Transformer Radiator Engineering
& Manufacturing Capabilities

Quality Standards and End-to-End Process Management

Product quality and testing comply with standards including JB/T 5347-2013 and IEC 60076-22-2:2019. Quality management covers the entire process, including manufacturing, welding, cleaning, coating, leak-tightness testing, and final product release.

Multi-Stage Leak-Tightness and Leak Detection Testing

Testing includes leak detection on individual radiator panels, semi-finished products, and galvanized products, as well as liquid penetrant testing (PT) and final leak detection before shipment. The IEC standard requires underwater leak testing at 200 kPa for 30 minutes with no leakage; the Chinese national standard requires leak testing at 150 kPa for 20 minutes with no leakage.

Internal Cleanliness and Welding Process Control

During welding, the assembly tolerance between oil headers and radiator panels is controlled to ≤0.5 mm. Internal surfaces are flushed with solvent at high pressure before coating. After coating, bright-light and borescope inspections are performed. Before shipment, finished products are flushed with K125X transformer oil.

Coating Inspection and Adhesion Testing

Coating inspection: ① Use a cross-cut cutter to cut a grid through the coating down to the substrate. ② Brush five times along each of the two diagonals, then apply adhesive tape to the cut area and peel it off. ③ Inspect the grid area, using a magnifying glass if necessary. ④ Compare the cross-cut results with the standard reference classifications to assess adhesion (classifications above 2 are unacceptable).

Coating adhesion testing: ① ISO 2409 cross-cut test: classification below 1. ② ISO 4624 pull-off test: adhesion strength ≥5 MPa.

Color Difference and Coating Thickness Testing

Use a colorimeter to measure the color difference between the standard color panel and the paint film. Acceptance criterion: ΔE ≤2.0. In accordance with ISO 19840:2012, use a coating thickness gauge to take measurements at five selected points within an area of ≤1 m²; all measured values must meet customer requirements.

Professional Testing Equipment and Inspection Team

Testing equipment includes dimensional measuring tools, paint film thickness gauges, borescopes, leak detection water tanks, and transformer oil analyzers, all calibrated regularly. The company has 15 professional inspectors, all holding vocational skills certificates in quality management and inspection. They are proficient in inspection procedures covering the entire process, including hydrostatic testing, airtightness testing, coating inspection, and non-destructive testing.

Third-Party Inspection and Additional Testing

On-site inspections of the production process and critical operations by third-party organizations such as SGS, BV, and TÜV are supported. Additional testing and inspection, including ultrasonic testing, radiographic testing, coating thickness measurement, and dimensional inspection, can be arranged according to customer requirements.