GB/T 33219-2016 in English
VALIDImperfections in brazed joints
- Issued on:2016-12-13
- Implemented on:2017-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$214.00
| Standard No: | GB/T 33219-2016 |
| Document status: | VALID |
| Title in English: | Imperfections in brazed joints |
| Title in Chinese: | 硬钎焊接头缺欠 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2016-12-13 |
| Implemented on: | 2017-07-01 |
| ICS Classification: | 25.160.50-Brazing and soldering |
| Chinese Classification: | J33-Welding and cutting |
| Professional Classification: | GB-National Standard |
| Related Keywords: | joints quality
brazed joints introduction welded joints moderate quality grade requirements defect category typical characteristics detection method quality impact crack |
| Related Topics: | Underwell
under peak GBT33219 GB/T 33219-2016 Bit Brazing Bit execution |
《GB/T 33219-2016硬钎焊接头缺欠》由TC55（全国焊接标准化技术委员会）归口，TC55SC2（全国焊接标准化技术委员会钎焊分会）执行，主管部门为国家标准化管理委员会。
Introduction
1. Background and purpose of the standard
GB/T 33219-2016 "Hard-needle welding joint defects" is my country's first national standard for hard-needle welding technology. It is mainly formulated with reference to the international standard ISO 18279:2003 and combined with my country's actual situation. The standard was issued in 2016 and aims to standardize the classification, detection and quality assessment of hard-needle welding defects to ensure that the quality of welded joints meets the needs of different application scenarios.
2. Core content of the standard
The standard mainly covers the following contents:
- Defect classification and definition: Hard-needle welding defects are divided into six categories: cracks, holes, solid inclusions, bonding defects, shape and size defects and other defects.
- Detection method: Provide specific detection steps and technical requirements to ensure the accuracy and consistency of the detection results.
- Quality Classification: Hard needle welded joints are divided into three quality grades, B, C and D, according to the type and severity of defects, and a detailed quality assessment guide is provided.
| Defect Category | Typical Characteristics | Detection Method | Quality Impact |
|---|---|---|---|
| Crack (Group I) | A sharp notch formed by the destruction of the atomic bond of the material, extending in two dimensions. | X-ray detection, ultrasonic flaw detection, etc. | Severely weaken the strength of the joint and may cause structural failure. |
| Void (Group II) | Voids formed by pores or foreign matter residues, which may be distributed inside or on the surface. | Magnetic particle detection, visual inspection, etc. | Affects the air tightness and mechanical properties of the joint. |
3. Practical application case analysis
Case 1:An aerospace company used the GB/T 33219-2016 standard to test the hard needle welding joint and found a crack (code 1AAA). After in-depth analysis, it was confirmed that the crack was located in the heat affected zone and was of medium severity. According to the standard requirements, the defect must be controlled within 25% of the nominal welding area. Finally, similar defects were eliminated through process optimization.
Case 2:An automobile manufacturer found multiple pores (code 2BAAA) in mass production, with a total area of 40% of the projected area, exceeding the moderate quality grade requirements. After adjusting the welding parameters and shielding gas flow, the company successfully reduced the porosity to below 30%.
4. Implementation Suggestions
To ensure the effective implementation of GB/T 33219-2016:
- Training: Organize technical personnel to publicize the standard and master the defect classification, detection methods and quality grading requirements.
- Equipment update: Equipped with advanced non-destructive testing equipment (such as X-ray flaw detectors, ultrasonic flaw detectors, etc.) to improve detection accuracy.
- Process optimization: Adjust welding parameters according to standard requirements to reduce the possibility of defects.
Quality grade classification of hard pin welding joints
| Quality grade | Applicable scenarios | Recommended defect limits |
|---|---|---|
| Grade B (strict) | Fields with high safety requirements (such as aerospace, nuclear power equipment) | The type and quantity of defects must meet the highest standard requirements. |
| Grade C (medium) | General industrial applications | Defects within a certain range are allowed, but it is necessary to ensure that there is no obvious impact on the performance of the joint. |
| Grade D (moderate) | Non-critical components or internal use | More defects are acceptable, the main concern is that functionality is not affected. |
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