New TECNA 4645N 16 kVA Rocker Arm Spot Welder

New TECNA 4645N 16kVA pneumatic rocker-arm spot welder for sale in Ireland. TE101 control, adjustable 380–700 mm reach and water cooling.

Heavy-Duty Pneumatic Resistance Spot Welder with Adjustable-Reach Arms and TE101 Control

The TECNA 4647N is a pedestal-mounted pneumatic rocker-arm spot welder designed for accurate and repeatable resistance spot welding in sheet-metal fabrication, general engineering and production environments.

The machine combines a 16 kVA nominal rating, adjustable-length welding arms, a maximum throat depth of approximately 550 mm, water-cooled welding components and TECNA’s TE101 microprocessor weld control.

Its extended-reach rocker-arm arrangement is particularly useful when welding larger panels, cabinets, enclosures and fabricated assemblies where greater access behind the electrode tips is required.

TECNA article number: 4645N

Main Features

• New TECNA industrial resistance spot welder
• 16 kVA nominal power at 50% duty cycle
• Pneumatic rocker-arm electrode operation
• Adjustable arm depth from approximately 230 to 550 mm
• TECNA TE101 microprocessor welding control
• Water-cooled transformer, arms and electrodes
• Adjustable electrode stroke
• Adjustable electrode force
• Heavy-duty chrome-copper electrode holders
• Electrode holders suitable for straight or angled installation
• Lubrication-free pneumatic cylinder
• Adjustable electrode opening and closing speeds
• Two-stage electric foot pedal
• Front-mounted control for clear operator visibility
• Ergonomic stationary pedestal construction
• Optional large-gap arm arrangement

TECNA lists the 4645N with 16 kVA nominal power, 35 kVA maximum welding power, 3.4 V no-load secondary voltage and 12.5 kA maximum short-circuit

Technical Specification

Manufacturer: TECNA

Article / model: 4645N

Machine condition: New

Machine type: Pneumatic rocker-arm spot welder

Welding process: AC resistance spot welding

Nominal power at 50% duty cycle: 16 kVA

Maximum welding power: 35 kVA

No-load secondary voltage: 3.4 V

Maximum short-circuit current: 12.5 kA

Maximum welding current on steel: 10. kA

Thermal current at 100%: 3.3 kA

Standard electrical supply: 400 V, 50 Hz

Delayed fuse at 380–415 V: 32 A

Delayed fuse at 220–240 V: 50 A

Suggested cable section up to 10 m: 6 mm²

Suggested cable section up to 30 m: 10 mm²

Electrical insulation: Class F

Compressed-air pressure: 6.5–10 bar

Air consumption per 1,000 welds: Approx 4.3 Nm³

Minimum throat depth: 230 mm

Maximum throat depth: 550 mm

Maximum electrode force at minimum reach: Approx. 240 daN at 6 bar

Maximum electrode force at maximum reach: Approx. 115 daN at 6 bar

Electrode stroke at minimum reach: 8-44 mm

Electrode stroke at maximum reach: 15–85 mm

Short-circuit current at maximum reach: Approx.8.8 kA

Cooling-water flow: Approx. 2.5 litres/minute

Minimum cooling-water pressure: 2.5 bar

Published noise level: Below 70 dB(A)

Net weight: 133 kg

Welding-arm diameter: 36 mm

Electrode-holder diameter: 19 mm

Electrode-cone diameter: 12.7 mm

Approximate overall height: 1,414 mm

Approximate cabinet depth: 694 mm

Approximate overall width: 408 mm

The detailed technical figures are taken from the manufacturer’s May 2024 specification table and dimensional drawing for article 4645N.

Pneumatic Rocker-Arm Operation

The TECNA 4645N uses a pneumatically operated rocker-arm mechanism to close the welding electrodes and apply the programmed clamping force.

This provides:

• Reduced operator effort
• Repeatable electrode pressure
• Adjustable opening and closing speed
• Consistent welding cycles
• Faster repetitive production
• Easier handling of larger components
• Better control than a mechanically operated pedal machine

The pneumatic cylinder operates without lubrication, helping prevent oil mist around the welding area. The system also incorporates manual condensate drainage, end-of-stroke cushioning and exhaust silencers.

