GB/T 10045-2018Tubular cored electrodes for non-alloy and fine grain steels (English PDF)

Foreword

This Standard is drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard replaces GB/T 10045-2001 "Carbon steel flux cored electrodes

for arc welding". Compared with GB/T 10045-2001 "Carbon steel flux cored

electrodes for arc welding", the main content changes are as follows:

- CHANGE the standard name to "Tubular cored electrodes for non-alloy and

fine grain steels";

- According to the tensile strength range of this Standard, ADD all non-metal

powder type molybdenum-steel electrode models of GB/T 17493-2008

"Low alloy steel flux cored electrodes for arc welding", E43XT1-Ni1C,

E43XT1-Ni1M, E49XT1-Ni1C, E49XT1-Ni1M, E49XT6-Ni1, E49XT8-Ni1,

E55XT1-Ni1C, E55XT1-Ni1M, E55XT5-Ni1C, E55XT5-Ni1M, E49XT8-Ni2,

E55XT8-Ni2, E55XT1-Ni2C, E55XT1-Ni2M, E55XT5-Ni2C, E55XT5-Ni2M,

E55XT5-Ni3C, E55XT5-Ni3M, and E55XT11-Ni3 of non-metal powder type

nickel-steel electrode models, E55XT5-K1C, E55XT5-K1M, E49XT4-K2,

E49XT7-K2, E49XT8-K2, E49XT11-K2, E55XT1-K2C, E55XT1-K2M,

E55XT5-K2C, E55XT5-K2M, E55XT8-K2, E49XT5-K6C, E49XT5-K6M,

E43XT8-K6, E49XT8-K6, E55XT1-W2C, and E55XT1-W2M of non-metal

powder type other low-alloy steel electrode models, and E55C-Ni1, E49C-

Ni2, E55C-Ni2, E55C-Ni3, and E55C-W2 of metal powder type electrode

models. These models are re-developed in accordance with ISO

17632:2015. The technical requirements are adjusted;

- According to the actual production situation in China, ADD two

classifications of chemical composition: NCC2 and NCC3;

- MAKE corresponding adjustments to the requirements for model division,

mechanical properties, T-joint fillet weld, and chemical composition etc.

according to ISO 17632:2015;

- For the symbols for usability characteristics, according to ISO 17632:2015,

delete T9 and add T15;

- Delete the bending test requirements for a single-run welded joint.

This Standard uses redraft law to modify and adopt ISO 17632:2015 "Welding

consumables - Tubular cored electrodes for gas shielded and non-gas shielded

metal arc welding of non-alloy and fine grain steels - Classification".

Compared with ISO 17632:2015, this Standard has more adjustments in

structure. Annex A lists a table for comparison between the clause-subclause

Tubular cored electrodes for non-alloy and fine grain

steels

1 Scope

This Standard specifies the models, technical requirements, test methods,

retests, and technical delivery conditions, etc. of tubular cored electrodes for

non-alloy and fine grain steels.

This Standard applies to tubular cored electrodes for gas shielded and non-gas

shielded metal arc welding of non-alloy and fine grain steels with a minimum

tensile strength requirement of not more than 570 MPa (hereinafter referred to

as "electrodes").

2 Normative references

The following documents are indispensable for the application of this document.

For the dated references, only the editions with the dates indicated are

applicable to this document. For the undated references, the latest edition

(including all the amendments) are applicable to this document.

GB/T 700 Carbon structural steels (GB/T 700-2006, ISO 630:1995, NEQ)

GB/T 1591 High strength low alloy structural steels

GB/T 2650 Impact test methods on welded joints (GB/T 2650-2008, ISO

9016:2001, IDT)

GB/T 2651 Tensile test methods on welded joints (GB/T 2651-2008, ISO

4136:2001, IDT)

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 - Definitions of angles of slope and

rotation (GB/T 16672-1996, idt ISO 6947:1990)

2) The second part: Indicate the symbol for tensile strength of the deposited

metal under as-welded or post-weld heat treatment condition when used

for multi-run welding; see Table 1. Or indicate the symbol for tensile

strength of the welded joint under as-welded condition when used for

single-run welding; see Table 2;

3) The third part: Indicate the symbol for test temperature when the impact

absorbed energy (KV2) is not less than 27J; see Table 3. For electrodes

only applicable to single-run welding, this symbol is not available;

4) The fourth part: Indicate the symbol for usability characteristics; see Table

4;

5) The fifth part: Indicate the symbol for welding position; see Table 5;

6) The sixth part: Indicate the symbol for type of shielding gas. The symbol

for non-gas shielding is "N". The symbol for shielding gas shall be in

accordance with ISO 14175; see Annex D. For electrodes only applicable

to single-run welding, ADD the letter "S" after the symbol;

7) The seventh part: Indicate the symbol for post-weld state; where "A"

indicates the as-welded condition, "P" indicates the post-weld heat

treatment state, and "AP" indicates both the as-welded condition and the

post-weld heat treatment state;

8) The eighth part: Indicate the classification of chemical composition of

deposited metal; see 4.3.

