Stainless Steel Radiator

【Transformer Radiator】

The panel-type radiator is a critical cooling device specifically designed for oil-immersed power transformers, reactors, and other transformer-type equipment. As the mainstream heat dissipation solution for large oil-immersed transformers, this product offers significant advantages including simple structure, high heat dissipation efficiency, and low cost. It is a core component that ensures the normal operation of transformers and extends equipment service life.

【Product Structure & Manufacturing Process】

Panel Structure

Kaiyang panel-type radiators are manufactured by externally welding header pipes and radiator panel units. The radiator panels are roll-formed from high-quality cold-rolled steel sheets and welded into panel units via automated welding lines. The header pipes are precisely punched from seamless steel tubes.

Welding Technology

The header pipes and radiator panels are joined using CO₂-argon mixed gas shielded welding, which effectively eliminates weld slag and metal filings that could compromise the main equipment quality. The panels feature a fully corrugated oil channel design, which expands the heat dissipation area while reducing oil channel clearance.

Precision Assembly

Radiator welding employs an electrically adjusted hydraulic clamping assembly table with dual-side correction combs, ensuring panel diagonal deviation ≤0.5mm and flatness error ≤0.3mm. Panasonic digital inverter MIG welders (80% CO₂ + 20% Ar) deliver weld tensile strength ≥350MPa, with spatter reduction exceeding 40% and uniform, aesthetically pleasing weld seams.

The automatic flange welding machine features dual-side support columns that firmly stabilize the panel-type radiator, precisely ensuring perpendicular accuracy between the header pipes and flange faces, with single-pass weld formation, stable penetration depth, and high welding strength.

Surface Preparation

Through-Type Shot Blasting: Equipped with 14 blast wheels for full 360° surface coverage, removing weld spatter, uniforming surface texture, increasing roughness profile, and simultaneously relieving internal stress.

Automatic Dipping Phosphating: A fully automated immersion cycle processes each radiator through acid pickling, surface conditioning, and phosphating – eliminating microscopic corrosion and forming a dense phosphate conversion coating.

Internal Wall Coating: High-solubility, fast-evaporating solvent flush of ≥5 minutes removes dust and residual oil. Circulation flood coating applies an even paint film at 15–25μm with 120-mesh filtration on both cycles.

External Coating: Flow coating followed by in-line touch-up and continuous drying in a tunnel oven (110–120°C for 40 minutes) ensures full curing of the paint film.

Leak Testing

Full-submersion hydrostatic leak testing at 220kPa – 47% above industry standard – with leak point detection within ≤30 seconds. Repair welding uses Panasonic digital TIG welders with current stability ≤±1A, achieving repair strength matching the original body with no visible weld marks.

Integrated Production Chain

Kaiyang Electric maintains a fully integrated in-house production chain from high-precision cutting, precision welding, systematic flushing, to final pressure testing. The production center is equipped with over 300 advanced processing and inspection systems, supporting one-stop, high-standard fabrication and volume delivery.

【Technical Parameters (Reference)】

Parameter	Range
Header Center Distance	1500 – 4500mm
Panel Width	520mm
Panel Spacing	45mm (Reference)
Number of Panels	8 – 40 panels
Surface Treatment	Painted / Hot-Dip Galvanized

【Product Advantages】

High-Efficiency Heat Dissipation

Full corrugated oil channel structure provides large heat dissipation area, low oil flow resistance, and superior heat exchange performance.

Robust Construction & Precision

High mechanical strength and strong deformation resistance, suitable for various demanding operating conditions. Precision manufacturing ensures diagonal deviation ≤0.5mm and flatness error ≤0.3mm, guaranteeing consistent product quality across every batch.

Superior Weld Quality

Panasonic digital inverter welding technology delivers tensile strength ≥350MPa with over 40% spatter reduction. Weld seams are uniform, smooth, and aesthetically pleasing, ensuring structural integrity and long-term reliability.

Reliable Quality Assurance

Strictly manufactured in compliance with ISO9001, ISO14001, ISO45001, and ISO3834 international standards. Each unit undergoes comprehensive testing before shipment, including leak testing at 220kPa – 47% above industry standard.

Enhanced Corrosion Resistance

Comprehensive surface treatment system – shot blasting, automatic dipping phosphating, internal wall coating, and external painting – provides multi-layer protection against corrosion, significantly extending product service life.

Flexible Customization

Available in fixed and detachable mounting types. Panel width (520mm), number of panels (8–40), center distance (1500–4500mm), and surface treatment (painted/hot-dip galvanized) can be customized to meet specific requirements.

Proven Industry Track Record

With over 200 power project track records and deep cooperation with industry giants including China XD Group, TBEA, Shandong Electric, Luneng Group, and Taikai Group, Kaiyang Electric’s products are trusted in critical power infrastructure projects across China, Central Asia, Southeast Asia, Africa, Europe, and the Americas.

One-Stop Integrated Manufacturing

Fully integrated in-house production chain – from precision cutting and welding to surface treatment and testing – ensures strict quality control at every stage, enabling efficient production, consistent quality, and on-time delivery.

Widely used for circulating heat dissipation in oil-immersed power transformers, reactors, rectifiers, power capacitors, and related equipment.

For custom specifications, please contact us with your detailed requirements, and we will design the optimal cooling solution tailored to your needs.