1 Scope
This part in JB/T 4730 specifies the magnetic particle testing methods and quality classification requirements of pressure equipments.
This part is applicable to the testing of the raw materials, spare parts and welded joint surfaces and near surface defects of those pressure equipments manufactured from ferromagnetic materials but is not applicable to the testing of the austenitic stainless steel and other non-ferromagnetic materials.
The support parts and structural member related to pressure equipments also may be carried out with magnetic particle testing by making reference to this part as required.
2 Normative References
The following normative documents contain provisions which, through reference in this part of JB/T 4730, constitute provisions of this part. For dated reference, subsequent amendments to, or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this part are encouraged to study whether the latest editions of these documents are applicable. For undated references, the latest edition of the normative document referred to applies.
Contents
Foreword I
1 Scope
2 Normative References
3 General Requirements
4 Testing methods
5 Classifications and Record of Magnetic Trace Indications
6 Retesting
7 Demagnetization
8 Magnetic Particles Testing on Pressure Equipments
9 Quality Classification of Magnetic Particle Testing
10 Magnetic Particle Testing Report
Annex A (Informative) Various Waveforms of Magnetizing Current, Ammeter Indication and Conversion Relation
Annex B (Informative) Typical Magnetization Method of Welded Joint
