Product Specification

Long Arm Stationary Spot Welder for 2mm Stainless Steel Sheet Metal

Product Overview

This long-arm stationary spot welder is a purpose-built evolution of our well-established DTN Series, tailored for fabricators who routinely join 2mm stainless steel thin sheets with deep recesses, box sections, or confined panel geometries. The extended throat and reinforced single-sided arm let operators reach weld points that fixed standard machines simply cannot access, making it a versatile addition to sheet metal job shops and production lines in the appliance, automotive component, and enclosure industries.

Beyond welding stainless steel, this fixed-type unit also handles low-carbon mild steel and selected non-ferrous alloys, supporting both conventional lap joining of sheet pairs and projection welding of sheet to nuts, bolts, or brackets. With a clean foot-switch interface, rigid frame structure, and dependable pneumatic force control, it is engineered to bring consistent nugget quality to high-volume batch runs while keeping operator fatigue low and changeover between workpiece variants simple.

Key Technical Advantages

Deep Throat for Recessed Join Points

The extended arm provides generous throat depth, letting operators place spots well inside long channels, stainless steel cabinets, and bracket-reinforced assemblies without rotating the whole workpiece or shifting to costly manual finishing.

Controlled Electrode Force on Thin Sheet

Auxiliary air-cylinder pressurization with electro-pneumatic proportional control enables fine, stepless adjustment of weld force. This translates to less indentation and marking on delicate stainless surfaces, while still delivering a firm, repeatable joint for quality-conscious buyers.

Millisecond Capacitor Discharge Heating

With capacitor-discharge technology, the heat is released in an extremely short window, which limits bulk heating of the workpiece. As a benefit for thin-gauge stainless, this reduces discoloration, part distortion, and the need for secondary cleanup between weld passes.

Fast Response Pneumatic Actuation

A combination cylinder with an aluminum barrel and low-resistance seals is paired with a pilot-operated high-flow solenoid valve. Operators benefit from quick follow-up motion and a tight cycling sequence, supporting higher part throughput in serial production environments.

Integrated Safety Monitoring Loop

Air and water pressure switches with alarm output prevent the unit from firing if coolant or pneumatic supply is outside safe thresholds. This protects consumables and tooling from premature wear, and gives production supervisors one less variable to police during long shifts.

Stable Output with Water-Cooled Transformer

A fully water-cooled welding transformer and rectifier keep the secondary circuit at a consistent temperature during sustained operation, delivering stable output that helps maintain nugget symmetry over the full duration of an 8-hour running window.

Applications

Working Principle

Technical Specifications

After-Sales and Support

• Warranty coverage — 12-month warranty against defects in materials and workmanship, with fast response for replacement parts during the coverage period.
• Remote troubleshooting — Video-based technical support and online assistance help your maintenance crew diagnose and resolve issues without waiting for an on-site visit.
• Spare parts availability — Free spare parts included with the machine, and long-term access to consumables such as electrodes, arms, and seals for continuous production.
• Installation and training — Field installation, commissioning, and operator training are available to shorten the learning curve and get the line running at full capacity sooner.
• Customization consultation — Our factory accepts custom throat lengths, electrode configurations, and control options, so you can order a machine matched to your specific part family.

Frequently Asked Questions

Can this machine weld 2mm stainless steel to thicker mild steel parts?

Yes, the unit can join stainless thin sheet to low-carbon steel up to the rated capacity of the selected model. However, for mixed-metal joints, we recommend a weld test with your exact material thickness and electrode geometry so our engineers can confirm the recommended current and force settings.

What maintenance does the long-arm spot welder need on a weekly basis?

Weekly attention to electrode tip dressing, water flow checks, and air-line moisture draining will keep joint quality stable. The open frame design makes these routine tasks straightforward, and our support team can share a simple preventive maintenance checklist during commissioning.

How do I choose between DN-40 and D(T)N-160 for my production?

The decision is driven by combined material thickness, duty cycle expectations, and available electrical supply. A DN-40 handles light 2mm sheet work comfortably, while higher-rated models like D(T)N-160 provide more weld force and current headroom for thicker stack-ups or faster repeat rates. Share your drawings and production volume, and our team will point you to the most economical fit.

Will the extended arm reduce weld quality compared to a standard short-arm machine?

No. The arm geometry changes the reach, not the fundamental pressure or current delivery. The frame and upper arm are dimensioned to keep deflection minimal at full electrode force, so spot consistency on the workpieces themselves remains on par with our standard-throat units of the same rating.

Can you customize the throat or arm length for a specific part?

Yes, custom throat depth and arm configurations are available on request. Send us a drawing of your workpiece and access limitations, and we will confirm the maximum reach we can build while keeping the tooling rigid and the weld cycle repeatable.

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