KEMPPI MASTER T 505 ACDC GM AU

Kemppi Master T 505 ACDC GM AU — Professional 500 A AC/DC TIG Welder

The Kemppi Master T 505 ACDC GM AU is the most powerful AC/DC TIG welder in the Master T range, delivering 500 A from a 3-phase 400 V supply. Multi-voltage, generator-compatible, VRD-compliant for Australia. Features MAX WeldClean, DeMagnetization, Double Pulse, Optima AC, and Weld Assist. Built for heavy aluminium, stainless, and industrial TIG welding.

What Is the Kemppi Master T 505 ACDC GM AU?

The Kemppi Master T 505 ACDC GM AU is the flagship model of the Master T series and the most powerful AC/DC TIG welder in the Kemppi professional range. Delivering 500 A of welding output from a 3-phase 400 V power supply, it is engineered for the most demanding industrial TIG welding applications — from heavy aluminium fabrication and large pressure vessel construction to structural stainless steel and high-specification pipeline work.

Four key features define this model:

• AC/DC TIG capability — full AC TIG for aluminium and aluminium alloys, full DC TIG for stainless steel, mild steel, chrome-moly, titanium, and other metals, plus MMA (stick) welding up to 400 A
• GM — Generator compatible and Multi-voltage — runs on standard 3-phase 400 V supply or a 3-phase 220–230 V low-range input, delivering up to 450 A TIG output at low-range voltage, with full generator compatibility
• AU — Australian market specification — fitted with an Australian mains plug and VRD (Voltage Reduction Device) permanently locked on, meeting Australian workplace health and safety requirements across all operating environments
• Maximum output headroom — at 500 A TIG, the Master T 505 ACDC GM AU handles material thicknesses, joint configurations, and welding speeds that are simply beyond the reach of 350 A class machines

At 57 kg and measuring 860 × 263 × 610 mm, this is a substantially larger and heavier machine than other models in the Master T range — reflecting the transformer capacity, cooling infrastructure, and power electronics required to sustain 500 A AC/DC TIG performance. It is designed to be installed in a fixed or semi-fixed workshop position, on a transport cart, or crane-lifted to a working level on site.

Designed and manufactured in Finland. Compliant with AS 60974.1-2006, IEC 60974-1, -3, -10, and GB/T 15579.1.

Key Features of the Kemppi Master T 505 ACDC GM AU

500 A AC/DC TIG Output — The Highest in the Master T Range

The Master T 505 ACDC GM AU delivers a full 5 A to 500 A AC/DC TIG output range, covering everything from delicate thin-sheet precision work to the highest-output demands of heavy industrial fabrication. At 500 A, the machine sustains the arc energy required to weld thick aluminium plate, large-diameter stainless pipe, heavy-walled pressure vessels, and structural components that would be at the limits of — or beyond — a 350 A class power source.

AC TIG Welding for Aluminium — Professional Grade

AC TIG welding is the preferred process for aluminium and aluminium alloys, and the Master T 505 ACDC GM AU delivers it at the highest output level in the Master T family. The Optima AC waveform provides full control over arc character — welders can choose between sine, square, or Optima AC depending on the alloy, thickness, and application — delivering superior fusion, bead appearance, and oxide layer cleaning on aluminium fabrications of all sizes.

Multi-Voltage Operation — 400 V and 220–230 V (3-Phase)

The GM model accepts both 3-phase 380–460 V ±10% (standard industrial supply) and 3-phase 220–230 V ±10% (low-range multi-voltage input). At 400 V, it delivers the full 500 A TIG output. At 220–230 V low-range, it delivers up to 450 A TIG at a 40% duty cycle — maintaining near full performance even on lower-voltage 3-phase supplies. This multi-voltage flexibility is a critical advantage for operations running across multiple sites or international facilities with different 3-phase voltage standards.

Generator Compatible — High-Output TIG on Site

The G designation confirms the Master T 505 ACDC GM AU is rated and tested for generator operation — enabling professional 500 A AC/DC TIG welding in environments without fixed 3-phase mains infrastructure, including major construction projects, mining and resources sites, shipyard docking areas, and offshore facilities.

VRD Locked On — Australian Safety Compliance

The AU model features a permanently engaged Voltage Reduction Device (VRD), reducing the MMA open-circuit voltage to 23 V when the arc is not struck. This satisfies Australian occupational health and safety regulations for welding in confined spaces, on construction sites, and in any environment where electric shock risk requires mitigation. VRD is factory-set and cannot be disabled.

MAX WeldClean — Electrolytic Weld Cleaning Built In

Every Master T ACDC model — including the 505 — includes MAX WeldClean as standard. This electrolytic cleaning mode removes oxidation and discolouration from stainless steel welds directly from the welding machine, without the need for separate post-processing equipment. For high-volume stainless fabricators in food, pharmaceutical, architectural, and industrial applications, MAX WeldClean delivers significant time and cost savings on surface finishing.

