Profax® PX-400SS Heavy-Duty Weatherproofed Welding Machine

Built for high-output welding in harsh, corrosive, and demanding environments.
The Profax® PX-400SS is a heavy-duty 400 Amp DC constant-current welding power source designed for industrial applications where durability, weather resistance, and dependable output are critical.

Its corrosion-resistant stainless steel frame and panels, double epoxy-coated internal components, and silicone-coated electrical connections help protect the machine in severe operating conditions. The PX-400SS is well suited for Stick welding, Air Carbon Arc gouging, and flux-cored welding with a compatible voltage-sensing wire feeder.

Why Shops Choose the PX-400SS

• Built for Harsh Environments: Stainless steel exterior and protected internal components help resist corrosion and environmental exposure.
• High-Output Performance: Delivers 400 Amps at 36 VDC with a 60% duty cycle.
• Wide Amperage Range: Separate high and low output ranges provide better control across different applications.
• Excellent Stick Performance: Designed to provide strong arc characteristics with 6010 electrodes.
• Multiple Processes: Supports Stick, Air Carbon Arc, and FCAW with a compatible voltage-sensing feeder.

Supported Welding Processes

• Stick Welding (SMAW)
• Air Carbon Arc Cutting and Gouging (CAC-A)
• Flux-Cored Arc Welding (FCAW) with a compatible voltage-sensing wire feeder

Weatherproofed Construction

• Corrosion-resistant stainless steel frame and panels
• Two coats of epoxy spray on internal components
• Silicone-coated electrical connections
• Heavy-duty construction for demanding industrial use

Key Features

• Remote amperage control receptacle
• Excellent 6010 electrode performance
• Control-circuit overload breaker for quick resetting
• High and low output terminals for improved amperage control
• Two wide amperage ranges for more precise adjustment
• Infinite amperage control
• Constant-current output
• Three-year warranty on parts and labor
• Free shipping within the contiguous United States

Remote Amperage Control

The PX-400SS includes a remote amperage control receptacle for applications where the operator needs to adjust welding output away from the power source.

Compatible Remote Control sold separately.

Output Control

Low Current Range:
Use the low output terminals for applications requiring finer amperage control from 45 to 345 Amps.

High Current Range:
Use the high output terminals for heavier welding and gouging applications requiring 80 to 550 Amps.

Infinite Amperage Adjustment:
The continuous output control allows the operator to fine-tune weld current within the selected range.

Ideal Applications

• Shipyards and marine fabrication
• Offshore and coastal welding environments
• Heavy equipment repair
• Structural steel fabrication
• Industrial maintenance
• Air Carbon Arc gouging
• Pipeline and field fabrication
• High-output Stick welding
• Flux-cored welding with a voltage-sensing feeder

Frequently Asked Questions

What welding processes does the PX-400SS support?
It supports Stick welding, Air Carbon Arc cutting and gouging, and flux-cored welding when paired with a compatible voltage-sensing wire feeder.

Why is the machine made from stainless steel?
The stainless steel frame and panels help resist corrosion in harsh, wet, coastal, and industrial environments.

What does weatherproofed construction mean?
In addition to the stainless steel exterior, the internal components receive two coats of epoxy spray and the electrical connections are coated with silicone for added protection.

What is the maximum welding output?
The machine is rated at 400 Amps at 36 VDC with a 60% duty cycle. Its high current range extends up to 550 Amps for applicable operations.

Can I use a remote amperage control?
Yes. The PX-400SS includes a remote amperage control receptacle. The compatible remote control is sold separately.

Does this machine operate on single-phase power?
No. The PX-400SS requires three-phase input power.

Does it include a warranty?
Yes. It includes a three-year warranty on parts and labor.

Is shipping included?
Yes. Free shipping is included within the contiguous United States.