Miller Syncrowave 350LX AC/DC TIG Welder

The Miller Syncrowave 350LX is a professional AC/DC TIG and Stick welding power source designed for precision fabrication, aluminum welding, stainless steel work, aerospace applications, tube and pipe fabrication, maintenance, and demanding industrial environments. With a 3–400 amp welding range, advanced square-wave AC output, adjustable AC Balance, built-in Pulsed TIG capability, and reliable Stick welding performance, the Syncrowave 350LX provides the arc control and process flexibility required for professional welding.

The machine is rated at 350 amps at 34 volts with a 40% duty cycle and 300 amps at 32 volts with a 60% duty cycle, giving welders a clear picture of its performance under different operating conditions. The Syncrowave 350LX is particularly well suited to applications where precise heat control, stable arc performance, and high-quality TIG welds are important.

Important: The exact input-voltage configuration and included accessories should be verified before ordering. Miller has offered the Syncrowave 350LX in multiple input configurations.

Welding Processes

The Miller Syncrowave 350LX supports several professional welding processes:

TIG Welding – GTAW

The Syncrowave 350LX provides AC and DC TIG welding capability for applications requiring precise heat control and clean, high-quality welds.

It can be used for materials and applications including:

• Aluminum
• Stainless steel
• Mild steel
• Nickel alloys
• Copper and compatible alloys
• Precision tube and pipe
• General fabrication

Pulsed TIG – GTAW-P

The built-in pulsing capability alternates between higher and lower welding-current levels to provide greater control over heat input and weld-puddle behavior.

Pulsed TIG can be useful when welding thinner materials, controlling penetration, improving bead appearance, or reducing excessive heat and distortion.

Stick Welding – SMAW

The Syncrowave 350LX also provides Stick welding capability for fabrication, construction, maintenance, repair, pipe work, and other applications where electrode welding is preferred.

Air Carbon Arc – CAC-A

The Syncrowave 350LX can also be used for air carbon arc cutting and gouging when properly configured with the appropriate accessories and compressed-air equipment.

Miller specifies the 350LX for air carbon arc applications using carbon electrodes up to 1/4 inch under the applicable conditions.

AC/DC TIG Welding Capability

One of the primary reasons to choose the Syncrowave 350LX is its ability to perform both AC and DC TIG welding.

AC TIG

AC TIG is particularly useful for aluminum and other applications where oxide removal and controlled penetration are important.

The Syncrowave 350LX’s square-wave AC output and adjustable AC Balance allow the operator to adjust the relationship between cleaning action and penetration according to the material and welding conditions.

DC TIG

DC TIG provides precise arc control for materials such as stainless steel, mild steel, nickel alloys and other compatible metals.

This makes the Syncrowave 350LX suitable for both precision fabrication and heavier professional welding applications.

Key Features

Square-Wave AC Output

The square-wave AC output provides a stable AC TIG arc and allows the operator to adjust AC Balance to control cleaning action and penetration.

This is particularly useful when TIG welding aluminum and other materials where oxide removal and heat control are important.

Adjustable AC Balance

AC Balance allows the operator to fine-tune the amount of cleaning action versus penetration during AC TIG welding.

Proper adjustment can help optimize arc performance, tungsten condition and weld appearance for different aluminum applications.

Synchro Start™

Synchro Start provides three selectable arc-start characteristics — Soft, Medium and Hot — allowing the operator to choose a starting condition appropriate for the tungsten diameter, material thickness and application.

Built-In Pulsar™

The integrated Pulsar™ function provides controlled current pulsing during TIG welding.

By alternating between peak and background current, the pulser can help manage heat input, improve puddle control and reduce distortion on suitable applications.

Last Procedure Recall

Last Procedure Recall automatically restores the previous procedure settings when switching polarity, helping reduce setup time and minimizing unnecessary adjustments between welding operations.

Dual Digital Meters

Dual digital meters provide clear visibility of preset and actual welding parameters, allowing operators to monitor amperage and voltage during setup and welding.

