GB/T 17493-2018 Tubular cored electrodes for creep-resisting steels
1 Scope
This standard specifies the designations, technical requirements, test methods, retesting, and conditions of supply for tubular cored electrodes for creep-resisting steels.
This standard is applicable to tubular cored electrodes for creep-resisting steels for gas shielded arc welding (hereinafter referred to as "electrodes").
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 2652 Tensile test methods on weld and deposited metal (GB/T 2652-2008, ISO 5178:2001, IDT)
GB/T 3323 Radiographic examination of fusion welded joints in metallic materials
GB/T 3965 Determination of diffusible hydrogen in deposited metal (GB/T 3965-2012, ISO 3690:2000, MOD)
GB/T 16672 Welds - Working positions - Definitionsof angles of slope and rotation (GB/T 16672-1996, Idt ISO 6947:1990)
GB/T 18591 Welding - Guidance on the measurement ofpreheating temperature,interpass temperatureand preheat maintenance temperature (GB/T 18591-2001, idt ISO 13916:1996)
GB/T 25774.1 Test methods for welding consumables - Part 1 : Preparation and testing of deposited metal specimensfor 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 14344:2010, MOD)
ISO 17145 Welding consumables-Gases and gas mixtures for fusion welding and allied processes
3 Designations
3.1 Classification
The classification of electrodes is based on factors such as the mech anical properties of the deposited metal, usability characteristics, welding position, shielding gas type, and chemical composition of the deposited metal. For a comparation of tubular cored electrode designations between this standard and other relevant standards, see Annex C.
3.2 Designation classification means
The designation is divided into six parts:
1) The first part: T indicates a tubular cored electrode;
2) The second part: tensile strength property designation of the deposited metal, see Table 1;
3) The third part: the usability characteristic designation, see Table 2;
4) The fourth part: the welding position designation, see Table 3;
5) The fifth part: the shielding gas designation, which shall comply with ISO 14175, see Annex D;
6) The sixth part: the classification of the chemical composition of deposited metal, see 4.3; for the classification explaination, see Annex E.
In addtion to the compulsory sections above, optional section may be added thereafter:
Diffusible hydrogen designation "HX", where "X" may be the number 15, 10, or 5, representing the maximum value of diffusible hydrogen content (mL) per 100g of deposited metal, see 4.6.
Examples of electrode designation in this standard are as follows:
Example 1:
Example 2:
Table 1 Tensile strength designations of deposited metal
Tensile strength designation Tensile strength Rm MPa
49 490~ 660
55 550~ 690
62 620~ 760
69 690~ 830
Table 2 Designations of usability characteristics
Designation of usability characteristics Shielding gas Current type Transfer of droplet Type of core
Welding position a Characteristics
T1 Required dc (+) Spray type
Rutile 0 or 1 Low spatter loss, flat toslightly convex bead, andhigh deposition rates
T5
Required
dc (+) or dc (-)
Globular type
Lime-fluo-ride
0 or 1 Slightly convex bead, a thin slag without completely covering the weld bead, good impact properties, and hot and cold crack resistance
T15 Required dc (+) Very fine droplet spray type Metal 0 or 1 Core consisting of metal alloys and iron powder and low slag cover
TG As agreed between purchaser and supplier
Note: A description of the usability characteristics of the electrodes is given in Annex F.
a See Table 3.
Table 3 Symbol for welding position
Symbol Welding positions a
0 PA, PB
1 PA, PB, PC, PD, PE, PF and / or PG
a for the Welding positions, see GB/T 16672. PA= Flat position,PB= Horizontal vertical position, PC= Horizontal position, PD= Horizontal overhead position, PE= Overhead position, PF= Vertical up position, PG=Vertical down position
4 Technical requirements
4.1 Dimensions and surface quality of electrode
The dimensions and surface quality of electrode shall comply with GB/T 25775.
4.2 T-joint fillet weld
4.2.1 The inspection of the fillet weld test piece shall be carried out in accordance with the provisions of GB/T 25774.3, wherein the length of lack of fusion at the root of the weld shall not exceed 20% of the total length of the weld.
4.2.2 The weld convexity and the difference in leg length shall comply with the provisions of Table 4.
Contents
Foreword I
1 Scope
2 Normative references
3 Designations
4 Technical requirements
5 Test method
6 Retests
7 Technical delivery conditions
Annex A (Informative) Comparison table
Annex B (Informative) Technical deviations between this standard and ISO 17634:2015 and their justifications
Annex C (Informative) Comparison of designations of electrodes
Annex D (Informative) Symbols for shielding gas types
Symbols for shielding gas types
Annex E (Informative) Description of classification of composition designations
Annex F (Informative) Description of usability characteristics of electrodes
Annex G (Informative) Description of diffusible hydrogen
GB/T 17493-2018 Tubular cored electrodes for creep-resisting steels
1 Scope
This standard specifies the designations, technical requirements, test methods, retesting, and conditions of supply for tubular cored electrodes for creep-resisting steels.