Adjustable-Reach Welding Arms

The welding arms can be adjusted to suit different component depths.

The published working range for article 4645N is approximately:

• Minimum throat depth: 230 mm
• Maximum throat depth: 550 mm

This long-reach arrangement makes the machine useful for welding further into:

• Sheet-metal panels
• Cabinets
• Doors and access panels
• Electrical enclosures
• Ducting components
• Fabricated boxes
• Metal furniture
• Larger formed assemblies

As the arm reach increases, available welding current and electrode force reduce. At maximum reach, TECNA publishes an approximate short-circuit current of 8.4 kA and electrode force of Approx. 115 daN.

TECNA TE101 Microprocessor Control

The standard TECNA TE101 is a microprocessor-based controller for single-phase AC resistance welders.

It manages the machine’s welding sequence and controls the electronic devices responsible for regulating welding current. The control is mounted toward the front of the machine so that settings and welding information remain visible to the operator during production.

Published TE101 capabilities include:

• Integrated welding-current measurement
• 13 programmable welding parameters
• Storage for up to 99 welding programs
• Up to 31 programs recallable externally
• Welding-current control using programmed limits
• Upper and lower current limits
• Half-cycle welding-time control
• Minimum secondary-current compensation
• Single-weld and automatic operating modes
• Weld-quality monitoring
• Out-of-limit weld indication

The TE101 is suitable for both manually and pneumatically operated TECNA resistance welders.

Two-Stage Electric Foot Pedal

The pneumatic machine uses a two-stage electric foot pedal.

The pedal allows the operator to:

1. Close the electrodes and clamp the parts.
2. Confirm that the work is correctly positioned.
3. Initiate the welding current.

This separation between clamping and welding can improve positioning accuracy, operator control and production consistency.

The machine is also prepared for connection of an optional second two-stage pedal. This may be used to recall a second time-and-current setting where two different weld schedules are required on the same component.

Adjustable Electrode Force

Electrode force is adjusted using the pneumatic filter-regulator and pressure gauge.

At a published reference pressure of 6 bar, the approximate available force is:

• 240 daN at the minimum 230 mm throat depth
• 115 daN at the maximum 550 mm throat depth

The correct force depends on:

• Material type
• Combined sheet thickness
• Electrode-tip diameter
• Surface coating
• Welding current
• Weld time
• Arm reach

Actual production settings should be established through weld testing and inspection.Water-Cooled Welding Circuit

Water-Cooled Welding Circuit

The TECNA 4647N uses water cooling to control heat in the welding circuit during repeated operation.

Water-cooled components include:

• Epoxy-resin-encapsulated transformer
• Welding arms
• Electrode equipment

Cooling-water requirement of approximately:

• Flow: 2.5 litres per minute
• Minimum pressure: 2.5 bar

A suitable industrial water chiller or clean closed-loop cooling circuit may be required where an adequate cooling-water supply is unavailable.

Heavy-Duty Electrode Equipment

The electrode holders are manufactured from chrome-copper for heavy-duty use and extended service life.

They are designed to accept:

• Straight electrodes
• Offset electrodes
• Angled electrodes
• Bent electrodes
• Flat electrodes
• Swivel or special-purpose tips

Alternative arm and electrode configurations may be selected according to the shape and accessibility of the component being welded.

Welding Capacity

The manufacturer’s performance table lists an approximate maximum capacity for article 4645N of:

• 3 + 3 mm pickled mild-steel sheet
• 10 + 10 mm round bar

These figures are manufacturer performance references rather than guaranteed capacity for every application. Actual capability depends on throat depth, electrode shape, cooling, surface condition, electrical supply and weld schedule.

Typical Applications

The TECNA 4645N may be suitable for:

• General sheet-metal fabrication
• Mild-steel resistance spot welding
• Stainless-steel sheet assemblies
• Electrical cabinets and enclosures
• Metal doors and panels
• HVAC and ventilation products
• Commercial kitchen equipment
• Metal furniture and shelving
• Automotive and commercial-vehicle components
• Brackets and pressed parts
• Appliance components
• Agricultural equipment panels
• Repetitive production welding
• Maintenance and repair departments
• Fabricated boxes and housings
• Long-reach panel welding

Actual suitability must be established by testing the intended materials, coatings, thicknesses and component geometry.

