GB/T 39166-2020 in English
VALIDTest method of mechanized peel for resistance spot, projection and seam welds
- Issued on:2020-10-11
- Implemented on:2021-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
《GB/T 39166-2020电阻点焊、凸焊及缝焊接头的机械剥离试验方法》由TC55（全国焊接标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Interpretation of the core content of the standard
This standard is equivalent to ISO 14270:2016 and has made technical adjustments based on China's industrial needs. It stipulates the requirements for equipment such as tensile testing machines and the test methods for welded joints with a plate thickness of 0.5-5.0mm.
Key Technical Requirements
| Parameters | ISO 14270:2016 | GB/T 39166-2020 |
|---|---|---|
| Plate Thickness Range | Undefined | 0.5-5.0mm |
| Welding Point Diameter | 7t | 7t and <12mm |
| Bending Radius | Undefined | 2t recommended |
Determination of fracture form
The standard clearly defines three types of fracture forms:
- Boss fracture: includes symmetrical/asymmetrical forms (Figure 1)
- Joint surface fracture: extends along the bonding surface ≤20% of the plate thickness
- Partial boss fracture: mixed fracture
Note: When the fracture occurs at the corner, the bending radius needs to be increased and the test should be repeated (Chapter 7)
Implementation points
- Specimen preparation should give priority to pre-welding bending (thick plate/high-strength steel)
- Seam weld width measurement should be carried out according to Appendix F
- The test report must include 10 data such as bending radius and fracture form (Chapter 8)
Differences from ISO standards
Main technical adjustments include: adding GB/T 16825.1 equipment calibration requirements, refining fracture classification terms, and strengthening solder joint position tolerance control (±1mm). See Appendix B for complete differences.
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