Stationary resistance spot welding where flexible throat depth and operator-controlled part positioning are required.

WSI and TECNA rocker arm spot welders can be configured to weld a variety of conductive metals, including mild steel, stainless steel, galvanized steel, aluminized steel, and certain non-ferrous metals. Weldability depends on the material, thickness, conductivity, electrode configuration, available weld current, and power supply. Materials such as aluminum and copper typically require higher current and application-specific machine configurations. Common weldable materials include:

• Mild steel / low-carbon steel — The most common and easiest material to weld. Used for sheet metal, brackets, cabinets, enclosures, wire products, and fabricated assemblies.
• Galvanized steel — Commonly spot welded, although the zinc coating requires different weld settings and can increase electrode wear.
• Stainless steel — Well suited to resistance spot welding because of its relatively high electrical resistance. Common in appliances, food equipment, medical products, and fabricated assemblies.
• High-strength steels — Many grades can be spot welded, but weld schedules and electrode force may need to be optimized for the specific alloy.
• Nickel and nickel alloys — Can be resistance welded in appropriate thicknesses and applications.
• Copper and copper alloys — More difficult because copper conducts heat and electricity extremely well. Specialized electrodes, higher current, and sometimes different resistance-welding equipment may be required.
• Aluminum and aluminum alloys — Possible, but considerably more demanding than steel. Aluminum typically requires very high current, short weld times, higher electrode forces, and equipment specifically sized for aluminum welding.

Selecting the right rocker arm spot welder depends on a number of variables, including the material being welded, material thickness, required weld force, throat depth, electrode configuration, production requirements, and available electrical power. The welder must provide enough welding current and electrode force to consistently produce a strong, repeatable weld for your specific application.

Key factors include:

• Material Type and Thickness: Determine the type of metal being welded and the combined thickness of the workpieces. Thicker materials typically require higher welding current and electrode force.
• Welding Capacity: Select a machine with sufficient kVA capacity and secondary welding current for your application.
• Throat Depth: Consider the distance from the edge of the part to the required weld location. The rocker arm length must provide enough reach to properly position the electrodes.
• Electrode Force: Proper electrode force is critical for consistent weld quality. Pneumatic rocker arm welders generally provide more consistent and adjustable force than manually operated models.
• Foot vs. Pneumatic Operation: Foot-operated welders are well suited for lighter-duty and lower-volume applications, while pneumatic welders can improve consistency, operator ergonomics, and production speed.
• Production Volume: Consider the number of welds per part and expected parts per shift. Higher-volume applications may require additional cooling, pneumatic operation, or a more robust resistance welding system.
• Electrical Requirements: Verify that the facility’s available voltage, phase, and electrical service are compatible with the welder.
• Part Geometry and Tooling: The size and shape of the component may require specific electrode arms, holders, tips, or custom tooling.

If you’re not sure which rocker arm spot welder you need, please provide WSI with your material type, material thickness, part drawings or photos, required weld locations, and estimated production volume. Our resistance welding specialists can help determine the appropriate welder size, kVA, throat depth, electrode force, controls, and tooling for your application.

Both AC and MFDC (Medium-Frequency Direct Current) power supplies can produce strong, repeatable resistance spot welds.

When to choose an AC rocker arm spot welder – AC rocker arm welder is often the best value for straightforward spot welding of mild steel and similar materials, especially in lower-production environments.

When to choose an MFDC rocker arm spot welder – MFDC rocker arm welder is better when the application requires greater process control, repeatability, shorter weld times, or more challenging materials.

AC = proven, economical, and ideal for general-purpose resistance spot welding.

MFDC = more precise, efficient, and controllable for demanding resistance welding applications.

WSI maintains rocker arm spot welders IN-STOCK at its Warrensville Heights, Ohio facility. Inventory varies, so availability should be confirmed when requesting a quote.

View our current IN-STOCK inventory