Adjustable Gas Controls

Adjustable TIG gas controls provide control over shielding-gas timing before and after welding.

Postflow can be adjusted as required to help protect the tungsten electrode and weld area as the weld cools.

Optional Sequencer

The optional built-in sequencer allows the operator to establish multiple welding-current stages, including a starting current that can be set above or below the primary welding current.

This can be useful for applications requiring controlled starts, crater filling and more precise heat management.

Fan-On-Demand™

Fan-On-Demand™ operates the internal cooling fan when cooling is required rather than running continuously.

This can reduce unnecessary airflow through the power source and help limit the amount of dust and debris drawn into the machine.

Line Voltage Compensation

Line Voltage Compensation helps maintain consistent welding output when input voltage fluctuates within the machine’s specified operating range.

This can help provide more consistent arc performance in demanding welding environments.

Hot Start

Hot Start temporarily increases current during Stick arc initiation to help establish the arc more easily, particularly when using electrodes that can be difficult to start.

Adaptive Hot Start™

Adaptive Hot Start automatically increases output when additional starting current is needed during Stick welding.

This helps reduce electrode sticking during arc initiation and promotes a more reliable start.

Lift-Arc™ TIG Starting

Lift-Arc TIG starting provides a controlled method of initiating the TIG arc.

The operator touches the tungsten to the workpiece and lifts it away to initiate the arc without requiring a high-frequency start.

Technical Specifications

Note: Input voltage varies according to the specific Syncrowave 350LX configuration. Confirm the machine nameplate, stock number and electrical requirements before installation.

Syncrowave 350LX Input Configurations

Miller has produced the Syncrowave 350LX in multiple input-voltage configurations.

Examples include:

• 907199 – 230/460/575V, 50/60 Hz
• 907198 – 200/230/460V, 50/60 Hz
• 907517 – 220/400/440/520V IEC configuration

The exact configuration available from Prime Welding Supply should be confirmed before purchase.

Applications

The Miller Syncrowave 350LX is designed for professional and industrial welding environments where precise TIG performance and AC/DC versatility are important.

Heavy Industrial Welding

Suitable for demanding fabrication, repair and maintenance applications requiring reliable TIG and Stick welding capability.

Precision Metal Fabrication

The combination of TIG pulse control, AC Balance and controlled arc starting makes the Syncrowave 350LX suitable for precision fabrication work.

Aluminum TIG Welding

AC TIG capability and adjustable AC Balance make the machine particularly useful for aluminum fabrication and repair.

Stainless Steel Fabrication

DC TIG provides precise heat control for stainless steel components where weld appearance and penetration need to be carefully controlled.

Aerospace Fabrication and Repair

The machine’s TIG control features make it suitable for appropriate aerospace-related fabrication and repair applications where the applicable welding procedure and material requirements are followed.

Tube and Pipe Welding

The Syncrowave 350LX can be configured for TIG and Stick tube and pipe applications requiring controlled arc characteristics.

Shipbuilding and Marine Fabrication

AC/DC TIG and Stick capability provide flexibility for fabrication, maintenance and repair operations in marine environments.

Manufacturing

The machine can support precision manufacturing and production applications where AC/DC TIG and Stick welding are required.

Maintenance and Repair

The combination of TIG and Stick capability makes the Syncrowave 350LX useful for maintenance departments handling a wide range of equipment and repair work.

Vocational and Technical Training

The machine’s adjustable welding controls also make it suitable for technical training environments where students need exposure to TIG and Stick processes.

Aluminum TIG Welding with the Syncrowave 350LX

The Syncrowave 350LX is particularly well suited to AC TIG welding aluminum.

AC output helps address the oxide layer present on aluminum, while adjustable AC Balance allows the operator to control cleaning action and penetration.

The combination of:

• Square-wave AC output
• Adjustable AC Balance
• Pulsed TIG
• Controlled arc starts
• Digital metering

provides operators with the control needed for demanding aluminum welding applications.

TIG Welding Features for Precision Work

For precision TIG welding, the Syncrowave 350LX provides several useful controls.

