GB/T 28819-2023 in English
VALIDAluminium alloy enclosures for gas-filled high-voltage switchgear
- Issued on:2023-12-28
- Implemented on:2024-07-01
- File Format:PDF
- Delivery:Via email within 5 business days
$582.00
《GB/T 28819-2023充气高压开关设备用铝合金外壳》由TC65（全国高压开关设备标准化技术委员会）归口，主管部门为中国电器工业协会。
Introduction
Core changes and scope of application of the standard
GB/T 28819-2023 replaces the 2012 version of the standard. The main technical upgrades include: adding friction stir welding (FSW) process requirements, improving the heat treatment specifications for cast aluminum alloys, and refining the value rules for welded joint coefficients. It is applicable to SF₆/N₂ mixed gas insulated high-voltage switchgear enclosures with a design pressure of >0.3MPa.
Technical requirements for key materials
| Material type | Elongation requirement | Hydrogen content control | Heat treatment limit |
|---|---|---|---|
| Deformed aluminum alloy | Longitudinal ≥14% | ≤0.002mL/g | Working temperature≤100℃ |
| Casting aluminum alloy | Conform to GB/T1173 | Melt stirring test | ≤66℃ when Mg＞0.7% |
Comparison of design calculation systems
| Method | Safety factor of deformed aluminum | Safety factor of cast aluminum | Applicable scenarios |
|---|---|---|---|
| Formula design (DbF) | 1.5 (yield strength) | 3.5 (tensile strength) | Conventional geometric structure |
| Analysis design (DbA) | 1.05-2.5 | 1.05-2.0 | Complex special-shaped structure |
| Burst test | 2.3 (destructive strength) | 3.5×0.7 casting coefficient | Special parts that cannot be calculated |
Key points of welding process control
The standard adds FSW process requirements, and the key parameters include:
- Rotation speed: 800-1200rpm
- Travel speed: 50-300mm/min
- Shoulder pressure: 5-15kN
Defect repair specifications:The same position shall not be repaired more than 2 times, and the repaired area shall be subject to 100% RT+PT inspection.
Quality Inspection System
Non-destructive testing ratio requirements:
- Class A/B joints: wall thickness ≥25mm requires 100% RT/UT
- Fillet welds: 100% PT inspection
- Local inspection: ≥20% weld length and ≥250mm
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