GB/T 34370.3-2017 PDF EnglishUS$145.00 · In stock · Download in 9 seconds
GB/T 34370.3-2017: Nondestructive testing of amusement equipment - Part 3: Magnetic particle testing Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 34370.3-2017: Nondestructive testing of amusement equipment - Part 3: Magnetic particle testing---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT34370.3-2017 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 97.200.40 Y 57 Nondestructive testing of amusement equipment - Part 3.Magnetic particle testing Issued on. SEPTEMBER 29, 2017 Implemented on. APRIL 01, 2018 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 3 1 Scope... 4 2 Normative references... 4 3 Terms and definitions... 5 4 Method summary... 6 5 Safety requirements... 7 6 Personnel requirements... 8 7 Testing equipment and apparatus... 8 8 Testing process procedures... 13 9 Testing... 14 10 Retesting... 22 11 Demagnetization... 22 12 Magnetic particle testing quality grading... 23 13 Magnetic particle testing report... 24 Annex A (informative) Waveform of various magnetizing electric currents, ammeter indication and conversion relationship... 26 Annex B (informative) Typical magnetization methods for welds... 27ForewordGB/T 34370 “Nondestructive testing of amusement equipment” consists of the following 6 parts. - Part 1.General requirement; - Part 2.Visual examination; - Part 3.Magnetic particle testing; - Part 4.Penetrant testing; - Part 5.Ultrasonic testing; - Part 6.Radiographic testing. This Part is Part 3 of GB/T 34370. This Part is drafted in accordance with the rules given in GB/T 1.1-2009. This Part was proposed and shall be under the jurisdiction of National Technical Committee on Cableway and Amusement Equipment of Standardization Administration of China (SAC/TC 250). Drafting organizations of this Part. China Special Equipment Inspection and Research Institute, Hebei Special Equipment Supervision and Inspection Institute, Jining Luke Testing Equipment Co., Ltd., Shandong Kejie Engineering Testing Co., Ltd., Hebei University, Beijing Shibaolai Amusement Equipment Co., Ltd. Main drafters of this Part. Shen Gongtian, Wu Zhanwen, Guo Ningchao, Hu Bin, Zhang Junjiao, Ji Weijin, Dou Quanzheng, Zhang Jinsong, Ye Chao, Wan Qiang, Liang Yumei, Wang Fang, Sun Jianxi. Nondestructive testing of amusement equipment - Part 3.Magnetic particle testing1 ScopeThis Part of GB/T 34370 specifies the yoke method, coil method and current flow method of the magnetic particle testing method and the requirements for quality grading of amusement equipment. This Part applies to the testing of defects on the surface and near surface of ferromagnetic raw materials, parts and welded joint of amusement equipment. This Part does not apply to the testing of austenitic stainless steel and other non-ferromagnetic materials.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 5097 Non-destructive testing - Penetrant testing and magnetic particle testing - Viewing conditions GB/T 11533 Standard for logarithmic visual acuity charts GB/T 12604.5 Non-destructive testing - Terminology - Terms used in magnetic particle testing GB/T 20306 Amusement devices terminology GB/T 20737 Non-destructive testing - General terms and definitions GB/T 23907 Non-destructive testing - Shims for magnetic particle testing GB/T 34370.1 Nondestructive testing of amusement equipment - Part 1. General requirement JB/T 6063 Non-destructive testing - Materials for magnetic particle testing JB/T 8290 Non-destructive testing instruments - Magnetic particle flaw detectors3 Terms and definitionsFor the purpose of this document, the following terms and definitions and those defined in GB/T 12604.5, GB/T 20306 and GB/T 20737 apply. 3.1 excessive background Magnetic particle indication background due to excessive magnetic field strength, excessive magnetic ink concentration and rough or contaminated workpiece surface, which impedes the analysis evaluation of magnetic particle indication. 3.2 relevant indication Magnetic particle indication formed by the f the flux leakage field absorbing magnetic particle due to defects (crack, incomplete fusion, porosity, slag inclusion, etc.) during magnetic particle testing is called relevant indication. It is also known as defect indication. 3.3 non-relevant indication Magnetic particle indication formed by the flux leakage field absorbing magnetic particle due to the magnetic field cross-section mutation and the difference in magnetic permeability of the material is called non-relevant indication. 3.4 false indication Magnetic particle indication that is not formed by the flux leakage field absorbing magnetic particle.4 Method summaryAfter the ferromagnetic material workpiece is magnetized, due to the presence of discontinuity,5 Safety requirementsThe safety requirements during the testing process include at least.6 Personnel requirementsFor personnel engaged in the magnetic particle testing of amusement equipment, in addition to complying with the relevant provisions of GB/T 34370.1, the magnetic particle testing personnel shall have an uncorrected or corrected visual acuity of not less than 5.0 (the decimal number is 1.0), and shall not have color blindness.7 Testing equipment and apparatus7.1 Magnetic particle testing equipment 7.1.1 Basic requirements The magnetic particle testing equipment shall comply with the provisions of JB/T 8290. 