Product Specification

Stationary Spot Welding Machine 40 200 KVA Resistance Seam and Projection Welder

Product Overview

The DTN Series Stationary Spot Welder is a dual-purpose resistance welding unit engineered to handle both spot and projection joining tasks in demanding fabrication environments. Built for sheet metal workshops and fastener assembly lines, this machine delivers repeatable nugget quality on low-carbon steel, stainless steel, and non-ferrous alloys ranging from 2.5+2.5 mm up to 6+6 mm A3 steel thickness.

With a rated capacity spanning 40 to 200 KVA across seven interchangeable models, this floor-mounted welder supports everything from simple lap joints between panels to reliable projection welds between sheets and threaded components such as nuts and studs. The integrated pneumatic pressure system and thyristor-controlled power section make it a practical choice for manufacturers seeking consistent output without excessive energy consumption or operator fatigue.

Key Technical Advantages

Precision Pneumatic Pressure Control

An air cylinder pressurizes the upper electrode with finely adjustable force, while a built-in air reservoir compensates for supply line fluctuations. This design guarantees every cycle maintains the same clamping load, which is essential for producing uniform weld spots across long production runs.

Adjustable Stroke for Variable Workpiece Heights

Both the working stroke and auxiliary stroke are infinitely adjustable, and the lower electrode height can be repositioned vertically. This flexibility lets operators switch quickly between thin panels and thicker assemblies without mechanical reconfiguration or extended downtime.

Rapid Response with Reduced Air Usage

The direct-acting solenoid valve shortens the time between pedal activation and electrode contact, boosting cycle speed on high-volume tasks. The optimized air circuit also cuts compressed air consumption, lowering operating costs compared to conventional systems.

Controlled Cushioning for Surface Protection

Independent adjustment of descent and ascent speeds cushions the impact of the pressure head, reducing the risk of marking or deforming the workpiece surface. This same feature keeps operational noise levels lower, creating a more comfortable environment for the operator.

Dependable Upper Insulation Architecture

The secondary circuit employs an upper insulation layout that delivers reliable isolation and simplifies installation. This configuration minimizes the chance of short circuits and allows the machine to be positioned safely in a range of plant layouts.

Water-Cooled Thyristor Power Delivery

A water-cooled high-power thyristor module feeds the welding transformer, maintaining steady current output even during continuous shifts. Efficient cooling ensures the unit can operate at high duty cycles without overheating or degrading weld quality.

Applications

Working Principle

Technical Specifications

After-Sales and Support

• 1-Year Warranty — Full coverage on electrical components and mechanical structure against manufacturing defects.
• Technical Documentation — Complete operation manual, wiring diagram, and maintenance schedule provided with each shipment.
• Overseas Installation Guidance — Remote video support or on-site supervision available for production line startup.
• Fast Spare Parts Supply — Electrodes, valves, thyristor modules shipped within 3-5 working days for warranty and after-sales orders.

Frequently Asked Questions

What is the difference between the DN and DTN models in this series?

The DN-40 and DN-63 models are configured for spot welding only, while the D(T)N-80 through D(T)N-200 models include a projection clamping plate and are designed to handle both spot and projection welding applications. This allows you to choose the frame size that matches your required welding capacity.

Which material thickness can this machine handle?

The welding capacity for A3 mild steel ranges from 2.5+2.5 mm on the DN-40 up to 6+6 mm on the D(T)N-200 model. For stainless steel and non-ferrous metals, capacity will vary based on material conductivity and the specific electrode configuration used.

Can the electrode force be adjusted during operation?

Yes. The pneumatic system includes an air pressure regulator that allows you to adjust the electrode force in real time. This is useful for handling workpieces with different thicknesses without stopping the production line.

What is the required air supply pressure?

The machine operates with a standard factory air supply at 4-6 bar. An internal air reservoir helps stabilize pressure variations, and we recommend installing a filter-regulator-lubricator unit at the inlet for consistent performance and longer pneumatic component life.

Do you offer custom electrode designs for specific workpieces?

Yes. Send us your workpiece drawings and production specifications, and our engineering team will design the appropriate electrode geometry, contact tip size, and cooling channels. Custom arms and clamping plates are also available for special applications.

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