GB/T 34370.7-2020 PDF English

GB/T34370.7-2020 (GBT34370.7-2020): PDF in English

GB/T 34370.7-2020 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 97.200.40 Y 57 Nondestructive Testing of Amusement Equipment - Part 7: Eddy Current Testing ISSUED ON: NOVEMBER 19, 2020 IMPLEMENTED ON: JUNE 1, 2021 Issued by: State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of Contents Foreword ... 4 1 Scope ... 5 2 Normative References ... 5 3 Terms and Definitions ... 6 4 Method Summary ... 6 5 Safety Requirements ... 6 6 Personnel Requirements ... 7 7 General Requirements for Testing Equipment ... 7 7.1 Testing System ... 7 7.2 Testing Instruments ... 8 7.3 Testing Coil ... 8 7.4 Auxiliary Testing Equipment ... 8 8 Test Pieces ... 8 8.1 Standard Test Piece ... 8 8.2 Comparative Test Piece ... 9 9 Testing Process Procedures ... 9 9.1 General Testing Process Procedures ... 9 9.2 Testing Process Card ... 10 10 Eddy Current Testing of Component Base Metal Placement Coils ... 11 10.1 Object Under Test ... 11 10.2 Testing Requirements ... 11 10.3 Eddy Current Testing System ... 11 10.4 Testing Procedures ... 13 10.5 Identification and Analysis of Response Signals ... 15 10.6 Evaluation of Testing Results ... 15 11 Eddy Current Testing of Component Weld Placement Coils ... 16 11.1 Object under Test ... 16 11.2 Preparation before Testing ... 16 11.3 Testing Equipment ... 17 11.4 Calibration Test Block ... 19 11.5 Testing Procedures ... 20 11.6 Evaluation and Processing of Testing Results ... 21 12 Eddy Current Testing of Pipe Through Coils ... 26 13 Measurement of Covering Layer Thickness ... 27 13.1 Magnetic Method ... 27 13.2 Eddy Current Method ... 29 14 Evaluation of Testing Results ... 31 14.1 Signal Analysis ... 31 14.2 Evaluation and Processing of Testing Results ... 31 15 Testing Record and Report ... 32 15.1 Testing Record ... 32 15.2 Testing Report ... 32 Nondestructive Testing of Amusement Equipment - Part 7: Eddy Current Testing 1 Scope This Part of GB/T 34370 specifies the eddy current testing and covering layer thickness measurement method for amusement equipment. This Part is applicable to the eddy current testing of base metal and weld surface and near- surface defects of metal components of amusement equipment. 2 Normative References The following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 5126 Eddy Current Inspection Method for Cold Drawn Thin Wall Tubes of Aluminum and Aluminum Alloy GB/T 5248 Electromagnetic (eddy-current) Examination of Copper and Copper Alloy Seamless Tube GB/T 7735 Automated Eddy Current Testing of Seamless and Welded (except submerged arc- welded) Steel Tubes for Detection of Imperfections GB/T 12604.6 Non-destructive Testing - Terminology - Eddy Current Testing GB/T 12969.2 Method of Eddy Current Inspection for Titanium and Titanium Alloy Tubes GB/T 14480.3 Non-destructive Testing Instruments - Equipment for Eddy Current Examination - Part 3: System Characteristics and Verification GB/T 20306 Amusement Devices Terminology GB/T 20737 Non-destructive Testing - General Terms and Definitions GB/T 23601 Method of Eddy Current Testing for Titanium and Titanium Alloy Bars and Wires GB/T 30565 Non-destructive Testing - Eddy Current Testing - General Principles GB/T 34370.1 Nondestructive Testing of Amusement Equipment - Part 1: General Requirement GB/T 34370.3 Nondestructive Testing of Amusement Equipment - Part 3: Magnetic Particle process include at least: a) Testing personnel shall abide by the on-site safety requirements of the equipment under test, and in accordance with the requirements of the testing location, wear protective work clothes and relevant protective equipment; b) Care shall be taken to avoid various safety hazards, such as: bruises, electric shock, falling, squeezing, shearing, entanglement, slipping, drowning and burns, etc.; c) Current short circuit may cause electric shock, thereby causing harm to the human body; d) The temperature and relative humidity of the testing site may cause harm to the human body and testing instruments and equipment; e) There shall be no magnetic fields, vibrations, corrosive gases and other interference near the testing site that may affect the normal operation of the instruments and equipment. 6 Personnel Requirements The personnel engaged in eddy current testing of amusement equipment shall comply with the relevant regulations of GB/T 34370.1. 7 General Requirements for Testing Equipment 7.1 Testing System 7.1.1 The eddy current testing system generally includes eddy current testing instrument, testing coil and auxiliary device. 