Telwin Superior TIG 251 DC Pulse TIG Welder

Name: Telwin Superior TIG 251 DC Pulse TIG Welder – Datasheet
Brand: Telwin
SKU: 816116

Three-phase pulse TIG inverter with MMA and tack-weld functions

The Telwin SUPERIOR TIG 251 DC (code 816116, supplied with TIG accessories) is a direct-current inverter for TIG welding with HF or LIFT arc striking, pulse TIG and MMA. It delivers 10 to 250 A from a three-phase 400 V supply, and Telwin lists it for steel, stainless steel, titanium, copper, nickel and their alloys.

Besides standard TIG, the machine offers PULSE and EASY PULSE operation and a THINSPOT function for quick, precise tack welding of thin sheet. A VRD device is built in for safer working in damp environments, and the machine has connectors for remote control and for a G.R.A. water-cooling unit.

Technical specifications

Parameter	Specification
Manufacturer / code	Telwin / 816116 SUPERIOR TIG 251 DC + ACC.
Processes	TIG DC (HF or LIFT strike), pulse and EASY PULSE TIG, THINSPOT tack welding, MMA
Mains supply	3-phase 400 V, 50/60 Hz
Current range DC	10 – 250 A
Maximum current (EN 60974-1)	230 A at 20%
Duty cycle	150 A at 35%; 115 A at 60%
Maximum no-load voltage DC	101 V
Absorbed current	12 A maximum; 6 A at 60%
Absorbed power	7.5 kW maximum; 3.3 kW at 60%
Mains fuse	10 A
Efficiency / power factor	85% / 0.8
Usable electrodes DC	1.6 – 5 mm
Insulation class / protection	F / IP23
Dimensions L x W x H	43 x 17.5 x 34 cm
Weight	16.4 kg
Supplied with	TIG welding accessories (kit ST26, code 802788)
Machine without accessories	816029 SUPERIOR TIG 251 DC
Optional remote controls	RC-20 10 m with 2 potentiometers (802336); foot remote control 14 poles (802017); remote device (802810)
Optional trolleys	ARCTIC (803059); AMERICA (803084)

TIG and MMA settings

The TIG controls include bi-level current, start-up and end current, spot welding time, pre- and post-gas, up and down slope, DC balance and square-wave frequency. In MMA mode the machine provides arc force and hot start adjustment, with an anti-stick device, and it handles electrodes from 1.6 to 5 mm. Protections listed by Telwin cover thermal overload, over- and undervoltage, overcurrent and the water cooling unit.

The duty cycle is a useful guide for planning: 150 A at 35%, 115 A at 60%, and a maximum of 230 A at 20% under EN 60974-1. Continuous TIG work on thicker sections should therefore be planned around the 60% value, or around an external water cooling unit if the torch is water-cooled.

Choosing accessories and configuration

The kit version includes the ST26 TIG welding kit (802788). Telwin also lists premium ST26 PRO-P torches in 4 m (743025) and 8 m (743027) lengths with AX50 5-pin connection, a standard ST26 8 m torch (743123), an electrode holder with 25 mm2 cable (804123) and a quick gas connector (804208). For remote current control there are the RC-20 hand control, a foot control and a remote device, and two trolleys, ARCTIC and AMERICA, carry the machine and cylinder.

Check that the workshop has a three-phase 400 V supply protected by a 10 A fuse. At 16.4 kg and 43 x 17.5 x 34 cm the machine can be moved between stations by hand.

Documents and quotation

The attached Telwin product datasheet for code 816116 contains the technical data, compound products and optional accessories. More machines are listed under TIG welding machines.

For a quotation, state whether the machine should be supplied with the TIG accessory kit, the torch length, and any remote control, water cooling or trolley options required.

Telwin is an Italian manufacturer of welding equipment, plasma cutting systems and battery chargers and starters, operating since 1963. The company has its headquarters and industrial centre in Villaverla, in the province of Vicenza. Seven Star LLC is an independent supplier in Muscat and lists the Telwin Supermig 500i XD multi-process inverter.

Telwin divisions and products

The manual welding division covers MIG-MAG, TIG and MMA inverters, including the Supermig i and Technomig ranges, together with torches, wire feeders, cooling units and protective equipment. Further divisions handle plasma cutting, battery charging and starting, charging systems for electric vehicles and car body repair systems.

Ordering Telwin equipment: what we need

Telwin identifies each product by a six-digit code, such as 816201, so send the code with the model name. For a welding set, state whether you need the power source alone or a pack with wire feeder, trolley or water cooling, and give the mains voltage at site.

Frequently Asked Questions