Foreword
Codeofchina com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This document is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.
This document is Section 6 of NB/T 47018 under the general title Specification of welding materials for pressure equipment. The following sections of NB/T 47018 have been issued:
——Section 1: General rules for procurement;
——Section 2: Electrodes for steel;
——Section 3: Steel electrodes and rods for gas shielded arc welding;
——Section 4: Electrodes and fluxes for submerged arc welding;
——Section 5: Stainless steel strip electrodes and fluxes for overlay welding;
——Section 6: Bare aluminum and aluminum-alloy welding electrodes and rods;
——Section 7: Titanium and titanium-alloy welding electrodes and rods.
This document replaces NB/T 47018.6-2011 Technical permission of welding materials for pressure equipment - Section 6: Bare aluminum and aluminum-alloy welding electrodes and rods. In addition to structural adjustment and editorial changes, the following main technical changes have been made with respect to NB/T 47018.6-2011:
a) The contents about model classification and model designation are deleted (see Clause 3 of Edition 2011);
b) The model representation method of bare aluminum welding electrodes and rods are modified in accordance with GB/T 10858, the less commonly used aluminum-alloy welding electrodes SA14009, SA14011, SA14010, SA14145, SA14643, and SA15654 are deleted, and SA15087 is added (see Table 1 hereof; Table 1 of Edition 2011);
c) The table on chemical composition requirements for bare aluminum welding electrodes and rods is deleted, and the requirements in GB/T 10858 are implemented (see 3.2.1 hereof; 4.2.1 and Table 2 of Edition 2011);
d) Welding electrodes in barrels and specific requirements are added (see 3.3.2 hereof);
e) The relaxation diameter and pitch as well as specific inspection requirements are added (see 3.5 hereof);
f) The designations of the base metals for test are changed (see Table 3 hereof; Table 3 of Edition 2011);
g) Welding electrodes and rods 2.5 mm and 4.0 mm in diameters are added (see Table 4 hereof).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This document was proposed by and is under the jurisdiction of SAC/TC 262 National Technical Committee on Boilers and Pressure Vessels of Standardization Administration of China.
The previous editions of this document are as follows:
——NB/T 47018.6-2011;
——This edition is the first revision.
Specification of welding materials for pressure equipment - Section 6: Bare aluminum and aluminum-alloy welding electrodes and rods
1 Scope
This document specifies the technical requirements, test methods, inspection rules, and product marking of bare aluminum and aluminum-alloy welding electrodes and rods.
This document is applicable to bare aluminum and aluminum-alloy welding electrodes and rods for oxygen fuel gas welding (OFW), gas tungsten arc welding (GTAW), gas metal arc welding (GMAW), and plasma arc welding (PAW) for pressure equipment.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions 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 2653-2008 Bend test methods on welded joints
GB/T 10858-2008 Aluminium and aluminium alloy wires and rods
GB/T 20975 (All parts) Methods for chemical analysis of aluminium and aluminium alloys
NB/T 47018.1-2011 Technical permission of welding materials for pressure equipment - Section 1: General rule
NB/T 47013.2-2015 Nondestructive testing of pressure equipments - Part 2: Radiographic testing
3 Technical requirements
3.1 General requirements
In addition to the requirements of GB/T 10858, bare aluminum and aluminum-alloy welding electrodes and rods for pressure equipment shall also meet those specified in NB/T 47018.1 and this document.
3.2 Inspection items and requirements
3.2.1 The physical and chemical inspection items of welding electrodes and rods shall be carried out in accordance with those specified in Table 1.
3.2.2 The chemical composition of welding electrodes and rods shall meet the requirements of GB/T 10858.
3.2.3 The radiographic testing of deposited metal of welding electrodes shall be carried out according to NB/T 47013.2-2015 and the radiographic testing level shall not be inferior to Level AB and the quality grade shall be Grade I.
3.2.4 The rods shall be inspected for bead-on-plate bead, which requires good fluidity and no splash of the molten pool, and regular shape, uniform width and height, smooth surface, no crack and no porosity of the bead.
3.2.5 The deposited metal of welding electrodes and the overlayed metal of rods shall be subjected to bend test. When the bend specimen is bent to the specified angle, any defect in the form of an opening with a single length greater than 3 mm is not allowed in any direction in the deposited metal on the stretched plane of the specimen; and any defect in the form of an opening on the edges or corners of deposited metal of the specimen may be omitted, but the length of those caused by incomplete fusion, slag inclusion or other welding defects shall be counted.
Foreword ii
1 Scope
2 Normative references
3 Technical requirements
4 Test methods and inspection rules
5 Product marking