DeMagnetization Mode

The DeMagnetization (degaussing) mode eliminates residual magnetic fields in parent material caused by magnetic lifting equipment, magnetic workholding, or proximity to heavy electrical machinery. Residual magnetism degrades arc stability and directional control in TIG welding; eliminating it before welding restores consistent arc behaviour — particularly important on large steel fabrications and assemblies that have been handled extensively through production.

Double Pulse TIG

Double Pulse alternates between two pulse cycles to deliver up to 30% faster welding travel speed and 20% reduced heat input compared to standard pulsed TIG. This directly reduces distortion on heat-sensitive materials, lowers labour costs on long-seam production welding, and produces a visually superior weld seam — making it particularly effective on stainless steel pipe, aluminium structural fabrications, and precision mechanical components.

Optima AC Waveform

The Optima AC waveform is Kemppi's engineered AC TIG arc profile that combines the preferred characteristics of sine and square waveforms into a single, configurable output. Welders can freely select between sine, square, or Optima AC to tune the arc character to the specific aluminium alloy, joint geometry, and surface condition — providing the most refined AC arc control available in the Master T platform.

MicroTack — Precision Tacking at Any Scale

MicroTack delivers fast, controlled tacking in both AC and DC TIG welding with the minimum heat input necessary. Configurable from 1 to 5 pulse cycles or continuous mode, with independently adjustable current and arc cycle time from 1 to 200 ms, MicroTack ensures consistent, repeatable tack weld quality whether the application is thin-sheet aluminium skin panels or heavy structural steel sections.

Weld Assist — Guided Parameter Setup for Every Welder

Weld Assist guides operators through on-screen material, thickness, joint type, and welding position selections and automatically sets optimal welding parameters. It also recommends electrode size, filler wire, gas flow, groove type, pass profile, and travel speed — reducing setup errors and improving consistency across multi-operator workshops and shift changes. At 500 A output, accurate parameter setup is critical to avoid weld defects and material damage; Weld Assist removes the guesswork. Full pWPS (preliminary Welding Procedure Specification) compatibility is included for quality-managed environments.

AutoCool — Intelligent Cooling Management

AutoCool dynamically modulates fan speed and water cooler run times based on the actual welding load and duration. On a 500 A machine operating in a production environment, AutoCool's ability to reduce idle cooling energy and noise during lower-output intervals delivers meaningful efficiency gains across a full working day.

Reliable Arc Ignition at High Output

The Master T 505 ACDC GM AU features Kemppi's engineered ignition technology with adjustable spark force energy — ensuring clean, reliable arc starts at all output levels, including high-current applications where tungsten electrode condition and arc initiation technique are critical to weld quality.

Bluetooth Wireless Connectivity

Built-in Bluetooth communication supports optional wireless remote controls, including the HR45 wireless hand remote and FR45 wireless foot pedal — enabling current adjustment from the torch or foot pedal without returning to the power source. The foot pedal remote is particularly valuable for precision TIG welding where current ramp control during puddle management is required.

Optional 7" TFT Control Panel

The optional full-colour 7" TFT control panel, protected by a 3 mm armour shield plate, provides fast parameter setting, full Weld Assist access, and up to 99 memory channels per welding process — essential for high-throughput workshops running multiple materials, WPS-controlled procedures, and frequent job changeovers. The 7" TFT panel is required to access MAX WeldClean and DeMagnetization modes.

Transport and Mobility Options

The Master T 505 ACDC GM AU is compatible with the P45MT 4-wheel transport cart and T25MT 2-wheel transport cart — both featuring floor-level gas cylinder loading for safe handling of shielding gas cylinders. At 57 kg, the 505 is designed to travel on a cart rather than be hand-carried, making the right transport solution an important part of the system configuration.

Weld Time Clock

The integrated weld time clock supports total weld cycle measurement and job data recording — allowing welders and supervisors to track arc-on time per job, compare productivity across shifts, and support accurate project quoting on high-value fabrications.

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.

Optional WeldEye Cloud Integration

The Master T 505 ACDC GM AU is compatible with Kemppi's WeldEye cloud-based welding quality management platform, enabling full digital recording of welding parameters, WPS management, welder qualification tracking, and project traceability — essential for fabrication to AS/NZS, ISO, EN, and ASME welding standards, and for any quality-certified operation where 100% weld traceability is required.

Who Is the Kemppi Master T 505 ACDC GM AU For?

