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NB/T 47018.6-2011 English PDF (NBT47018.6-2011)

NB/T 47018.6-2011 English PDF (NBT47018.6-2011)

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NB/T 47018.6-2011: Technical permission of welding materials for pressure equipment. Section 6: Bare aluminum and aluminum-alloy welding electrodes and rods

This Section of NB/T 47018 specifies the model preparation, technical requirements, test methods and inspection rules of bare aluminum and aluminum-alloy welding electrodes and rods. This Section is applicable to the bare aluminum and aluminum-alloy welding electrodes and rods used for the gas welding, gas tungsten arc welding, gas metal arc welding and plasma arc welding of pressure equipment.
NB/T 47018.6-2011
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 25.160.10
J 33
Technical Permission of Welding Materials for
Pressure Equipment - Section 6: Bare Aluminum and
Aluminum-alloy Welding Electrodes and Rods
ISSUED ON: JULY 1, 2011
IMPLEMENTED ON: OCTOBER 1, 2011
Issued by: National Energy Administration of the People's Republic of
China
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Model ... 4
4 Technical Requirements ... 5
5 Test Methods and Inspection Rules ... 9
6 Identification ... 14
Foreword
NB/T 47018-2011 "Technical Permission of Welding Materials for Pressure Equipment?€? is divided into 2 Sections [Translator note: should be 7 Sections]: - Section 6: Bare Aluminum and Aluminum-alloy Welding Electrodes and
Rods;
- Section 7: Titanium and Titanium-alloy Welding Electrodes and Rods.
This is the Section 6 of NB/T 47018.
This Section was proposed by and shall be under the jurisdiction of the National Technical Committee on Boilers and Pressure Vessels of Standardization
Administration of China (SAC/TC 262).
Main drafting organizations and persons of this Section:
Hefei General Machinery Research Institute; Ge Zhaowen and Fang
Wunong
Bureau of Safety Supervision of Special Equipment of General
Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Chang Yanyan
Participating drafting organizations and persons for this Section:
Central Research Institute of Building and Construction Co., Ltd, MCC Group; Tang Bogang
Advanced Technology and Materials Co., Ltd., Central Iron & Steel Research Institute; Li Jifu
Well Welding Co., Ltd., Harbin Welding Institute; Xu Kai
Atlantic China Welding Consumables, Inc.; Chen Yigang
Tianjin Golden Bridge Welding Materials Group Co., Ltd.; Hou Yongtai
Kunshan Gintune Welding Co., Ltd.; Zheng Yiluo
China Standardization Committee on Boilers and Pressure Vessels (SAC/TC 262) is responsible for interpretation of this Section.
Technical Permission of Welding Materials for
Pressure Equipment - Section 6: Bare Aluminum and
Aluminum-Alloy Welding Electrodes and Rods
1 Scope
This Section of NB/T 47018 specifies the model preparation, technical
requirements, test methods and inspection rules of bare aluminum and
aluminum-alloy welding electrodes and rods.
This Section is applicable to the bare aluminum and aluminum-alloy welding electrodes and rods used for the gas welding, gas tungsten arc welding, gas metal arc welding and plasma arc welding of pressure equipment.
2 Normative References
The 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 normative document (including any amendments) applies.
GB/T 2653 Bend Test Methods on Welded Joints
GB/T 10858 Aluminum and Aluminum Alloy Welding Rods and Wires
GB/T 20975 (All Parts) Methods for Chemical Analysis of Aluminum and
Aluminum Alloys
NB/T 47018.1 Technical Permission of Welding Materials for Pressure
Equipment - Section 1: General Rule
JB/T 4730.2 Nondestructive Testing of Pressure Equipment - Part 2:
Radiographic Testing
3 Model
3.1 Model division
The model of welding electrodes and rods is divided according to the chemical composition and use occasions.
4.2.2 The deposited metal radiographic testing for welding electrodes shall be carried out according to JB/T 4730.2; the radiographic testing technology shall not be lower than Grade AB and the quality grade of deposited metal is Grade I.
4.2.3 Flat piled weld inspection shall be carried out for rods; the weld pool shall be in good flowability and free from splash; the weld bead shape shall be regular and uniform in width and height; the surface shall be smooth and free from crack and pore.
4.2.4 Bend test shall be carried out for the deposited metal of welding electrodes as well as the piled metal of rods. Where the bending sample is bended to the specified angle, the deposited metal on its stretching plane shall be free from opening defect with single length longer than 3mm in any direction; the opening defect on the corner angle of deposited metal on sample shall be ignored. However, the length of opening defect on corner angle caused by the incomplete fusion, slag inclusion or other internal imperfection shall be counted. 4.3 Surface quality and uniformity of welding electrodes and rods
4.3.1 The surface of welding electrodes and rods shall be lustrous, smooth and free from burr, pit, scratch, oxide skin, crack, fold and inclusion. Polished finish should be carried out.
4.3.2 The reeled welding electrodes shall be continuous and shall ensure the uniform and continuous feeding for equipment of machine welding, semi-
automatic welding and automatic welding.
4.4 Welding electrodes in accordance with the inspection requirements may be used as rods without flat deposited weld inspection; the welding electrodes in accordance with the inspection requirements may only be used as welding electrodes after passing the deposited metal radiographic testing.
5 Test Methods and Inspection Rules
5.1 Chemical analysis
5.1.1 The chemical composition analysis of welding electrodes and rods shall be carried out according to batches.
5.1.2 The chemical composition of electrodes or rods in each batch shall meet the requirements of Table 2. Where other element is found during routine analysis, further analysis shall be carried out to determine whether its gross amount exceeds the value specified in Table 2.
Table 4 -- Positional Parameter before Welding Test Piece
5.2.4 Where there is no agreement reached between the parties, the gas
metal arc welding used for test piece shall be carried out according to the welding process documents provided by the welding material manufacturer. 5.2.5 During the initial welding and welding, the temperature of test piece shall not be lower than 16??? while the arcing and inter-pass temperature shall not be greater than 60???.
5.3 Flat piled weld inspection for rods
5.3.1 The rods shall be inspected according to batches.
5.3.2 See Table 3 for the base material used in test. As for the dimension of test piece, the width shall be greater than or equal to 150mm, the length shall be greater than or equal to 300mm, and the thickness shall meet the
requirements of Article 5.2.3.
5.3.3 Argon tungsten-arc welding shall be adopted for test piece and the AC power supply shall be weld in flat welding position. Where there is no
agreement reached between the parties, such welding shall be carried out according to the welding process documents provided by the welding material manufacturer.
5.3.4 The adopted rods which pass the argon tungsten-arc welding inspection are also applicable to gas welding and plasma arc welding.
5.4 Bend test
5.4.1 Bend test shall be carried out for welding electrodes and rods according to batches.
5.4.2 Longitudinal bending sample shall be taken from test pieces of
deposited metal radiographic testing or flat piled weld inspection for rods at the positions as shown in Figure 2. 1 face-bend sample and 1 back-bend sample shall be taken from the test piece of deposited metal radiographic testing while 2 face-bend samples shall be taken from the test piece of flat piled welding. 5.4.3 Longitudinal bending sample
5.4.3.1 Cold processing method shall be adopted for sampling. Where hot processing method is adopted for sampling, the heat affected zone shall be removed.
5.4.3.2 Welding defect and imperfection may be avoided during sample
preparation.
5.4.3.3 Sample processing:
a) the excess weld metal and base plates shall be removed through cold
processing method;
b) the stretching plane of the sample shall be processed flush and free from scratch and damage.
5.4.3.4 Sample form:
a) see Figure 3 for the longitudinal bending sample.

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