Welding Power Source Unit | Component for Metal Fabrication

Product Specifications

Technical details and manufacturing context for Power Source Unit

Definition

A power source unit is the core electrical component of a welding power source and torch system. It converts input electrical power (typically AC mains or generator power) into the specific type, voltage, and amperage of output power required for a particular welding process (e.g., SMAW, GMAW, GTAW). It houses the transformers, rectifiers, inverters, and control circuitry necessary to generate a stable, controllable welding arc. The unit is designed for use in fabricated metal product manufacturing, where it serves as a component in welding systems. It is available in various configurations to match different welding processes and duty cycles. The unit typically operates with a three-phase AC input voltage of 380 V ±10% at 50/60 Hz, drawing an input current of 20–60 A at rated output. It delivers an output current of 100–500 A at a 60% duty cycle, with an output voltage of 20–40 V. The open-circuit voltage is limited to 60–80 V for safety. Efficiency ranges from 85–92%, and power factor from 0.85–0.95. The unit operates in ambient temperatures from -10°C to 40°C and can be stored in temperatures from -20°C to 55°C. It has an IP23 protection class, meaning it is protected against water spray, and an insulation class F, with a maximum hot spot temperature of 155°C. The weight varies from 30–80 kg, and dimensions range from 500×300×400 mm to 800×500×600 mm. Materials used include electrical steel for transformer cores, copper for windings, aluminum for heat sinks, electronic components, insulating materials, and steel for the chassis. The unit complies with IEC 60974-1 for welding power sources and IEC 60529 for protection class. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The unit receives alternating current (AC) input, typically three-phase. This AC is first transformed to a suitable voltage. In traditional units, it is then rectified to direct current (DC). In modern inverter-based units, the AC is rectified to DC, then switched at high frequency by transistors (IGBTs/MOSFETs) to create a high-frequency AC, transformed to a lower voltage, and finally rectified back to DC for output. This process, controlled by feedback circuits, allows for precise adjustment of output characteristics (constant current, constant voltage, or pulsed) to match welding requirements.

Common Materials

Electrical Steel (for transformer cores), Copper (for windings and conductors), Aluminum (for heat sinks), Electronic Components (semiconductors, capacitors, resistors), Insulating Materials, Steel (for chassis and enclosure)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Input Voltage	380 ±10% V AC	Three-phase, 50/60 HzIEC 60974-1
Rated Input Current	20–60 A	At rated outputIEC 60974-1
Rated Output Current	100–500 A	At 60% duty cycleIEC 60974-1
Rated Output Voltage	20–40 V	Corresponds to arc lengthIEC 60974-1
Duty Cycle	60 %	At rated current, 10 min cycleIEC 60974-1
Open Circuit Voltage	60–80 V	Safety limit per standardIEC 60974-1
Efficiency	85–92 %	At rated output
Power Factor	0.85–0.95	At rated output
Operating Temperature Range	-10–40 °C	AmbientIEC 60974-1
Storage Temperature Range	-20–55 °C	Non-condensing
Protection Class	IP23	Protected against water sprayIEC 60529
Insulation Class	F	155°C max hot spotIEC 60085
Weight	30–80 kg	Depends on rated current
Dimensions (L×W×H)	500×300×400–800×500×600 mm	Approximate, varies with model

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Main Transformer / Inverter Circuit
Steps up/down input voltage and provides electrical isolation. In inverter units, converts DC to high-frequency AC for efficient transformation.

Material: Electrical Steel, Copper, Insulation
Rectifier / Output Stage
Converts AC to DC welding current. In inverter units, rectifies the high-frequency AC back to smooth DC.

Material: Semiconductor Diodes/Thyristors
Control Circuit Board
Contains the microprocessor and logic circuits that regulate output parameters, manage user interface inputs, and provide protective functions.

Material: Fiberglass (PCB), Electronic Components
Cooling System (Fan & Heat Sinks)
Dissipates heat generated by transformers, semiconductors, and other components to maintain safe operating temperatures.

Material: Aluminum, Plastic
Output Terminals / Connectors Part
Provide the physical connection points for the welding cables leading to the electrode holder/work clamp or torch.

Material: Copper Alloy, Brass

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Welding Power Source & Torch

View system integration details

Manufacturers of Power Source Unit

Manufacturer profiles associated with Power Source Unit.

Sourcing Power Source Unit from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Frequently Asked Questions

What is the primary function of a power source unit in a welding system?

It converts input electrical power into the specific type, voltage, and amperage required for the welding arc, ensuring a stable and controllable output for processes like SMAW, GMAW, and GTAW.

What are the typical input and output specifications?

Typical input is three-phase 380 V AC ±10% at 50/60 Hz, with input current 20–60 A. Output current ranges from 100–500 A at 60% duty cycle, output voltage 20–40 V, and open-circuit voltage 60–80 V. These are reference ranges; confirm with the manufacturer.

What standards apply to this component?

The unit is designed to meet IEC 60974-1 for welding power sources and IEC 60529 for protection class (IP23). Compliance should be verified with the legal manufacturer or supplier.

What materials are used in its construction?

Materials include electrical steel for transformer cores, copper for windings, aluminum for heat sinks, electronic components, insulating materials, and steel for the chassis and enclosure.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Buyer enquiry

Request manufacturing insight for Power Source Unit

Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.

Where it goes: Straight to the CNFX editorial desk, and to the manufacturer if this product is linked to a claimed profile. Nothing is broadcast to a supplier list.
Your details stay here: We do not sell or rent enquiry data, and we do not add you to a mailing list. Used only to answer this request.
No commission, no middleman: CNFX is a directory. We take no cut of any order and never negotiate on a supplier's behalf.
What we don't claim: A listing is not an endorsement. Qualify every supplier and verify every figure yourself before ordering.

pressure:	N/A (electrical component, not fluid handling)
other spec:	Input Voltage Range: 200-600V AC, 50/60Hz ±10%; Output Current Range: 10-600A DC; Duty Cycle: 60% at max rated output
temperature:	0°C to 40°C (operating ambient), -20°C to 70°C (storage)

Power Source Unit

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards