1 Scope
This document specifies the model, technical requirements, test methods, re inspection and supply technical conditions of welding rods and wires for cast iron.
This document is applicable to welding rods for arc welding of cast iron, flux cored wires for self shielded and gas shielded arc welding, solid welding wires and filler wires for gas shielded arc welding, and cast filler wires for gas welding (hereinafter referred to as "welding rods and welding wires").
2 Normative References
The contents in the following documents, through normative references, constitute indispensable provisions of this document. Among them, only the version corresponding to the date of reference is applicable to this document; For undated references, the latest version (including all amendments) is applicable to this document.
GB/T 2652 Tensile Test Method for Welds and Deposited Metals (GB/T 26522008,1SO 51782001, IDT)
GB/T 25774.1 Inspection of Welding Materials - Part 1: Preparation and Inspection of Mechanical Properties Test Specimens of Steel, Nickel and Alloy Deposited Metals (GB/T25774.1-2010. ISO 15792-1; 2000. MOD)
GB/T 25775 Technical Conditions for Supply of Welding Materials Product Types, Dimensions, Tolerances and Markings (GB/T 25775-2010, ISO 544: 2003. MOD)
GB/T 25776 Evaluation Method for Welding Procedure Performance of Welding Materials
GB/T 25777 Preparation of Test Specimens for Chemical Analysis of Deposited Metals of Welding Materials (GB/T 25777-2010,1SO 6847, 2000, IDT)
GB/T25778 Guide for Procurement of Welding Materials (GB/T 25778-2010,1SO 14344; 2010, MOD)
GB/T 39,255 Shielding Gases for Welding and Cutting (GB/T 39,255-2020,1SO 14,175:2008, MOD)
3 Terms and definitions
There are no terms and definitions to be defined in this document,
4 Model
4.1 Model division
4.1.1 General
Welding rods and wires for cast iron shall be classified according to the homogeneity or heterogeneity of weld metal and base metal. See Appendix C for instructions. See Appendix D for the comparison between this document and the model of welding rod and wire in other relevant standards.
Note 1: The weld metal and base metal are homogeneous, which refers to the cast iron weld metal. Its chemical composition, microstructure, mechanical properties and weld color are similar to those of the base metal. Note 2: Heterogeneity between weld metal and base metal refers to pure iron, non alloy steel or alloy steel, nickel and nickel alloy weld metal.
4.1.2 Homogeneous welding rods and wires
Welding rods and wires with the same quality of weld are classified according to alloy type, as shown in Table 1 and 5.3.1
4.1.3 Heterogeneous welding rods and wires
See 5.3.2 for the classification of heterogeneous welding rods and wires according to chemical composition.
4.2 Model preparation method
4.2.1 Welding rod
The electrode model consists of three parts:
a) Part I: the letter "E" refers to the electrode for arc welding; b) Part II: the letter "C" refers to the welding of cast iron
c) Part III; Indicates the type or chemical composition classification of the deposited metal alloy (see 5.3.1, 5.3.2).
In addition to the above mandatory codes, optional codes and numerical codes can be added to indicate the deposition efficiency current type, as shown in Table 2. Examples of electrode types are as follows.
4.2.2 Flux cored wire
The model of flux cored wire consists of four parts:
A) Part I: The letter "T" indicates flux cored wire for self shielded and gas shielded arc welding; b) Part II: The letter "C" is used for welding of cast iron
c) Part III: Indicates the type or chemical composition classification of deposited metal alloy (see 5.3.1, 5.3.2);
d) Part IV; It represents the type code of protective gas, the code of self protection is "N", and the type code of protective gas is in accordance with GB/T39255
Provisions of.
In addition to the above mandatory codes, optional codes can be added; Numerical code, indicating deposition efficiency, see Table 2. Examples of flux cored wire models are shown below.
5 Technical Requirements
5.1 Dimensions
5.1.1 The size of cold drawn core electrode, flux cored wire, solid wire and filler wire shall comply with GB/T 25775. 5.1.2 The limit deviation of the diameter of the welding rod with cast core shall be ± 0.3 mm
5.1.3 The limit deviation of the diameter of the round cross-section and the side length of the square cross-section of the casting filler wire shall be ± 0.8 mm. 5.2: external mass
5.2.1 Welding rod
The external quality of welding rod shall comply with GB/T 25775 and the following provisions.
5.2.2 Flux cored wire, solid wire and filler wire
The external quality of flux cored wire, solid wire and filler wire shall comply with GB/T25775.
5.2.3 Casting filler wire
The external quality requirements of casting filler wire are as follows:
a) The surface shall be smooth and clean, free of cracks, pores, slag inclusions and other defects affecting the welding quality, as well as oxide skin, oil stain and other dirt; b) The fracture shall be free of cracks, pores and slag inclusions that may affect the welding quality.
5.3 Chemical composition
5.3.1 Homogeneous welding rods and wires
The chemical composition of deposited metal of welding rod and flux cored wire with the same quality of weld and the chemical composition of casting filler wire shall comply with the provisions in Table 4.
