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TELWIN SUPERIOR TIG 251 DC 400V + ACC: precise welding for professionals and demanding users
TELWIN SUPERIOR TIG 251 DC 400V + ACC. (816116) is Italian welding engineering built for the most demanding professional work. This inverter welder for TIG DC and MMA answers the needs of specialists who accept no compromise on quality, precision and reliability. If you fight an unstable arc, have trouble welding thin material or need full control over the welding of carbon and stainless steel, titanium, copper or nickel, this model is made for you.
With a three phase 400V supply, the SUPERIOR TIG 251 DC delivers stable and strong power for demanding projects. The heart of the machine is a microprocessor that governs all welding parameters and gives repeatable settings and repeatable weld quality. Functions such as TIG Pulse and HF/LIFT arc striking allow precise welding of parts of different thickness, cut the risk of distortion and give a clean weld face. This is not only a tool, it is a partner in daily work that raises efficiency and brings results that were out of reach before.
The SUPERIOR TIG 251 DC model was designed for intensive use in hard industrial conditions. Solid construction, quality components and a set of protections (thermal, overvoltage, undervoltage, overcurrent) give long service life and failure free work. The accessories included (ACC.) make the machine ready to work almost straight after unpacking, which matters to professionals who value their time. Choosing the TELWIN SUPERIOR TIG 251 DC you invest in technology that translates into better weld quality, lower material consumption and shorter lead times. That is the choice of a master welder.
The advanced capabilities of the TELWIN SUPERIOR TIG 251 DC 400V + ACC.
Precision and control in TIG DC welding at the highest level
The TELWIN SUPERIOR TIG 251 DC stands for precision in TIG welding with direct current. The key here is the advanced microprocessor control, which allows exact setting and monitoring of all the main process parameters. Functions such as adjustable current rise and fall time (Slope Up/Down), start and end current setting (Start/End Current) and pre and post gas time (Pre/Post Gas) give the welder full control over every stage of the weld, from its start to the closing of the crater.
The TIG Pulse function is of particular importance. It allows welding with pulsed current, where peak current and base current alternate. Thanks to pulse frequency setting (Pulse Frequency) and pulse balance (Pulse Duty Cycle/Balance), the professional can control the heat input precisely. That is valuable when welding thin stainless steel sheet, titanium or other materials sensitive to distortion, because it gives deeper penetration at lower heat input per unit of length. The result is welds of very good quality, minimal distortion and clean appearance.
Reliability and efficiency in MMA mode
Although the TELWIN SUPERIOR TIG 251 DC is a TIG specialist, what it does in MMA welding (with a coated electrode) is equally solid. With 250A of output and advanced support functions, the machine handles electrodes up to 5.0 mm in diameter, rutile, basic and cellulosic ones included.
The Arc Force function raises the welding current dynamically at the moment the arc shortens, stops it from going out and makes welding in difficult positions easier. Hot Start gives a short rise of current at the start of welding, so the arc strikes easily even with cold or damp electrodes. Anti-Stick in turn reduces the current automatically when the electrode sticks to the material, protects it against overheating and makes it easier to pull free. These systems make MMA welding simpler, more stable and more effective, also for less experienced operators, while professionals will value the smoothness and control of the process.
Safety and durability for professional use
In the design of the SUPERIOR TIG 251 DC, Telwin put heavy weight on reliability and safety. The machine has a set of protections that guard both the welder and the operator. The thermostatic protection monitors the temperature of the main components and switches the machine off if it overheats. The overvoltage and undervoltage protections guard against mains voltage swings, a frequent problem in industrial conditions or when working from a generator. The overcurrent protection prevents damage caused by excessive current.
The solid metal housing with protection degree IP23 resists dust and splashing water, which allows work in varied conditions, outdoors as well (with suitable cover against direct rain). A quality fan and optimised air flow give effective cooling. All this translates into long machine life and a low risk of breakdown, which for a professional means work without stoppages and a safe investment for years.
