T-Pro 300
TIG high performance for the workshop.
  • Operation concepts: ControlPro
  • 5 - 300 A
  • ED 60% at 40°C: 270 A (DC) / 230 A (AC)
  • DC and AC/DC versions available
T-PRO 300

Perfect aluminium welding thanks to AC version.

Aluminium TIG welding requires alternating current (AC). Since aluminium is a very good heat conductor, a higher current is required for every additional millimetre of material thickness. Material thicknesses far exceeding 8 mm can be handled easily by the T-Pro 300 welding units. Beyond this, the AC mode optimises the current form for greatest stability, outstanding cleaning effect of the aluminium oxide skin and reduced noise. The integrated spherical cap automatic function ensures perfect arc shaping as well.

Improved welding quality thanks to MACS.

The additional special Lorch MACS (ModulatedACSystem) process improves welding quality by way of targeted heat application. MACS provides outstanding results, in particular when joining different material thicknesses.

Pulsing and fast pulsing at up to 2 kHz.

The integrated pulse and fast pulse function at up to 2 kHz is particularly suitable for processing thin welding sheets. It permits outstanding weld pool control for perfect results even at difficult welding tasks.

Interval point function.

The interval point function reduces heat application. This is of special benefit for welding tasks where warp and temper colours must be avoided, e.g. when processing thin sheets.

Energy efficiency at full power.

The integrated stand-by function ensures turns individual components on and off automatically. The Thermocontrol sensors monitor system temperature and adjust the fan as required to reduce fan noise, dust load inside the machine, and power consumption.

Robust housing.

The T-Pro housing is extremely robust and mobile thanks to its sturdy handles. This makes it ideal for use in a workshop. The top of the housing also makes for a perfect storage surface.

Country-specific product variants.

Country-specific product variants are available for this Lorch welding unit. These may differ in the mains supply, the mains plug or other product features required for the country. You want to know more? Contact your local Lorch partner.

Technical data

TIG welding
Welding range 3~ 400 V: [A] 5 - 300
Voltage range: [V] 10.2 - 20
TIG Duty cycle AC 400 V
Duty cycle AC 100% (40°c): [A] 200
Duty cycle AC 60% (40°c): [A] 230
Duty cycle AC at max. current (40°c): [%] 30
TIG Duty cycle DC 400 V
Duty cycle DC 100% (40°c): [A] 230
Duty cycle DC 60% (40°c): [A] 270
Duty cycle DC at max. current (40°c): [%] 45
Electrode welding
Welding range 400 V: [A] 10 - 200
Voltage range: [V] 20.4 - 28
Weldable electrodes: [Ø in mm] 1.5 - 5
Electrode duty cycle
Duty cycle 100% (40°c): [A] 170
Duty cycle 60%: [A] 200
Duty cycle at max. current (40°c): [%] 60
Process-independent data
Open circuit voltage: [V] 77 - 87
Mains 400 V
Mains voltage 3~ (50/60 Hz): [V] 400
Mains fuse 3~ (50/60 Hz): [A] 16
Positive mains tolerance 3~ (50/60 Hz): [%] 15
Negative mains tolerance 3~ (50/60 Hz): [%] 15
Mains plug
Mains plug: CEE 16
Standards and approvals
Protection class: IP23S
Insulation class: F
Norm/Standard: EN 60974-01
Designation/Certification: CE, S
Cooling type
Cooling type: Gas-cooled , Water-cooled
Standard cooling capacity (l/min): [kW] 1.14
Tank capacity: [l] 3.4
Dimensions length x width x height
Dimensions (LxWxH) [mm] 880 × 400 × 755
Weight: [kg] 60


  • “3 steps and weld” operating concept
  • Simple one-button operation
  • Stepless current adjustment
  • Amperometric digital display
  • User-focused operator guidance with illuminated symbols and welding sequence control
  • Tiptronic job memory for 100 welding tasks


You would like to learn more? Technical data as well as details on application and equipment can be found here:

Always the best advice: close, personal and honest.

You are interested in a Lorch welding machine but you are not sure which model is the right one for you or you have other questions? Use our Partner Finder to easily find a competent contact person near you and get personal advice.