5.4 Welding process performance
5.4.1 The welding rod shall be easy to strike the arc, and the arc burning shall be stable during the welding process, without excessive spatter. The coating shall be melted evenly without falling off, easy to deslagging and good weld formation. If the number code indicating electrode deposition efficiency current type is added to the model, it shall comply with the provisions in Table 2.
5.4.2 Flux cored wire, solid wire and filler wire shall have stable arc, good weld formation, stable wire feeding and less spatter. If the number code indicating the deposition efficiency of flux cored wire is added to the model, it shall comply with the provisions in Table 2.
5.4.3 The casting filler wire shall be melted evenly, with good molten iron fluidity and weld formation. 5.5 Mechanical properties of deposited metal
The mechanical property requirements of deposited metal of welding rod and welding wire shall be determined by both parties through negotiation.
Note 1: The mechanical properties and microstructure of weld homogenous are basically consistent with that of base metal, mainly depending on preheating temperature, welding thermal process and cooling rate
Mechanical properties of baked metal are not required.
Note 2: The mechanical properties of weld heterogeneity are usually described by tensile properties. Appendix E provides reference values for tensile properties of deposited metal,
6 Test method
6.1 Dimensions
Measuring tools with an accuracy of 0.01 mm shall be used for diameter inspection, and they shall be measured at the same position in the direction of mutual mechanical straightness. The measuring positions shall not be less than two. The length of straight filler wire shall be measured with a measuring tool with an accuracy of 1 mm
6.2 External quality
The external quality of welding rods and wires shall be visually inspected according to the requirements of GB/T 25775An5.2. Any suitable method can be used for electrode eccentricity test.
6.3 Chemical analysis
6.3.1 The deposited metal chemical composition analysis sample of electrode and flux cored wire can be prepared from any suitable deposited metal sample. During arbitration test, it shall be prepared in accordance with GB/T25777 and Table 6, and the interpass temperature shall not be greater than 150 ℃
6.3.2 For chemical composition analysis of solid welding wire, filler wire and cast filler wire, samples shall be taken from the finished welding wire,
6.3.3 Any suitable analysis method can be used for chemical composition analysis. The arbitration test shall be conducted according to the analysis method confirmed by both parties,
6.4 Welding process performance
6.4.1 The process performance test of your electrode and flux cored wire can be conducted in the process of surfacing chemical composition samples or preparing tensile samples (if necessary), or separately in the flat welding position of the test panel. Observe the melting of the electrode and flux cored wire and the formation of the weld bead, remove the slag after cooling, and check the weld surface quality. The deposition efficiency test shall be conducted according to GB/T25776.
6.4.2 The process performance test of casting filler wire can be conducted on the cast iron test plate to observe the melting, fluidity and weld formation of welding wire.
6.4.3 The process performance test of solid welding wire and filler wire can be conducted during the preparation of tensile specimen (if necessary), or separately on the flat welding position of the test panel, to observe the weld bead formation and weld surface quality.
6.5 Mechanical properties of deposited metal
6.5.1 The test pieces for the mechanical properties of welding rods, flux cored wires, solid wires and filler wires with different welding seams shall be prepared according to GB/T 25774.1. The test piece type shall be 1.3, and the width of the test plate shall not be less than 125 mm
6.5.2 The sampling position and size of the deposited metal tensile specimen shall comply with GB/T25774.1. 6.5.3 Tensile test shall be conducted according to GB/T 2652.
7 Re inspection
If any item fails to pass the inspection, double the re inspection. The results of double reinspection stations shall meet the inspection requirements. The retest sample can be cut from the original test piece, or made from a new test piece prepared by using the same type of welding materials and the same welding procedure. When reinspecting the tensile test, the tensile strength, yield strength and elongation after fracture are also taken as reinspection items. For chemical analysis, only those elements that do not meet the requirements shall be rechecked.
If the double reinspection fails to meet the requirements of this inspection once, the material is judged as unqualified.
During or after the test, if the qualification test is not conducted according to the provisions, the test is invalid and shall be conducted again according to the provisions. In this case, it is not required to double
8 Technical Conditions of Supply
The technical conditions of supply shall meet the requirements of GB/T 25775 and GB/T 25778.
Appendix A (informative) Comparison between this document and ISO 1071:2015 structure number
Appendix B (informative) This document and ISO 1071; Technical differences and reasons in 2015
Appendix C (Informative) Instructions for Use of Welding Rods and Wires
Appendix D (informative) Model comparison of welding rod and wire
Appendix E (informative) Tensile Properties of Welding Rods with Heterogeneous Welds and Deposited Metals of Welding Wires
Bibliography
1 Scope
2 Normative References
3 Terms and definitions
4 Model
5 Technical Requirements
6 Test method
7 Re inspection
8 Technical Conditions of Supply
The technical conditions of supply shall meet the requirements of GB/T 25775 and GB/T 25778.
Appendix A (informative) Comparison between this document and ISO 1071:2015 structure number
Appendix B (informative) This document and ISO 1071; Technical differences and reasons in 2015
Appendix C (Informative) Instructions for Use of Welding Rods and Wires
Appendix D (informative) Model comparison of welding rod and wire
Appendix E (informative) Tensile Properties of Welding Rods with Heterogeneous Welds and Deposited Metals of Welding Wires
Bibliography