7.1.2 The eddy current testing system shall be able to excite the testing coil with an alternating signal of appropriate frequency and be able to sense and process the response of the testing coil to changes in the electromagnetic characteristics of the object under test. 7.1.3 The performance of the eddy current testing system shall satisfy the requirements of this Part and relevant standards. The test items and test methods related to the instrument performance shall comply with the relevant requirements of GB/T 14480.3. 7.1.4 The testing capability shall satisfy the requirements determined by product acceptance standards or technical contracts. 7.1.5 Under the following circumstances, a comparative test block shall be used to check and re-test the sensitivity of the eddy current testing system: a) Before and after every testing; b) When it is suspected that the testing system is not normally operating; c) When the specifications of the object under test change; d) During continuous testing, check and re-test once every 2 hours; e) When the parties to the contract have disputes or deem it necessary. 7.1.6 The edge effect influence zone shall satisfy the relevant requirements of product acceptance standards or technical contracts. 7.2 Testing Instruments 7.2.1 The eddy current testing instrument shall generally have the functions of excitation, amplification, signal processing, signal display, audible and visual alarms, and signal output. 7.2.2 The testing instrument shall have the function of displaying the amplitude and phase of the testing signal. The excitation frequency adjustment and gain range of the instrument shall satisfy the testing requirements. 7.2.3 The testing instrument shall be able to promptly and accurately record the output signal of the testing coil. 7.3 Testing Coil The form of the testing coil and relevant parameters shall be compatible with the testing instrument used, the object under test and the testing requirements. 7.4 Auxiliary Testing Equipment 7.4.1 The magnetizing device shall be able to continuously perform saturation magnetization on the workpiece under test or part of it. If the workpiece under test is not allowed to have residual magnetism, a demagnetization device shall also be equipped. 7.4.2 The mechanical transmission device shall be able to ensure smooth relative movement in a prescribed mode between the workpiece under test and the testing coil and shall not cause surface damage to the workpiece under test. 8 Test Pieces 8.1 Standard Test Piece 8.1.1 The standard workpiece is used to test the performance of the eddy current instrument. 8.1.2 The artificial grooves and materials of the standard workpiece shall respectively comply with the corresponding provisions of this Part. l) Auxiliary devices (magnetic saturation device, mechanical transmission device, recording device and demagnetization device, etc.); m) Evaluation and grading of testing results; n) Testing record and report format; o) Data archiving; p) Signatures of preparation (level), auditing (level) and approving personnel, and dates. 9.2 Testing Process Card For eddy current testing of various workpieces, in accordance with the actual situation, GB/T 34370.1, this Part and the general testing process procedures, formulate the eddy current testing process card. The content of the testing process card shall at least include: a) Process card No.; b) Implemented standard and quality level requirements; c) Information of the workpiece under test: name, model, serial No., material, specifications and dimensions, thermal treatment state and welding type, etc.; d) Testing equipment: name, specifications, model and serial No., etc.; e) Probe, transmission device, comparative test block specifications and artificial defect dimensions, performance inspection items, timing and performance indicators; f) Testing process parameters: including probe parameter size and model; g) Instrument settings, such as: main frequency of testing, gain, phase and filtering, etc.; h) Timing of testing; i) Testing area and surface requirements; j) Schematic diagram of testing parts; k) Testing ratio; l) Requirements of testing environment; m) Regulations of testing identification; n) Testing operating procedures and scanning sequences; o) Specific requirements for testing records, testing diagrams and data evaluation; p) Signatures of preparation (level) and auditing (level) personnel, and dates. 10 Eddy Current Testing of Component Base Metal Placement Coils 10.1 Object Under Test The object under test is regular or irregular structural parts and base materials made of metal, including flat plates with a thickness of 3 mm and above, pipes with a diameter of 30 mm  a wall thickness of 3 mm and above, and rods with a diameter of 12 mm and above. 10.2 Testing Requirements 10.2.1 The area under test shall be free of grease, oil, rust or other substances that may hinder testing; there shall be no magnetic .......
Source: https://www.ChineseStandard.net/PDF.aspx/GBT34370.7-2020