Precision Long Arm Spot Welding for Extended-Reach Applications
The Xinwei DTN Long Arm Spot Welding Machine is purpose-engineered for manufacturers who need reliable, repeatable resistance welding on workpieces that standard machines cannot reach. Designed as an extended-arm variant of our proven DTN Series Stationary Projection/Spot Welders, this machine solves the core challenge of welding deep-draw, oversized, or irregularly shaped components — such as fan guards, wire cages, enclosures, and structural frames — without repositioning or manual intervention.
Key Technical Advantages
Extended Arm Geometry — Reach Where Others Cannot
The customized long arm design allows welding electrodes to access deep cavities and wide-span workpieces. For fan guard and cage manufacturers, this means single-pass welding of multiple connection points without flipping or rotating the part — reducing cycle time and eliminating alignment errors caused by re-handling.
Pneumatic Pressure Control — Consistent Weld Quality at Scale
The pneumatic electrode force system delivers uniform, adjustable pressure across every weld cycle. Unlike manual or spring-loaded systems, pneumatic control ensures the same squeeze force on every joint, directly translating to consistent nugget formation and predictable weld strength across high-volume production runs.
Broad Material Compatibility
The DTN Long Arm handles low-carbon steel, stainless steel, and select non-ferrous metals including aluminum. For manufacturers producing mixed-material assemblies — such as steel fan guards with aluminum hubs — this versatility eliminates the need for separate welding stations, reducing capital investment and floor space requirements.
Dual-Mode Operation: Spot + Projection Welding
The machine supports both standard spot welding (sheet-to-sheet) and projection welding (sheet-to-nut, sheet-to-bolt). This dual capability means a single machine can handle both structural assembly and fastener integration — consolidating two processes into one workstation.
Applications
| Industry |
Typical Workpiece |
Material |
| HVAC and Ventilation |
Fan guards, air grilles, ventilation cages |
Low-carbon steel, aluminum |
| Automotive Components |
Seat frames, bracket assemblies, heat shields |
Stainless steel, mild steel |
| Appliance Manufacturing |
Washer/dryer drums, oven racks, microwave enclosures |
Steel wire, sheet metal |
| Industrial Shelving and Storage |
Wire cages, rack systems, display fixtures |
Steel rod, wire mesh |
| General Fabrication |
Custom frames, enclosures, structural assemblies |
Mild steel, stainless steel |
Working Principle
The DTN Long Arm Spot Welder operates on the resistance welding principle: high-current electricity passes through copper electrodes into the workpiece, generating localized heat at the material interface due to electrical resistance. When the material reaches its plastic state, pneumatic pressure forges the joint, creating a solid-state metallurgical bond without filler metal. The extended arm maintains precise electrode alignment over the full reach distance, ensuring current delivery and pressure remain consistent regardless of weld position along the arm span.
Technical Specifications
| Parameter |
DN-40 |
DN-63 |
D(T)N-80 |
D(T)N-100 |
D(T)N-125 |
D(T)N-160 |
D(T)N-200 |
| Rated Power @50% (KVA) |
40 |
63 |
80 |
100 |
125 |
160 |
200 |
| Rated Primary Voltage (V) |
380 |
| Dimensions (mm) |
900 x 1700 x 2100 |
| Weight (kg) |
550 |
| Rated Duty Cycle |
50% |
After-Sales and Support
- Free Spare Parts — Critical wear components included for first-year operation
- Field Installation — On-site setup and commissioning by Xinwei engineers
- Operator Training — Hands-on training for your production team
- Video Technical Support — Remote diagnostics and troubleshooting
- 1-Year Core Component Warranty
Frequently Asked Questions
What is the maximum arm reach available?
The DTN Long Arm series supports customized arm lengths based on your workpiece dimensions. Contact us with your specific reach requirement for a tailored solution.
Can this machine weld aluminum to steel?
Resistance welding of aluminum to steel (dissimilar metals) is challenging due to differing melting points and the formation of brittle intermetallic compounds. We recommend discussing your specific material combination with our engineering team for feasibility analysis.
What tooling is included?
Each machine ships with one set of standard copper electrodes. Custom electrode geometries for your specific workpiece can be designed and manufactured by our in-house tooling team.
How do you ensure weld quality consistency?
Our pneumatic control system combined with precision-machined electrode holders ensures consistent electrode force and alignment. Each machine undergoes weld-sample testing before shipment, with documented parameter settings for your reference materials.
Request Your Welding Solution
Send us your workpiece drawings or samples for a free welding feasibility test. Our engineering team will evaluate your application and recommend the optimal DTN Long Arm configuration, including electrode design, arm length, and power rating.
Send Drawing | Request Welding Test | Get Solution
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