7.1.2 Power-off phase controller When using the residual magnetic field method for testing, the AC flaw detector shall be equipped with power-off phase controller. 7.1.3 Black light irradiance and wavelength When using the fluorescent magnetic particle testing, the black light (UV-A) used shall comply with the provisions of GB/T 5097, and the irradiation intensity on the surface of the workpiece to be tested shall be greater than or equal to 1000 μW/cm2.Its wavelength shall be 315 nm to 400 nm, and the peak wavelength is approximately 365 nm. 7.1.5 Auxiliary equipment Generally include the following equipment. 7.2 Magnetic particle, carrier fluid and magnetic ink 7.2.1 Magnetic particle The magnetic particle shall have high magnetic permeability, low coercivity and low residual magnetic field, and shall have a high contrast with the surface color of the workpiece to be tested. Other requirements for magnetic particle size and performance shall be in accordance with JB/T 6063. 7.2.3 Magnetic ink The concentration of the magnetic ink shall be determined according to factors such as the type, the particle size, the application method of magnetic particle, and the surface state of the workpiece to be tested. 7.3 Shims 7.3.1 Standard shims 7.3.2 Magnetic field indicator The magnetic field indicator is a rough calibration tool used to indicate whether the aspect of the magnetic field and the effective testing area on the surface of the workpiece to be tested, and the magnetization method are correct, but it cannot be used as a quantitative indication of the strength of the magnetic field 7.5 Yoke lifting power calibration The lifting power of the yoke shall be calibrated at least once every six months. It shall be re-calibrated after the yoke damage is repaired. 7.6 Auxiliary instrument calibration Auxiliary instruments for magnetic particle testing, such as black light irradiance The maximum gap is 0.88 Testing process procedures8.1 General testing process procedures Organizations engaged in the magnetic particle testing of amusement equipment shall formulate general testing process procedures in accordance with the requirements of GB/T 34370.1 and this Part, and the contents shall at least include the following elements. 8.2 Testing process card For the magnetic particle testing of each type of workpiece, the magnetic particle testing process card shall be formulated according to the actual situation and in accordance with GB/T 34370.1, this Part and the general testing9 Testing9.1 Preparation before testing 9.1.1 Data review The data review shall include the following. 9.1.2 Site survey For amusement equipment in use, before the implementation of the testing, the site where the equipment to be tested locates shall be surveyed, the auxiliary conditions for the implementation of the testing shall be determined, and all factors that may affect the testing shall be identified. The interference of these factors shall be avoided as far as possible during the testing. 9.1.3 Preparation of test process cards In accordance with 8.2. 9.1.5 Contrast aid paints To enhance contrast, contrast aid paints may be used. 9.2 Magnetizing electric current type and its selection Common types of current for magnetic particle testing are. AC, rectified current (full-wave rectification, half-wave rectification) and DC. Required by the magnetization specification, the AC magnetization current value is effective value, and the rectified current value is average value. See Annex A for the waveform of magnetizing electric current, the ammeter indication, and the conversion relationship. 9.3 Magnetization directions 9.4 Magnetization specifications 9.4.1 Yoke method 9.4.1.1 The magnetic pole spacing of the yoke should be controlled between 75 mm and 200 mm. The effective width is within 1/4 pole distance on both sides of the two-pole connection. The magnetized area shall have an overlap of not less than 10 % each time. When the magnetic pole spacing of the yoke is less than 75 mm, care shall be taken that the magnetic particle forms an non- relevant indication around the electrode. 9.4.1.2 When the workpiece is magnetized by the yoke method, its magnetizing electric current shall be selected according to the measured results of the standard shim. If the workpiece is magnetized with a fixed yoke, the measured results of the standard shim shall be used to verify whether the sensitivity meets the requirements. 9.4.2 Coil method 9.5 Testing method 9.5.1 Continuous method When the continuous method is used, the magnetization of the workpiece to be tested, the process of applying the magnetic particle, and the observation of the magnetic particle indication shall be completed within the magnetization current flow time. The current flow time is 1 s ~ 3 s, and the magnetization can be stopped after the magnetic ink is stopped being applied for at least 1 s. To ensure the magnetization effect, the magnetization shall be repeated at least twice. 9.5.2 Residual magnetic field method 9.9.3 When two or more magnetic particle indications are on the same straight line and the spacing is not more than 2 mm, it is treated as a magnetic particle indication, and its length is the sum of the two magnetic particle indications plus the spacing. 9.10 Testing record The magnetic particle testing record shall include at least the contents specified in 8.2 and Clause 13. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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