1 Scope
This Standard specifies requirements for classification and type, technical specifications, test methods, inspection rules, packing, marking and quality certificate of covered electrodes for stainless steels.
This Standard is applicable to the covered electrodes for stainless steels with a chromium content of deposited metal greater than 11%.
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 referenced document (including any amendments) applies.
GB/T 1954 Method for Measurement for Ferrite Content in austenitic Cr-Ni Stainless Steel Weld Metals (GB/T 1954-2008, ISO 8249:2000, MOD)
GB/T 2652 Tensile Test Methods on Weld and Deposited Metal (GB/T 2652-2008, ISO 5178:2001, IDT)
GB/T 4334 Corrosion of Metals and Alloys — Test Methods for Intergranular Corrosion of Stainless Steel (GB/T 4334-2008, ISO 3651-1:1998, ISO 3651-1:1998, MOD)
GB/T 16672 Welds — Working Positions — Definitions of Angles of Slope and Rotation (GB/T 16672-1996, ISO 6947:1993, IDT)
GB/T 20878 Stainless and Heat-resisting Steels — Designation and Chemical Composition
GB/T 25774.1 Test Methods for Welding Consumables — Part 1: Preparation and Testing of Deposited Metal Specimens for Mechanical Properties in Steel Nickel and Nickel alloys (GB/T 25774.1-2010, ISO 15792-1:2000, MOD)
GB/T 25774.3 Test Methods for Welding Consumables — Part 3: Preparation and Testing of a Fillet Weld Specimens for T-joint (GB/T 25774.3-2010, ISO 15792-3:2000, IDT)
GB/T 25775 Technical Delivery Conditions for Welding Consumables - Type of Product Dimensions Tolerances and Markings (GB/T 25775-2010, ISO 544:2003, MOD)
GB/T 25777 Preparation Methods of Deposited Metal Specimens for Chemical Analysis (GB/T 25777-2010, ISO 6847:2000, IDT)
GB/T 25778 Procurement Guidelines for Welding Consumables (GB/T 25778-2010, ISO 14344:2002, MOD)
3 Type
3.1 Classification of types
Electrode types shall be classified according to the chemical composition of deposited metal, welding position and type of electrode covering. For the brief description of type of electrode covering, see Appendix A. For the type comparison between different standards, see Appendix B.
3.2 Type-compiling method
Electrode type is composed of the following four parts:
a) Part 1: covered electrode is expressed as letter "E";
b) Part 2: chemical composition classification of deposited metal is expressed as the digitals behind the letter "E"; letter "L" behind the digitals indicates low carbon content; letter "H" indicates high carbon content. For the chemical composition with other special purpose, such chemical composition can be expressed as symbol of element (put behind), see Table 1.
c) Part 3: welding position is expressed as the first digit behind short dash "-", see Table 2;
d) Part 4: the type of electrode covering and current can be expressed as the last digit, see Table 3.
3.3 Type example
The demonstration of a complete electrode type in this Standard is shown as follows:
