KEMPPI MASTER T 355 DC G AU
Kemppi Master T 355 DC G AU — Professional DC TIG Welder
The Kemppi Master T 355 DC G AU is a professional 3-phase DC TIG welder delivering 350 A from a 400 V supply. Generator-compatible, VRD locked on for Australia. Features Double Pulse, Weld Assist, MicroTack, Bluetooth, and optional 7" TFT panel. Ideal for stainless steel, mild steel, and site TIG welding.
What Is the Kemppi Master T 355 DC G AU?
The Kemppi Master T 355 DC G AU is a professional DC TIG welder designed specifically for the Australian market, delivering 350 A of welding output from a 3-phase 400 V power supply. It is the generator-compatible, VRD-compliant variant of the Master T 355 DC — built for welders and workshops that demand high-output precision TIG performance both in fixed workshop environments and on site.
Three defining characteristics set this model apart:
- DC TIG welding — optimised for stainless steel, mild steel, carbon steel, chrome-moly, copper alloys, and titanium, making it the specialist choice for industrial fabricators, pipe welders, and pressure vessel manufacturers who work predominantly in these materials
- G — Generator compatible — rated and certified for generator power supply with a recommended minimum generator output of 20 kVA, enabling professional DC TIG welding wherever mains infrastructure is unavailable
- AU — Australian market specification — factory-fitted with an Australian mains plug and VRD (Voltage Reduction Device) permanently locked on, reducing open-circuit MMA voltage to 23 V in compliance with Australian workplace health and safety requirements
Weighing 21.5 kg and measuring just 544 × 205 × 443 mm, the Master T 355 DC G AU carries the full premium feature set of Kemppi's Master T platform — including Double Pulse, MicroTack, Auto Pulse, Weld Assist, AutoCool, and Bluetooth wireless connectivity — in a compact, site-ready enclosure.
Designed and manufactured in Finland. Compliant with AS 60974.1-2020 and IEC 60974-1, -3, -10.
Key Features of the Kemppi Master T 355 DC G AU
Professional DC TIG Welding — Precision Across Steel and Alloy Applications
The Master T 355 DC G AU delivers a full 5 A to 350 A DC TIG output range, providing the arc precision and control required for precision fabrication across a wide range of metallic materials. Its primary applications include stainless steel, mild steel, carbon steel, chrome-moly (Cr-Mo) alloys, copper alloys, and titanium — covering the core materials used in pressure vessel fabrication, pipeline construction, structural steel, and food and pharmaceutical manufacturing.
Generator Compatible — Site-Ready TIG Performance
The G designation confirms the Master T 355 DC G AU is rated for generator operation. With a recommended minimum generator power of 20 kVA, it delivers full-rated DC TIG output from a site generator — making it a practical choice for construction sites, maintenance shutdowns, remote infrastructure, and any environment where 3-phase mains supply is not accessible.
VRD Locked On — Australian Safety Compliance
The AU model features a permanently engaged Voltage Reduction Device (VRD) that reduces the MMA no-load voltage from 50 V to 23 V when the arc is not struck. This meets Australian occupational health and safety requirements for welding in confined spaces, on construction sites, and in any environment where electric shock risk must be minimised. VRD status is factory-set and cannot be disabled, providing consistent safety compliance across all operating environments.
Double Pulse TIG
Double Pulse combines alternating pulse cycles to deliver up to 30% faster welding speed and 20% reduced heat input compared to standard pulsed TIG. It minimises weld distortion, reduces labour costs, and produces a visually superior weld seam appearance — particularly valuable for stainless steel fabrication and any application where finish quality or heat management is critical.
Auto Pulse
Auto Pulse simplifies pulsed TIG welding by requiring only the welding current to be set — the power source automatically manages all other pulse parameters. This reduces setup complexity and delivers consistent, repeatable pulse arc performance without requiring the operator to manually configure frequency, peak current, and background current independently.
MicroTack — Precision Tacking with Minimum Heat Input
MicroTack delivers fast, accurate tacking in DC TIG welding with the minimum possible heat input. It is ideal for repetitive tacking operations on thin sheet materials where controlled, consistent tack welds are required. MicroTack can be set between 1 and 5 pulse cycles (or continuous cycle mode), with independently adjustable current level and arc cycle time from 1 to 200 ms — enabling tight control over every tack weld.
Weld Assist — Faster, More Accurate Parameter Setup
Weld Assist guides the operator through a simple on-screen selection process — choosing material type, plate thickness, joint type, and welding position — and automatically sets the optimal welding parameters. It also provides recommendations for electrode size, filler wire, gas flow, groove type, pass profile, and travel speed. Weld Assist is fully compatible with pWPS (preliminary Welding Procedure Specification) creation, making it an essential tool for quality-managed fabrication workshops and welders working to certified procedures.
AutoCool — Intelligent Cooling Management
AutoCool dynamically modulates cooling fan speeds and water cooler run times based on actual welding load and duration. This reduces electrical power consumption and operating noise during lower-output work, with cooling run times adjustable from 15 seconds to 4 minutes depending on welding intensity. AutoCool extends equipment life and reduces operating costs across sustained production welding.
Reliable Arc Ignition
The Master T 355 DC G AU features engineered ignition technology with adjustable spark force energy, ensuring reliable and repeatable arc starts across all output levels — including low-current work on thin materials and long torch extension setups where arc initiation can be challenging.
Bluetooth Wireless Connectivity
Built-in Bluetooth communication supports optional wireless remote controls, enabling current adjustment from the torch position without returning to the power source. This is a significant practical advantage during positional welding, confined space work, and any application where the operator is working at distance from the machine.
Optional 7" TFT Control Panel
When paired with the optional full-colour 7" TFT control panel — protected by a 3 mm impact-resistant armour shield plate — welders gain access to fast parameter setting via Weld Assist, up to 99 memory channels per welding process, and full waveform control. The TFT panel is the recommended choice for workshops running multiple operators, WPS-controlled procedures, or frequent job changeovers. Alternative touch-button control panels are also available.
Impact Bridge Construction
The Master T 355 DC G AU is built from strong, energy-absorbing, recyclable injection-moulded plastic with integrated impact bridge structures that protect the power source from the everyday physical demands of site and workshop use — drops, vibrations, and incidental impacts included.
Weld Time Clock
The integrated weld time clock measures total weld cycle time and supports job data recording. Easy to reset between jobs, it allows welders and supervisors to track and compare welding times for quoting accuracy, productivity benchmarking, and project management.
QR Code Product Access
Each Master T power source carries a unique, scannable QR code providing instant mobile access to product and serial numbers, technical specifications, ordering codes, consumables, user manuals, and local dealer or service contact information — all from a single scan.
Optional WeldEye Cloud Integration
The Master T 355 DC G AU is compatible with Kemppi's WeldEye cloud-based welding quality management platform, enabling digital recording of welding parameters, WPS management, welder qualification tracking, and full traceability reporting for quality-certified applications including AS/NZS, ISO, and ASME-compliant fabrication.
Who Is the Kemppi Master T 355 DC G AU For?
The Master T 355 DC G AU is designed for:
- Pressure vessel and boilermaking fabricators requiring high-output DC TIG on carbon steel, chrome-moly, and stainless steel
- Pipeline and structural steel welders working on site from generators where 3-phase mains is unavailable
- Stainless steel fabricators in food, beverage, dairy, and pharmaceutical industries requiring precision, repeatable DC TIG
- Maintenance and shutdown welders operating in confined spaces where VRD compliance is a mandatory safety requirement
- Construction and civil contractors needing a professional DC TIG and MMA machine that runs reliably from a site generator
- Quality-certified workshops using digital WPS management, pWPS procedures, and welding traceability via WeldEye
- Titanium and exotic alloy fabricators in aerospace, defence, and advanced manufacturing environments
Kemppi Master T 355 DC G AU — Technical Specifications
| Specification | Value |
|---|---|
| Product Code | MST355DCGAU |
| Welding Processes | DC TIG, MMA (Stick) |
| Power Supply | 3-phase, 380–460 V ±10%, 50/60 Hz |
| Mains Fuse | 16 A |
| Rated Max Input Power | 12 kVA |
| Idle Power | 20 W |
| No-Load Voltage (MMA) | 50 V |
| No-Load Voltage (MMA) — VRD Locked On | 23 V |
| No-Load Voltage (MMA/TIG) | 75–95 V |
| Max Output — TIG (30% Duty Cycle) | 350 A |
| Output at 60% Duty Cycle — TIG | 230 A |
| Output at 100% Duty Cycle — TIG | 190 A |
| Max Output — MMA (35% Duty Cycle) | 270 A |
| Output at 60% Duty Cycle — MMA | 230 A |
| Output at 100% Duty Cycle — MMA | 190 A |
| TIG Output Range | 5 A / 1 V – 350 A / 38 V |
| MMA Output Range | 10 A / 10 V – 270 A / 39 V |
| Power Factor (λ) | 0.90 |
| Efficiency (η) | 89% |
| Stick Electrode Diameter Range | 1.6–6 mm |
| Wired Communication | Analog, Kemppi Remote-Bus |
| Wireless Communication | Bluetooth (2400–2483.5 MHz, 10 dBm) |
| Recommended Min Generator Power | 20 kVA |
