GB/T 7734-2015Method for ultrasonic testing of clad steel plates (English PDF)

1 Scope

This Standard specifies the general requirements, testing methods, comparison specimen, testing equipment and commissioning of the method for ultrasonic testing of clad steel plates; the evaluation and classification of the unbounded portion, and etc.

This Standard is applicable to test for combination quality of clad surface between explosive welding clad steel plate and the rolling clad steel plate with substrate thickness of more than 4mm. The ultrasonic testing of the clad steel plate with other specifications can also refer to this Standard.

2 Normative References

The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this Standard.

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 Surface of the tested plate is required to be flat, smooth, uniformly thick, and not to have liquid droplets, grease, corrosion, or other contaminants.

3.2 Internal texture of the tested plate is required not to generate the interference echo that may influence the test during the testing process.

3.3 Testing site is required to avoid the bright light, strong magnetic field, strong vibration, corrosive gas, severe dust, the factors of which may influence the stability of ultrasonic flaw detector, and the reliable observation of the testing personnel.

3.4 Plate's ultrasonic testing personnel is required to hold the Level I and above qualification certificate of ultrasonic flaw detection, while the personnel signing the >100 Difference with substrate thickness of clad steel plate is no more than ±20%

6 Testing Equipment and Commissioning

8 Evaluation of Results

The classification evaluation shall be implemented as per the test results of the clad steel plate; the supplier can treat or maintain the disqualified clad steel plate, re-test after the maintenance; only when it is tested qualified, can it be conducted for classification evaluation.

9 Test Report

Test report shall contain the following contents.

a) Model, specification, thickness and quantity;

b) Flaw detector model, probe type and specification, and testing surface;

c) Testing standard, and sensitivity determination method;

d) Test results, and classification;

e) Test date, signatures from the operator and personnel signing the report, and etc. […]