GB/T 3670-2021 English PDF (GB/T3670-2021)

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GB/T 3670-2021: Covered electordes for manual metal arc welding of copper and copper alloys
GB/T 3670-2021
Covered electordes for manual metal arc welding of copper and copper alloys
ICS 25.160.20
CCSJ33
National Standards of People's Republic of China
Replacing GB/T 3670-1995
Copper and copper alloy electrodes
Published on 2021-12-31
2022-07-01 Implementation
State Administration for Market Regulation
Released by the National Standardization Administration
directory
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Model 1
5 Technical requirements 2
6 Test method 5
7 Retest 5
8 Technical conditions of supply 5
Appendix A (Informative) Chapter Number Comparison Table 6
Appendix B (informative) Technical differences between this document and ISO 17777.2016 and their reasons7
Appendix C (Informative) Welding Rod Type Comparison 8
Appendix D (Informative) Physical Properties and Application Examples of Welding Rod 9
foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents"
drafted.
This document replaces GB/T 3670-1995 "Copper and Copper Alloy Welding Rods". Compared with GB/T 3670-1995, except for structural adjustment and editing
In addition to the sexual changes, the main technical changes are as follows.
---Retain all 12 electrode models in the original standard, re-compile the models according to ISO 17777.2016, and add
ECu1892, ECu1893, ECu5180, ECu5180B, ECu5410, ECu5210, ECu6100A, ECu6325,
11 models including ECu6328, ECu7158 and ECu6561 (see 4.2, 3.2 of the.1995 edition);
--- Deleted the technical requirements for mechanical properties (see 4.4 and 5.4 of the.1995 edition).
This document uses the redrafted method to modify the use of ISO 17777.2016 "Welding Materials Copper and Copper Alloy Electrodes Arc Welding Coated Electrodes
Classification".
Compared with ISO 17777.2016, this document has more structural adjustments. Appendix A lists this document and ISO 17777.2016.
A list of changes in chapter numbering.
There are technical differences between this document and ISO 17777.2016.Appendix B gives a description of the corresponding technical differences and their reasons.
list.
The following editorial changes have also been made to this document.
--- Modify the standard name to "Copper and Copper Alloy Welding Rod";
--- Table C.1 adds a column of "this document";
--- Removed references.
Please note that some content of this document may be patented. The issuing agency of this document assumes no responsibility for identifying patents.
This document is proposed and managed by the National Welding Standardization Technical Committee (SAC/TC55).
This document is drafted by. Harbin Welding Research Institute Co., Ltd., Shanghai Smike Welding Materials Co., Ltd., Jinzhou Special Welding Rod Co., Ltd.,
Wuhan Iron Anchor Welding Materials Co., Ltd., Kunshan Jingqun Welding Materials Technology Co., Ltd., Harbin Well Welding Co., Ltd., Hangzhou Hua
Light Welding New Materials Co., Ltd.
Drafters of this document. Song Bei, Chu Jijun, Yang Zijia, Wu Bin, Pei Kai, Bao Runxin, Tong Tianwang, Chen Bo, Jin Limei, Su Jinhua, Li Susan,
Yang Haoquan.
The previous versions of the standards replaced by this document are.
---GB/T 3670-1983, GB/T 3670-1995.
Copper and copper alloy electrodes
1 Scope
This document specifies the types, technical requirements, test methods, re-inspection and supply technical conditions of copper and copper alloy electrodes.
This document applies to copper and copper alloy electrodes (hereinafter referred to as "electrodes") whose copper content exceeds any other element content in the deposited metal.
2 Normative references
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations
documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to
this document.
GB/T 25775 Technical supply conditions for welding consumables Product types, dimensions, tolerances and markings (GB/T 25775-2010,
ISO 544.2003, MOD)
GB/T 25777 Welding Materials Method for Preparation of Specimens for Chemical Analysis of Deposited Metals (GB/T 25777-2010, ISO 6847.2000,
IDT)
GB/T 25778 Welding Consumables Procurement Guidelines (GB/T 25778-2010, ISO 14344.2010, MOD)
3 Terms and Definitions
There are no terms and definitions that need to be defined in this document.
4 models
4.1 Model division
The electrode types are classified according to the chemical composition of the deposited metal. See Appendix C for comparison of electrode types in this document and other relevant standards. welding rod
See Appendix D for relevant physical properties and application examples.
4.2 Model preparation method
The electrode model consists of two parts.
a) Part 1.Use the letter "E" to represent the electrode;
b) Part II. Use "Cu" plus 4 digits or a combination of 4 digits and letters to indicate the number of chemical composition classification of copper-based deposited metal
Character code, see 5.3.
In addition to the mandatory codes above, optional codes can be appended with parentheses after the second part.
The chemical composition code, expressed by "Cu" plus the chemical symbol and nominal content of the main added elements, see 5.3.
Examples of electrode types in this document are as follows.
5 Technical requirements
5.1 Dimensions
The size of the electrode should meet the requirements of GB/T 25775.
5.2 Drug skin
5.2.1 The coating of the electrode should be evenly and tightly wrapped around the welding core, and there should be no cracks, bubbles and impurities on the coating that affect the welding quality.
and falling off defects.
5.2.2 The coating of the arc ignition end of the electrode should be chamfered, and the end face of the welding core should be exposed. The exposed core of the electrode along the circumference should not be greater than 1/2 of the circumference. electrode length
The length of the exposed core in the direction should not be greater than 3mm.
5.2.3 The eccentricity of the electrode shall meet the requirements in Table 1.See formula (1) and Figure 1 for the calculation method of eccentricity.
5.3 Chemical composition
The chemical composition of the deposited metal shall meet the requirements in Table 2.
6 Test methods
6.1 Preparation of chemical samples
The samples for chemical composition analysis of deposited metal shall be prepared in accordance with the provisions of GB/T 25777.
6.2 Chemical composition analysis
Any suitable analytical method can be used for chemical composition analysis. The arbitration test shall be carried out according to the analysis method confirmed by both parties.
7 Retest
When any one of the inspections fails, the inspection should be doubled. For chemical analysis, retest only those elements that do not meet the requirements. its test
The sample can be taken from the original specimen, or it can be taken from the newly prepared specimen. The results of the double re-inspection shall meet the requirements of the inspection.
During the test or after the test is completed, if it can be confirmed that the test is not carried out in accordance with the regulations, the test is invalid and needs to be repeated according to the regulations.
OK. In this case, double retest is not required.
8 Technical conditions of supply
The technical conditions of supply are in accordance with the provisions of GB/T 25775 and GB/T 25778.