TIG Welders

Invertig 400 AC/DC

Product # 601602


Welding Cart, Smart Water-Cooler, 12’ 18 Series Trim Line Water-Cooled TIG Torch, TIG Torch Consumable Kit, 12’ Foot Pedal, 15’ Ground Clamp, Flowmeter, Gas Hose, 1-Gallon of Coolant

Does Not Include:
Gas Bottle, Filler Rod, Power Plug

    Our Price:
  • Regular price $6,995.00


We designed the all new HTP America® Invertig 400 AC/DC for heavy use in industrial settings; applications of use include precision fabrication, motor sports and racing fabrication, pipe fabrication, aluminum fabrication, aerospace work and repair, along with work and repair in ship and rail yards. The Invertig 400 runs the following processes: TIG (GTAW), Pulsed TIG (GTAW-P), Stick (SMAW), and Pulsed Stick (SMAW-P). When connected to single phase, 208V to 240V power, the Invertig 400 features the highest output of any welder on a 50 amp circuit—a full 350 amps of raw welding power! Additionally, the versatile Invertig 400 runs on 3-phase power from 208V to 575V, providing the full welding amperage of 4 to 400 amps. The Invertig 400 showcases a rated output of 350 amps when run on single phase and a rated output of 400 amps, with a remarkable 100% duty cycle at 300 amps, when run on 3-phase.

General Features

  • Automatically adjusts for input voltage: 208-240V on single phase and 208-575V on 3-phase
  • Meters can be calibrated for certification
  • Smart water-cooler that only turns on when needed and stops the arc when it detects a low coolant level
  • The cooling fans blow directly into heat sinks and the circuit boards are protected from grinding dust and moisture by a special lacquer coating which makes the machine IP23
  • Cooling fans work on-demand; the fans only power up when cooling is required, reducing noise and eliminating unwanted grinding dust from being pulled into the machine while the machine is idling
  • Lift Arc Start gives you the option of TIG arc initiation without high frequency (useful when you work around sensitive electronics where high frequency is unwanted)
  • 30 memory programs allow you to save specific welding parameters for 30 different welding jobs

Stick Features

  • Arc Force (DIG): Helps reduce "sticking" of the electrode
  • Hot Start: For easy arc strikes
  • DC and AC Stick Welding: AC frequency and balance can be adjusted in Stick mode as well
  • Pulse Stick Welding: Makes bridging gaps easier, welds out of position better, and reduces heat input

TIG Features

  • 350 amp output on 50 amp Single Phase Circuit
  • Asymmetric AC allows you to limit Electrode Positive or Electrode Negative amperages separately, which gives you more control over heat input on critical welds
  • AC Balance: Adjustable from 10 to 90%; allows precise control of oxide removal vs. penetration
  • AC Frequency: 20Hz to 400Hz (up to 99 amps) and 20Hz to 200Hz (over 100 amps); Helps reduce or enhance heat input and focus the arc
  • Three AC Waveforms: Soft Square, Square, and Triangular

The Invertig 400 AC/DC complete water-cooled package includes the following items:

– Invertig 400 AC/DC Power Source
– Welding Cart
– Smart Water-Cooler
– 12' 18 Series Trim Line Water-Cooled TIG Torch
– 12' Foot Pedal
– Flowmeter
– Gas Hose
– 1 Gallon of Coolant
– TIG Torch Consumable Kit
– 15' Ground Cable and Clamp Assembly

*Please note: This is the base package for the Invertig 400. Upgrade options are available. Please contact Customer Service at (847) 357-0700 to discuss your upgrade options.


Welding Current Single Phase 4 to 350 Amps
Welding Current 3-Phase
40 to 400 Amps
Single Phase Rated Output 35% @ 350 Amps
230V Single Phase Input Amps @ Rated Load 50 Amps
3-Phase Rated Output 30% @ 400 Amps
3-Phase Input Amps @ Rated Load

230V = 36 Amps
400V = 21 Amps
460V = 17.6 Amps
500V = 16.8 Amps

Welding Modes (5)

TIG Spot
TIG Reset

Programmable Memories


Asymmetric AC


AC Frequency (Hz)

20 to 400 (Up to 100 Amps)
20 to 200 (Over 100 Amps)

AC Balance (%) 10 to 90
Pre-Flow (Seconds) 0.1 to 5.0
Post-Flow (Seconds) 0.1 to 99.9
Initial Amps (%) 10 to 90
Final Amps (%) 10 to 90
Slope Up (Seconds) 0.1 to 10.0
Slope Down (Seconds) 0.1 to 10.0
Spot Time (Seconds) 0.1 to 10.0
Hot Start (%) 0 to 50
Arc Force (%) 0 to 500
Wave Forms Soft Square
EN Amperage (%) 10 to 99
EP Amperage (%) 10 to 99
Duty Cycle Single Phase TIG 35% @ 350 Amps
60% @ 250 Amps
100% @ 200 Amps
Duty Cycle 3-Phase TIG 30% @ 400 Amps
60% @ 340 Amps
100% @ 300 Amps
Duty Cycle Single Phase Stick 35% @ 260 Amps
60% @ 200 Amps
100% @ 180 Amps
Duty Cycle 3-Phase Stick 35% @ 300 Amps
60% @ 240 Amps
100% @ 200 Amps
Power Source Alone
On Welding Cart

26-1/2" L x 12-1/4" W x 17-1/2" H
38-1/2" L x 20-1/2" W x 41" H
Power Source Alone
Power Source & Cart
Power Source, Cart, & Water-Cooler

117 Lbs.
204 Lbs.
250 Lbs.
Pulse Parameters
Pulses/Second (PPS) Stick AC & DC
Pulses/Second (PPS) TIG AC
Pulses/Second (PPS) TIG DC
Peak Time (%)
Background Amps (%)

0.4 to 5.0
0.4 to 10.0
0.4 to 999.9
10 to 90
10 to 90

CA Prop 65 - For Residents of California
Warning: Welding and cutting equipment, accessories, and fumes can expose you to chemicals, including Chromium (Hexavalent Compounds), Lead, and Nickel, which are known to the State of California to cause cancer and/or birth defects or other reproductive harm. For more information, please visit www.P65Warnings.ca.gov.