The Master T 505 ACDC GM AU is designed for:

• Heavy aluminium fabricators in marine, defence, naval, aerospace, and structural construction requiring 500 A AC TIG output for thick-section aluminium plate and extrusions
• Pressure vessel and heat exchanger manufacturers welding heavy-walled stainless steel and chrome-moly components where high output and duty cycle are non-negotiable
• Pipeline fabricators and contractors working on large-diameter pipelines in carbon steel, chrome-moly, and stainless steel, both in fixed shops and on generator-powered sites
• Shipyards and offshore fabricators needing maximum-output AC/DC TIG capability with generator flexibility and Australian safety compliance
• Mining and resources infrastructure teams running from site generators on remote projects where high-output TIG performance and multi-voltage flexibility are essential
• Quality-certified fabrication workshops running WPS-controlled procedures, digital welding records, and traceability reporting to AS/NZS, ISO, or ASME standards
• Heavy manufacturing and OEM operations where sustained high-duty-cycle TIG welding is a production bottleneck that requires a machine designed to operate continuously at high output

Kemppi Master T 505 ACDC GM AU — Technical Specifications

Master T 505 ACDC GM AU vs Master T 355 ACDC G AU — Key Differences

Frequently Asked Questions — Kemppi Master T 505 ACDC GM AU

What does 505 ACDC GM AU mean on the Kemppi Master T? 505 refers to the 500 A maximum TIG output. ACDC indicates the machine supports both AC TIG (for aluminium) and DC TIG (for steel, stainless, titanium, and other metals). GM indicates generator compatibility and multi-voltage input — accepting both standard 3-phase 400 V and 3-phase 220–230 V supplies. AU indicates the Australian market version, with an Australian mains plug and VRD permanently locked on.

What is the maximum output of the Kemppi Master T 505 ACDC GM AU? On a standard 3-phase 400 V supply, the machine delivers a maximum TIG output of 500 A at a 30% duty cycle. On the 3-phase 220–230 V low-range multi-voltage supply, it delivers up to 450 A TIG at a 40% duty cycle. For MMA welding, the maximum output is 400 A.

Can the Kemppi Master T 505 ACDC GM AU weld aluminium? Yes. The AC TIG mode and Optima AC waveform make the 505 ACDC GM AU fully capable of welding aluminium and aluminium alloys at up to 500 A — making it one of the highest-output aluminium TIG welders available in the Australian professional market. It is well-suited to heavy aluminium plate, structural sections, and large-format marine or defence fabrications.

How heavy is the Kemppi Master T 505 ACDC GM AU? The Master T 505 ACDC GM AU weighs 57 kg without accessories — significantly heavier than the 355-class Master T models at 21 kg. It is designed to be used with the P45MT 4-wheel transport cart or T25MT 2-wheel cart and is intended for fixed or semi-fixed installation rather than frequent manual relocation.

What is the difference between the Master T 505 and the Master T 355? The primary difference is output capacity. The 505 delivers 500 A TIG (vs 350 A for the 355), handles MMA up to 400 A (vs 270 A), and is physically much larger at 57 kg (vs 21 kg). The 505 also includes multi-voltage 3-phase low-range input capability, enabling operation on 220–230 V 3-phase supply at up to 450 A — a feature not available on the 355 ACDC G AU. Both models include the full Master T ACDC feature set including MAX WeldClean and DeMagnetization.

What is MAX WeldClean on the Master T 505 ACDC GM AU? MAX WeldClean is a built-in electrolytic cleaning mode that removes oxidation and discolouration from stainless steel welds using the welding machine itself — without additional post-processing equipment. On a 500 A machine handling large stainless fabrications, MAX WeldClean delivers significant time and cost savings on surface finishing for food grade, pharmaceutical, architectural, and industrial applications.

Is the Master T 505 ACDC GM AU compatible with WeldEye? Yes. The machine is compatible with Kemppi's WeldEye cloud-based welding quality management platform, enabling digital WPS management, welding data recording, welder qualification tracking, and full project traceability — critical for fabrication to AS/NZS, ISO, EN, and ASME welding standards.

What control panel options are available for the Master T 505 ACDC GM AU? The power source is sold separately from the control panel. The recommended option for most professional users is the full-colour 7" TFT panel with Weld Assist, 99 memory channels per welding process, and full waveform customisation. The 7" TFT panel is also required to access MAX WeldClean and DeMagnetization modes. Touch-button panel alternatives are also available.

What wireless remote controls are available for the Master T 505 ACDC GM AU? The machine supports the HR45 wireless hand remote for current adjustment from the torch position, and the FR45 wireless foot pedal for hands-free current ramp control during precision TIG welding. Both communicate via Bluetooth.

Why does the Master T 505 weigh 57 kg when the 355 weighs 21 kg? The 505's 57 kg weight reflects the substantially larger transformer, cooling system, and power electronics required to sustain 500 A AC/DC TIG output. At 500 A the power handling demands are considerably greater than at 350 A, particularly in AC mode where the machine must generate and control both positive and negative half-cycles of the AC waveform at high current. The larger physical enclosure also accommodates the integrated cooling infrastructure for sustained high-duty-cycle operation.