Wind power box quality appraisal

wind power box, as the core load-bearing structure of wind turbines, uses welding and forming of high-strength metal materials as the core principle. By optimizing the box structure design and sealing process, it realizes the protection and support of key components such as generators and gearboxes. Its typical applications include internal equipment installation in onshore wind power towers, offshore wind power foundation platform integration and distributed wind power equipment protection. Compared with traditional steel structure boxes, wind power boxes have high corrosion resistance, fatigue resistance, sealing reliability and other characteristics, and are key equipment to ensure long-term stable operation of wind power systems.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide wind power box quality appraisal services. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for wind power box quality appraisal.

With the rapid growth of wind power installed capacity, the number of wind power box quality disputes has gradually increased. The judicial dispute focuses on:

1. Disputes over performance indicators: whether the protection level of the box meets the standard and whether the weld strength meets the design value;

2. Material defects: the chemical composition of the steel is biased Poor, improper matching of welding materials;

3, process problems: the welds are not fused, and the thickness of the surface anti-corrosion coating is insufficient;

4, contract performance issues: the delivery box does not match the technical agreement.

Wind power box quality appraisal technical methods are mainly as follows:

1. Appearance inspection: Check the appearance of the wind power box for defects such as deformation, scratches, corrosion, etc.

2. Electrical performance test: Test the voltage, current, power and other electrical parameters of the wind power box to determine whether its electrical performance meets the requirements.

3. Insulation test: Test the insulation resistance of the wind power box to determine whether its insulation performance is good.

4. Temperature rise test: Conduct a load test on the wind power box, measure its temperature rise, and determine whether its heat dissipation performance meets the requirements.

The applicant, a wind power development company, and the respondent, an equipment manufacturing company, signed a "Wind Power Box Procurement Contract", agreeing to purchase 20 sets of offshore wind power boxes for 3MW units. Half a year after being put into operation, many wind power boxes experienced cracks in welds and corrosion of internal equipment, resulting in a loss of more than 10% of power generation. The development company believed that the box had quality defects and demanded compensation for losses. The manufacturing company argued that the problem was caused by improper installation, and both parties took it to court.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of the "wind power box", contract technical agreement, on-site investigation case materials and other data, and made the following quality analysis opinions:

The main material of the wind power box involved is Q235B steel, with a yield strength of only 240MPa; the welding material is E4303 Welding rod, weld strength is insufficient. The unfused depth of the weld reaches 3mm (standard ≤1mm), and the surface porosity exceeds 2%; the thickness of the anti-corrosion coating is only 100μm (standard ≥150μm), and red rust appeared after 1,000 hours of salt spray testing.

The manufacturing company failed to provide the specified material box and welding materials in accordance with the contract. The process defects were significant, which constituted a fundamental breach of contract and was the main cause of equipment problems.

The wind power box quality appraisal report should include the following content:

1. The purpose and basis of the appraisal.

2. Model, specification, manufacturer and other information of the equipment being identified.

3. Identification method.

4. Identification results (including whether there are quality problems, causes of problems, etc.).