Product Specification

Stationary Spot Welder CNC Resistance Welding Machine for Aluminum Nut Welding

Precision Resistance Welding Solution for Automotive Manufacturing

This stationary projection spot welder is engineered to meet the rigorous demands of automotive production lines, delivering repeatable, high-strength welds on aluminum alloy sheets joined to nuts and bolts. The fixed-type frame with pneumatic actuation ensures stable electrode force and precise alignment, enabling consistent nugget formation across high-volume runs. Buyers can deploy the unit as a manually operated workstation or link it to robotic/CNC cells for fully automated fabrication.

Built around a water-cooled thyristor power source, the machine controls current, weld time, and clamping pressure with minimal deviation, reducing spatter and thermal distortion on aluminum workpieces. Models in this series accommodate low-carbon steel, stainless steel, and non-ferrous sheets, making the platform flexible for multi-material production. The integrated quick-response solenoid and adjustable strokes speed up electrode cycling, supporting cycle times required in automotive component assembly.

Key Technical Advantages

Automotive-Process Calibration

Current ramping and force profiles are pre-configured to handle aluminum nut projection welding without excessive splash, keeping weld appearance clean and mechanical strength at automotive specifications. Parameter presets simplify operator setup and reduce trial time for new parts.

Pneumatic Accuracy with Air Reservoir

A dedicated air storage tank stabilizes line pressure, so the upper electrode applies uniform clamping each cycle even if the shop air network fluctuates. Toolless stroke adjustments and lower-electrode height fine-tuning allow fast alignment of nuts to panels, cutting changeover time.

Rapid Cycling and Cushioned Action

A direct-acting solenoid valve shortens air path response, increasing cycles per minute while consuming less compressed air. Independent descent and ascent speed settings cushion the head, protecting soft aluminum surfaces from marking and lowering equipment noise.

Water-Cooled Thyristor Rectifier

The secondary circuit integrates a high-power, water-cooled thyristor module capable of delivering strong, steady current for continuous duty operation. Corrosion-resistant copper and stainless steel cooling paths with a visual flow gauge help maintenance staff confirm coolant circulation at a glance.

Insulated Secondary Circuit for Flexible Layout

Insulation on the upper secondary bushing isolates live parts reliably, allowing installation near grounded frames or other tooling without short-circuit risk. This also contributes to cleaner welding signals for harder-to-weld aluminum joints.

Simple Automation Interface

Standard electrical ports and a robust body structure make it feasible to connect the welder to a robot arm, sliding table, or indexing conveyor. Foot-pedal operation remains available for short runs, giving plants both manual and automated modes from one machine.

Applications

Working Principle

Technical Specifications

After-Sales and Support

• 1-Year Warranty — Free replacement of non-consumable parts if any defect appears under normal operating conditions within the coverage period.
• Installation & Training — On-site commissioning, calibration, and operator training on weld parameter setup are provided at your plant.
• Video Technical Support — Remote diagnostics and step-by-step video troubleshooting help for the life of the machine.
• Online Spare Parts Access — Common wear parts such as electrodes, solenoid valves, and seals are kept in stock for fast dispatch.

Frequently Asked Questions

Can this machine weld aluminum sheets without pre-cleaning?

Aluminum naturally forms an oxide layer that lowers weld quality, so we advise light degreasing or brushing of the contact zone. The machine’s pulse control helps break down oxide under pressure, but consistent pre-cleaning gives the most repeatable nuggets in production.

How is the electrode force adjusted?

The upper electrode is driven by pneumatic pressure. Regulators on the air line control the force level, and the built-in air reservoir buffers pressure changes to maintain equal clamping force from weld to weld.

Can the machine be integrated with an industrial robot?

Yes—the welder offers standard electrical interlocks and a stable frame, so most integrators can connect it to a robot arm or slide table using the I/O ports. We can recommend the correct model based on your electrode geometry and cycle time.

How do I choose between DN(B)-100 and DN(B)-250?

Selecting a size primarily depends on the combined material thickness and the projection area of your nut. The DN(B)-100 suits sheet stacks up to 3.0+3.0 mm, while the 250 model reaches 6.0+6.0 mm. Send us your workpiece drawings for a force/current calculation.

What maintenance does the cooling system require?

The flow indicator enables quick visual inspection; we recommend checking coolant flow daily and replacing the water every 6 months or when it becomes cloudy. The copper/stainless water paths resist scale build-up, but filtered water keeps the thyristor cooling effective.

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