Technical specification
| Parameter | Value |
|---|---|
| Catalogue number | 816116 |
| EAN code | 8004897917993 |
| Supply voltage | 400V (3-phase, 50/60Hz) |
| TIG DC welding current setting range | 5 - 250 A |
| TIG duty cycle (at ambient temp. 40°C) | 250 A @ 35% ; 180 A @ 60% ; 150 A @ 100% |
| MMA DC welding current setting range | 5 - 250 A |
| MMA duty cycle (at ambient temp. 40°C) | 250 A @ 35% ; 180 A @ 60% ; 150 A @ 100% |
| Open circuit voltage | 69 V (DC) |
| Maximum power input | 7 kW (TIG) / 9.4 kW (MMA) |
| Power input at 60% | 4.5 kW (TIG) / 5.6 kW (MMA) |
| Power factor (cosphi) | 0.9 |
| Coated electrode diameter (MMA) | 1.6 - 5.0 mm |
| Protection degree | IP23 |
| Dimensions (L x W x H) | 530 x 240 x 450 mm |
| Weight | 27 kg |
| TIG arc striking | LIFT / HF (high frequency) |
| Control | Microprocessor |
| Display | Digital |
Key features and benefits
- Advanced microprocessor control: The heart of the machine is a dedicated microprocessor that manages all welding parameters in real time. The system gives a very stable arc, repeatable settings and current characteristics matched to different materials and thicknesses. For the professional that means an easier way to a clean weld every time, fewer errors, faster setting of the right parameters and the option to save your own welding programs (depending on the submodel, including the Superior series in general).
- Versatile TIG DC welding with the PULSE function: The machine offers full control over the TIG DC process, the advanced pulse mode (PULS TIG) included. Setting the pulse frequency, the base current and the peak current allows welding of very thin material (<1mm) with minimal heat input, which cuts distortion sharply. The professional gains good control over the weld pool, the option to lay neat stacked welds and to weld materials sensitive to overheating with precision not available before.
- Double arc striking system (HF/LIFT): The TELWIN SUPERIOR TIG 251 DC offers a choice between contactless striking with high frequency (HF) and contact striking with LIFT. HF striking suits precise work where contamination of the electrode and the material has to be avoided, while LIFT is preferred in surroundings sensitive to electromagnetic interference. For the welder that means flexibility and the option to match the start method to the task, with a clean and sure start of welding in typical workshop conditions.
- Effective welding with a coated electrode (MMA): Besides TIG, the machine is a fully working MMA welder, with adjustable Arc Force (arc dynamics), Hot Start (easy striking) and Anti-Stick (protection against the electrode sticking). That allows effective welding with different types of electrodes (rutile, basic, cellulosic, stainless). For the professional it means one versatile machine for many tasks, saved space and saved cost, with no compromise on MMA weld quality.
- Complete protections and solid construction: The machine carries a number of protective systems: thermostatic, overvoltage, undervoltage, overcurrent and protection against overloading the generator. Together with the sturdy housing and quality components that gives long and failure free work even in demanding industrial conditions (protection degree IP23). For the user it means a safe investment, minimal downtime and safety of work at the highest level.
Applications
- Welding of precise stainless steel structures (railings, architectural parts, tanks).
- Production and repair in the food, chemical and pharmaceutical industry (pipelines, installations of acid resistant steel).
- Reconditioning and repair of machine parts made of high alloy steel, nickel and titanium.
- Welded joints under load in power engineering and shipbuilding (direct current DC).
- Repairs and modifications in car and motorcycle workshops (exhaust systems, frames, steel parts).
- General metalwork and workshop jobs that call for good quality TIG DC welds and effective MMA welding.
- Welding of thin sheet with minimal distortion thanks to the TIG Pulse function.
Summary: TELWIN SUPERIOR TIG 251 DC 400V + ACC. - your best investment
TELWIN SUPERIOR TIG 251 DC 400V + ACC. is not an ordinary welder, it is an investment in the precision, reliability and versatility that true professionals expect. Whether you work with stainless steel, with titanium or build complex structures, this model gives you the power and the control needed for a clean result. Forget compromises and join the group of experts who trust Telwin technology. Order today and raise the quality of your work to a master level.
Catalogue number: 816116
EAN code: 8004897917993