Why Choose the TECNA 4645N?

The TECNA 4645N is a practical choice for businesses needing greater reach than a standard short-arm spot welder while retaining the flexibility of rocker-arm operation.

Its principal production benefits include:

• Adjustable reach up to approximately 550 mm
• Pneumatic electrode closure
• Adjustable electrode force
• Programmable TE101 weld control
• Water-cooled welding circuit
• Long-reach access into panels and enclosures
• Two-stage clamping and welding pedal
• Heavy-duty stationary construction
• Multiple weld-program storage
• Flexible electrode and arm options

It is especially suitable for fabrication businesses producing cabinets, panels, enclosures and larger sheet-metal assemblies.

Standard Equipment

The standard configuration is understood to include:

• TECNA TE101 microprocessor control
• Pneumatic rocker-arm operating system
• Two-stage electric foot pedal
• Adjustable-length welding arms
• Chrome-copper electrode holders
• Water-cooled transformer and welding circuit
• Pneumatic filter and regulator
• Air-pressure gauge
• Adjustable electrode opening and closing speed
• Emergency isolator
• Stationary pedestal cabinet

Final supplied equipment should be confirmed at the time of quotation.

Optional Equipment

Available options may include:

• Additional foot pedal for a second welding schedule
• Alternative straight, offset, angled or swivel electrodes
• Special electrode holders
• Reduced-section arms
• Adjustable large-gap arm assembly, article 4618
• Special arm lengths and configurations
• Closed-loop water chiller
• Application-specific fixtures or tooling

The optional large-gap assembly can provide an opening of up to approximately 440 mm. Increasing the arm gap reduces the welding current available at the electrodes.

Installation Requirements

Before installation, the purchaser should confirm:

• Available electrical supply and capacity
• Supply voltage and frequency
• Protective fuse or circuit-breaker rating
• Cable size and cable length
• Compressed-air pressure and quality
• Cooling-water flow, pressure and temperature
• Machine position and working clearance
• Floor condition and anchoring requirements
• Electrical isolation
• Guarding and workplace safety requirements

The standard configuration is a 400 V, 50 Hz supply, but different voltages and frequencies may be available by request.

Important Specification Notice

All specifications, dimensions, ratings, welding capacities, production rates and equipment descriptions are approximate and are provided for guidance only.

FAQ

What is the TECNA 4645N?

The TECNA 4645N is a stationary 16 kVA pneumatic rocker-arm resistance spot welder with adjustable-length arms and TE101 microprocessor control.

Is the TECNA 4645N foot operated or pneumatic?

The current TECNA product-page title refers to it as foot operated, but TECNA’s detailed May 2024 technical table categorises article 4645N as pneumatic. Its weld cycle is initiated through a two-stage electric foot pedal, while a pneumatic cylinder supplies the electrode movement and clamping force.

Is this an inverter spot welder?

No. The TECNA 4645N is a single-phase AC resistance spot welder with electronic microprocessor weld control. It is not a medium-frequency inverter machine.

What is its maximum throat depth?

The maximum published throat depth is approximately 550 mm.

Can the arm depth be adjusted?

Yes. The arms can be adjusted from approximately 230 to 550 mm.

What is the maximum electrode force?

The brochure lists approximately 240 daN at minimum reach and 115 daN at maximum reach, based on a 6 bar pneumatic supply.

What steel thickness can it weld?

The manufacturer lists an approximate maximum capacity of 3 + 3 mm pickled mild steel. Actual capacity depends on arm reach, electrode configuration, material, cooling and weld settings.

What control is fitted?

The standard machine is equipped with a TECNA TE101 microprocessor resistance-welding control.

How many welding programs can the TE101 store?

The TE101 can store up to 99 welding programs, with up to 31 programs externally recallable.

Does it need compressed air?

Yes. The published compressed-air range is approximately 6.5–10 bar.

Does it require water cooling?

Yes. The transformer, arms and electrodes are water cooled. The stated requirement is approximately 2.5 litres per minute at a minimum pressure of 2.5 bar.

What electrical supply does it require?

The standard brochure version is listed as 400 V, 50 Hz. At 380–415 V, the published delayed-fuse rating is approximately 32 A.

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