GB/T 7734-2015 in English

《GB/T 7734-2015复合钢板超声检测方法》由TC183（全国钢标准化技术委员会）归口，TC183SC19（全国钢标准化技术委员会钢产品无损检测分会）执行，主管部门为中国钢铁工业协会。
本标准规定了复合钢板超声检测方法的一般要求、检测方法、对比试样、检测设备及其调试、未结合部分的评定和分级等内容。本标准适用于基板厚度4 mm以上的轧制复合钢板和爆炸焊接复合钢板复合面的结合质量的检测。其他规格的复合钢板的超声检测也可参照本标准。?

1 Scope

This standard specifies the general requirements for method for ultrasonic testing of clad steel plates, including testing methods, comparative specimens, testing equipment and debugging, evaluation and grading of unbonded parts, etc.

This standard is applicable to the bonding quality testing of composite surface of rolled clad steel plates and explosive welded clad steel plates with thickness of baseplate above 4mm. this standard may also serve as reference for the ultrasonic testing of clad steel plates of other specifications.

2 Normative references

The following referenced documents are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 2970-2016 Method for ultrasonic testing of thicker steel plates
JB/T 10061 Commonly used specification for A-mode ultrasonic flaw detector using pulse echo technique

3 General requirements

3.1 The surface of plate under testing shall be flat, smooth and uniform in thickness, and shall be free of liquid drop, oil stain, corrosion and other dirt.

3.2 The internal structure of plate under testing shall not generate interference echoes that will affect the testing.

3.3 The testing site shall be protected from strong light, high-intensity magnetic field, violent vibration, corrosive gas, serious dust and other factors that affect the stability of ultrasonic flaw detector or reliable observation by testing personnel.

3.4 The personnel engaged in ultrasonic testing of plates shall hold the qualification certificate of ultrasonic flaw detection at Level 1 and above issued by the certification body, and those who issue the testing report shall obtain the qualification certificate of ultrasonic flaw detection at Level 2 and above issued by the certification body.

4 Testing methods

Foreword i
1 Scope
2 Normative references
3 General requirements
4 Testing methods
5 Comparative specimens
6 Testing equipment and debugging
7 Evaluation and grading of unbonded parts
8 Result evaluation
9 Testing report