| Dimensions (L × W × H) | 544 × 205 × 443 mm |
| Weight (without accessories) | 21.5 kg |
| Protection Class | IP23 |
| Operating Temperature | -20°C to +40°C |
| Storage Temperature | -40°C to +60°C |
| EMC Class | A |
| Standards | IEC 60974-1, -3, -10; IEC 61000-3-12; AS 60974.1-2020 |
| Warranty | 3 Years |
| Country of Manufacture | Finland |
Master T 355 DC G AU vs Master T 355 ACDC G AU — Key Differences
| Feature | Master T 355 DC G AU | Master T 355 ACDC G AU |
|---|---|---|
| DC TIG welding | ? | ? |
| AC TIG welding (for aluminium) | ? | ? |
| MAX WeldClean | ? | ? |
| DeMagnetization mode | ? | ? |
| Optima AC Waveform | ? | ? |
| Double Pulse | ? | ? |
| Weld Assist | ? | ? |
| MicroTack | ? | ? |
| Generator Compatible | ? | ? |
| VRD Locked On (AU) | ? | ? |
| Weight | 21.5 kg | 21 kg |
| Aluminium welding | ? | ? |
| Entry price point | Lower | Higher |
Frequently Asked Questions — Kemppi Master T 355 DC G AU
What does DC G AU mean on the Kemppi Master T 355? DC indicates this is a DC-only TIG welder — it supports DC TIG and MMA welding, but not AC TIG. G indicates it is generator-compatible, rated for generator power supply with a minimum 20 kVA generator. AU indicates the Australian market version, which includes an Australian mains plug and has the VRD (Voltage Reduction Device) permanently locked on to comply with Australian workplace health and safety requirements.
Can the Kemppi Master T 355 DC G AU weld aluminium? No. The Master T 355 DC G AU supports DC TIG welding only. Aluminium and aluminium alloys require AC TIG welding. For AC/DC TIG capability including aluminium welding, see the Kemppi Master T 355 ACDC G AU, which also includes MAX WeldClean and DeMagnetization mode.
What materials can the Master T 355 DC G AU weld? The Master T 355 DC G AU is suited to DC TIG welding of stainless steel, mild steel, carbon steel, chrome-moly (Cr-Mo) alloys, copper alloys, titanium, and most other ferrous and non-ferrous metals that weld in DC mode. It also supports MMA (stick) welding with electrodes from 1.6 mm to 6 mm diameter.
What is the duty cycle of the Master T 355 DC G AU? At its maximum rated TIG output of 350 A, the machine operates at a 30% duty cycle. At 230 A it delivers a 60% duty cycle, and at 190 A it runs continuously at 100% duty cycle. For MMA welding, the maximum output of 270 A is available at 35% duty cycle, with 190 A available at 100% continuous.
What generator size does the Master T 355 DC G AU require? Kemppi recommends a minimum generator output of 20 kVA to power the Master T 355 DC G AU at full welding capacity on a 3-phase 400 V supply.
What is VRD and why is it locked on in the AU model? VRD stands for Voltage Reduction Device. When active, it reduces the open-circuit MMA voltage from 50 V to 23 V, significantly lowering the risk of electric shock when the arc is not struck. The AU model has VRD permanently engaged to comply with Australian workplace health and safety legislation — particularly important for welding in confined spaces, on construction sites, and in wet or hazardous environments.
What is the difference between the Master T 355 DC G AU and the Master T 355 DC G? Both models are identical in welding performance, features, and specifications. The AU variant is factory-configured for the Australian market with an Australian mains plug fitted as standard, VRD permanently locked on, and compliance with AS 60974.1-2020. The non-AU model does not have VRD locked on and is not fitted with an Australian plug.
Does the Master T 355 DC G AU come with a control panel? The power source is sold separately from the control panel, allowing customers to select the interface that best suits their workflow. Options include traditional touch-button control panels or the optional full-colour 7" TFT panel with 99 memory channels per welding process, Weld Assist, and full waveform customisation capability. The 7" TFT panel is protected by a 3 mm armour shield plate for workshop durability.
Is the Master T 355 DC G AU compatible with WeldEye? Yes. The machine is compatible with Kemppi's WeldEye cloud-based welding quality management platform, supporting digital WPS management, welding data recording, welder qualification tracking, and full project traceability — essential for fabrication to AS/NZS, ISO, or ASME welding standards.
What is Double Pulse TIG welding on the Master T 355 DC G AU? Double Pulse is an advanced welding mode that alternates between two pulse cycles during DC TIG welding. It delivers up to 30% faster welding travel speeds and 20% lower heat input compared to conventional pulsed TIG — reducing distortion, improving weld appearance, and increasing productivity on stainless steel, chrome-moly, and other alloy applications where heat management is critical.