In addition to the above compulsory symbols, optional symbols may be added

after them:

a) The letter "U" indicates that, at the specified test temperature, the impact

absorbed energy (KV2) shall not be less than 47J;

b) The symbol "HX" for diffusible hydrogen; where "X" may be the number

15, 10, or 5, representing the maximum (mL) of diffusible hydrogen

content per 100g of deposited metal respectively; see 4.6.

The examples of electrode model in this Standard are as follows:

5 Test methods

6 Retests

If any test fails to meet the requirement, that test shall be repeated twice. For

chemical analysis, retesting need be only for those specific elements that failed

to meet their test requirement. When the tensile test is repeated, the tensile

strength, yield strength, and percentage elongation after fracture are

simultaneously taken as retest items. The specimens may be taken from the

original test assembly or taken from the newly-welded test assembly. The

results of both retests shall meet the requirement of this item.

In the event that during preparation or after completion of any test it is clearly

Annex E

(Informative)

Description of usability characteristics of tubular cored electrodes

E.1 Electrodes having a usability designator of "T1"

These electrodes are designed for single- and multi-run welding using d.c.(+)

polarity. The larger diameters (usually 2.0 mm and larger) are used for welding

in the flat position and for welding fillet welds in the horizontal position. The

smaller diameters (usually 1.6 mm and smaller) are used for welding in all

positions. These electrodes are characterized by a spray transfer, low spatter

loss, flat to slightly convex bead contour, and a moderate volume of slag which

completely covers the weld bead. Electrodes of this classification have a rutile

base slag and produce high deposition rates.

E.2 Electrodes having a usability designator of "T2"

Electrodes of this type are similar to the "T1" types, but with higher manganese

or silicon or both and are designed primarily for single-run welding in the flat

position and for welding fillet welds in the horizontal position. These electrodes

give good mechanical properties in single-run welds. The higher levels of

deoxidizers in these classifications allow single-run welding of heavily oxidized

or rimmed steel. Weld metal composition requirements are not specified for

single-run electrodes since checking the composition of the deposited weld

metal will not provide an indication of the composition of a single-run weld.

E.3 Electrodes having a usability designator of "T3"

Electrodes of this type are self-shielded, used on d.c.(+), and have a globular-

type transfer. The slag system is designed to make very high welding speeds

possible. The electrodes are used for single-run welds in the flat, horizontal,

and vertical (up to 20° incline) positions (downward progression) on sheet metal.

Since these electrodes are sensitive to the effects of base metal quenching,

they are not generally recommended for the following:

a) T- or lap joints in materials thicker than 5 mm.

b) Butt, edge, or corner joints in materials thicker than 6 mm.

The electrode manufacturer should be consulted for specific recommendations.

E.4 Electrodes having a usability designator of "T4"

Electrodes of this type are self-shielded, operate on d.c.(-), and have a small

droplet transfer. The electrodes are used for single-run welds at high travel

speeds on material of any thickness in the flat, horizontal, and vertical (up to

20° incline) positions.

E.10 Electrodes having a usability designator of "T11"

Electrodes of this type are self-shielded, operate on d.c.(-), and have a smooth

spray-type transfer. They are general purpose electrodes for single- and multi-

run welding in all positions.

Some electrodes are designed for thin plate only. The manufacturer should be

consulted regarding any plate thickness limitations.

E.11 Electrodes having a usability designator of "T12"

These electrodes are similar in arc transfer, welding characteristics, and

deposition rates to the "T1" types. However, they have been modified to improve

impact toughness and to meet the lower manganese requirements (1.60 %

maximum). They therefore have an accompanying decrease in tensile strength

and hardness. Since welding procedures influence all weld metal properties,

users are urged to check hardness on any application where a maximum

hardness level is a requirement.

E.12 Electrodes having a usability designator of "T13"

Electrodes of this type are self-shielded and operate on d.c.(-) and are usually

welded with a short-arc transfer. The slag system is designed so that these

electrodes can be used in all positions for the root pass on circumferential pipe

welds. The electrodes can be used on all pipe wall thicknesses, but are only

recommended for the first run. They generally are not recommended for multi-

run welding.

E.13 Electrodes having a usability designator of "T14"

Electrodes of this type are self-shielded, operate on d.c.(-), and have a smooth

spray-type transfer. They are intended for single-run welding. The slag system

is designed with characteristics so that these electrodes can be used to weld in

all positions and also to make welds at high speed. They are used to make

welds on sheet metal up to 4.8 mm thick and often are specifically designed for

galvanized, aluminized, or other coated steels. Since these welding electrodes

are sensitive to the effects of base metal quenching, they are not generally

recommended for the following:

a) T- or lap joints in materials thicker than 5 mm.

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