Synchro Start™ helps tailor arc-start characteristics.

Pulsed TIG can help control heat input and puddle behavior.

AC Balance provides control over cleaning action and penetration during AC TIG.

Lift-Arc™ provides a controlled TIG starting method.

Digital meters make it easier to monitor welding parameters.

Together, these features allow experienced welders to fine-tune the machine to suit different materials, tungsten sizes, thicknesses and welding conditions.

Who Is the Syncrowave 350LX For?

The Miller Syncrowave 350LX is suited to:

• Professional TIG welders
• Fabrication shops
• Industrial welding contractors
• Aerospace-related fabrication
• Aluminum fabricators
• Stainless steel fabricators
• Manufacturing facilities
• Maintenance departments
• Pipe and tube fabricators
• Shipbuilding and marine operations
• Technical and vocational welding programs

Power Source vs. Complete Package

The Syncrowave 350LX power source should not automatically be represented as a complete TIG welding package.

Depending on the configuration purchased, additional equipment may be required, such as:

• TIG torch
• TIG torch consumables
• Work cable
• Work clamp
• Remote foot or hand control
• Shielding-gas regulator/flowmeter
• Coolant system
• Running gear

Miller has offered complete package configurations with additional equipment such as a Coolmate cooling system, running gear, TIG torch and remote control.

Only list these items as included when they are part of the exact package being sold by Prime Welding Supply.

Frequently Asked Questions

Is the Miller Syncrowave 350LX an AC/DC TIG welder?

Yes. The Syncrowave 350LX is an AC/DC TIG and Stick welding power source designed for professional TIG and electrode welding applications.

How many amps does the Syncrowave 350LX produce?

The machine has a 3–400 amp welding range. Its rated output is 350 amps at 34 volts at 40% duty cycle, and it produces 300 amps at 32 volts at 60% duty cycle.

Can the Syncrowave 350LX weld aluminum?

Yes. The AC TIG capability and adjustable AC Balance make the Syncrowave 350LX suitable for aluminum TIG welding when properly configured.

Does the Syncrowave 350LX have Pulsed TIG?

Yes. The Syncrowave 350LX includes built-in Pulsed TIG functionality.

Can the Syncrowave 350LX perform Stick welding?

Yes. The machine supports Stick/SMAW welding in addition to TIG.

Can it perform air carbon arc gouging?

Yes, the Syncrowave 350LX can be used for air carbon arc applications when the appropriate accessories and compressed-air equipment are used.

What is the duty cycle of the Syncrowave 350LX?

The machine is rated at 350A at 34V and 40% duty cycle. At a 60% duty cycle, the rated output is 300A at 32V.

What is the weight of the Syncrowave 350LX?

The standard power source weighs approximately 496 lb (225 kg). Complete package configurations can weigh more depending on the included cooling system, running gear and accessories.

What input voltage does the Syncrowave 350LX use?

Input voltage depends on the exact factory configuration. Miller has produced versions for different input-voltage ranges, so the machine’s stock number and nameplate should be verified before installation.

Does the Syncrowave 350LX include a TIG torch?

Not necessarily. The contents depend on the package configuration being sold. Confirm the included accessories before ordering.

Is a cooling system included?

A cooling system is included only when purchasing a package configured with one. Do not assume a cooler is included with the standalone power source.

Order the Miller Syncrowave 350LX

The Miller Syncrowave 350LX AC/DC TIG Welder combines professional TIG control with Stick welding capability, making it a versatile solution for aluminum fabrication, stainless steel welding, precision metalwork, tube and pipe fabrication, maintenance and demanding industrial applications.

With a 3–400A welding range, 350A rated output at 40% duty cycle, built-in Pulsed TIG, square-wave AC, adjustable AC Balance, Synchro Start™, Lift-Arc™ and digital metering, the Syncrowave 350LX provides the control professional welders need for demanding AC/DC TIG applications.

Before ordering, confirm the exact input-voltage configuration, stock number and included accessories to ensure the machine matches your shop’s electrical supply and welding requirements.