This standard is applicable to tubular cored electrodes for creep-resisting steels for gas shielded arc welding (hereinafter referred to as "electrodes").
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 2652 Tensile test methods on weld and deposited metal (GB/T 2652-2008, ISO 5178:2001, IDT)
GB/T 3323 Radiographic examination of fusion welded joints in metallic materials
GB/T 3965 Determination of diffusible hydrogen in deposited metal (GB/T 3965-2012, ISO 3690:2000, MOD)
GB/T 16672 Welds - Working positions - Definitionsof angles of slope and rotation (GB/T 16672-1996, Idt ISO 6947:1990)
GB/T 18591 Welding - Guidance on the measurement ofpreheating temperature,interpass temperatureand preheat maintenance temperature (GB/T 18591-2001, idt ISO 13916:1996)
GB/T 25774.1 Test methods for welding consumables - Part 1 : Preparation and testing of deposited metal specimensfor 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 14344:2010, MOD)
ISO 17145 Welding consumables-Gases and gas mixtures for fusion welding and allied processes
3 Designations
3.1 Classification
The classification of electrodes is based on factors such as the mech anical properties of the deposited metal, usability characteristics, welding position, shielding gas type, and chemical composition of the deposited metal. For a comparation of tubular cored electrode designations between this standard and other relevant standards, see Annex C.
3.2 Designation classification means
The designation is divided into six parts:
1) The first part: T indicates a tubular cored electrode;
2) The second part: tensile strength property designation of the deposited metal, see Table 1;
3) The third part: the usability characteristic designation, see Table 2;
4) The fourth part: the welding position designation, see Table 3;
5) The fifth part: the shielding gas designation, which shall comply with ISO 14175, see Annex D;
6) The sixth part: the classification of the chemical composition of deposited metal, see 4.3; for the classification explaination, see Annex E.
In addtion to the compulsory sections above, optional section may be added thereafter:
Diffusible hydrogen designation "HX", where "X" may be the number 15, 10, or 5, representing the maximum value of diffusible hydrogen content (mL) per 100g of deposited metal, see 4.6.
Examples of electrode designation in this standard are as follows:
Example 1:
Example 2:
Table 1 Tensile strength designations of deposited metal
Tensile strength designation Tensile strength Rm MPa
49 490~ 660
55 550~ 690
62 620~ 760
69 690~ 830
Table 2 Designations of usability characteristics
Designation of usability characteristics Shielding gas Current type Transfer of droplet Type of core
Welding position a Characteristics
T1 Required dc (+) Spray type
Rutile 0 or 1 Low spatter loss, flat toslightly convex bead, andhigh deposition rates
T5
Required
dc (+) or dc (-)
Globular type
Lime-fluo-ride
0 or 1 Slightly convex bead, a thin slag without completely covering the weld bead, good impact properties, and hot and cold crack resistance
T15 Required dc (+) Very fine droplet spray type Metal 0 or 1 Core consisting of metal alloys and iron powder and low slag cover
TG As agreed between purchaser and supplier
Note: A description of the usability characteristics of the electrodes is given in Annex F.
a See Table 3.
Table 3 Symbol for welding position
Symbol Welding positions a
0 PA, PB
1 PA, PB, PC, PD, PE, PF and / or PG
a for the Welding positions, see GB/T 16672. PA= Flat position,PB= Horizontal vertical position, PC= Horizontal position, PD= Horizontal overhead position, PE= Overhead position, PF= Vertical up position, PG=Vertical down position
4 Technical requirements
4.1 Dimensions and surface quality of electrode
The dimensions and surface quality of electrode shall comply with GB/T 25775.
4.2 T-joint fillet weld
4.2.1 The inspection of the fillet weld test piece shall be carried out in accordance with the provisions of GB/T 25774.3, wherein the length of lack of fusion at the root of the weld shall not exceed 20% of the total length of the weld.
4.2.2 The weld convexity and the difference in leg length shall comply with the provisions of Table 4.
Contents of GB/T 17493-2018
Contents
Foreword I
1 Scope
2 Normative references
3 Designations
4 Technical requirements
5 Test method
6 Retests
7 Technical delivery conditions
Annex A (Informative) Comparison table
Annex B (Informative) Technical deviations between this standard and ISO 17634:2015 and their justifications
Annex C (Informative) Comparison of designations of electrodes
Annex D (Informative) Symbols for shielding gas types
Symbols for shielding gas types
Annex E (Informative) Description of classification of composition designations
Annex F (Informative) Description of usability characteristics of electrodes
Annex G (Informative) Description of diffusible hydrogen
