Identification of welding rod model and brand

Function and type of electrode coating

1. Basic functions of electrode coating:
(1) Protective arc and molten pool
The coating melts more slowly than the welding core to form a sleeve to protect the metal droplets from transferring smoothly to the molten pool; At the same time, the coating emits gas and forms slag to protect the arc and molten pool from the harmful effect of air. The slag covers the surface of the deposited metal, which also reduces the cooling rate of the weld metal and is conducive to improving the performance of the joint.
(2) Metallurgical treatment
The impurities are removed through metallurgical reaction until deoxidation, desulfurization and dephosphorization, and the weld metal is alloyed at the same time.
(3) Endow the electrode with good welding process performance
Make the arc easy to ignite, stable combustion, reduce splash, increase penetration, ensure weld formation, etc.
(4) Meet the special functions of some special electrodes

For example, the coating of iron powder electrode contains more iron powder, which increases the deposition coefficient of the electrode and improves the welding productivity.

20210816091127 58005 - Identification of welding rod model and brand

2. Type of electrode coating:

Serial number

Skin type

Corresponding brand

Corresponding model

Welding power supply

1

Special type

××× 0

E ×× 00

2

Titanium type

××× 1

E ×× 13

DC or AC

3

Titanium calcium type

××× 2

E ×× 03

DC or AC

4

Ilmenite type

××× 3

E ×× 01

DC or AC

5

Iron oxide type

××× 4

E ×× 20

DC or AC

6

Cellulose type

××× 5

E ×× 10, 11

DC or AC

7

Low potassium hydrogen type

××× 6

E ×× 16

DC or AC

8

Low sodium hydrogen type

××× 7

E ×× 15

Direct

9

Stone ink type

××× 8

E ×× 13

DC or AC

10

Salt base type

××× 9

E ×× 13

Direct

3. Acid and alkaline electrodes:
(1) The coating melts to form slag during welding
The electrode with acidic slag after welding is called acidic electrode, and vice versa is alkaline electrode.
(2) Disadvantages of acid electrode
The slag composition of acid electrode is mainly acid oxide, which has strong oxidation to the weld metal, resulting in large burning loss of alloy elements in the weld metal. At the same time, the content of hydrogen and oxygen in the weld metal is high, and the mechanical properties, especially plasticity and toughness, of the weld metal are low.
(3) Advantages of acid electrode
It is less sensitive to pores caused by rust, oil and water. Acid electrode can be welded with AC or DC power supply.
(4) Advantages of alkaline electrode
The slag composition of alkaline electrode is mainly alkaline oxide, which has little oxidation to weld metal and good metallurgical treatment effect. When welding with alkaline electrode, the coating decomposes CO2 as the shielding gas, and the hydrogen content in the shielding gas is very low. Therefore, the weld metal welded with alkaline electrode has low hydrogen content and good comprehensive mechanical properties, especially high plasticity and toughness.
(5) Disadvantages of alkaline electrode
It is sensitive to stomata.

Significance of uniform numbering of welding rods

1. The model and brand of welding rod are usually used to reflect its main performance characteristics and categories.
2. The model of welding rod is an expression method based on the national standard of welding rod and reflecting the main characteristics of welding rod.
3. Welding rod brand is the specific naming of welding rod products according to the main purpose and performance characteristics of welding rod. Prepared by the welding rod manufacturer.
China’s electrode industry adopts a unified brand: products belonging to the same coating type, conforming to the same electrode model and similar performance are uniformly named as one brand. Such as J422 and J507.
Be careful:
(1) Whether it is the brand set by the welding rod factory or the unified brand in the national welding material industry, it must indicate on the product sample, label and quality certificate whether the product is “in line with the national standard”, “equivalent national standard” or not (i.e. inconsistent with the national standard), so that users can select it according to the product performance requirements and standards.
(2) Each electrode product has only one brand, but multiple brands of electrodes can correspond to one model at the same time. For example, the brands J507RH and J507r are E5015-G.

Classification and comparison of welding rods

By brand By model
Structural steel electrode Carbon steel
Low alloy steel electrode
Low temperature steel electrode
Molybdenum and chromium molybdenum heat resistant steel electrode
Stainless steel electrode
Chromium stainless steel electrode
Cr Ni austenitic stainless steel

Representation of welding rod grade

1. It is usually represented by a Chinese pinyin letter (or Chinese character) and three digits. Such as A302 (AO 302), W607 (WEN 607).
2. For some welding rod grades, suffix letters and/or numbers shall be added after three digits. Such as J507RH, A022MO, J422FE16.

  • The first letter: indicates the type of welding rod;
  • The first two digits: indicate the strength of deposited metal or alloy type;
  • The third digit: indicates the type of coating and current type;
  • Letters and numbers after numbers: additional alloy elements or electrode characteristics (with special properties and uses).

Such as:

  • G – high toughness electrode; R – welding rod for pressure vessel;
  • Fe — high efficiency iron powder electrode: X — electrode for downward vertical welding;
  • H — ultra low hydrogen electrode; RH — high toughness ultra-low hydrogen electrode;

Representation of electrode model

1. Carbon steel electrode:
(1) According to GB/T5117 carbon steel electrodes, the models of carbon steel electrodes are divided according to the mechanical properties of deposited metal, coating type, welding position and welding current type.
(2) Preparation method of carbon steel electrode model:

  • The first letter “e” indicates welding rod;
  • The first two digits represent the minimum tensile strength of deposited metal, in kgf/mm2;
  • The third digit indicates the welding position of the electrode: “0” and “1” indicate that the electrode is suitable for all position welding“ 2 “indicates that the welding rod is suitable for flat welding and flat fillet welding“ 4 “indicates that the electrode is suitable for downward vertical welding.

When the third and fourth digits are combined, it indicates the type of welding current and coating type.
Letters or numbers shall be added after the fourth digit: “R” refers to the moisture absorbing electrode, “m” refers to the electrode with special provisions on moisture absorption and mechanical properties, “1” refers to the electrode with special provisions on impact properties.
Give an example:

  • E4303: 43kgf/mm2; Full position; Titanium calcium type; Both AC and DC.
  • E5015: 50kgf/mm2; Full position; Low sodium hydrogen type; DC reverse connection.
  • E5018-1: 50kgf/mm2; Full position; Iron powder low hydrogen type; AC or DC reverse connection- 46 ℃ low temperature impact guarantee value.

2. Low alloy steel electrode:
(1) According to GB/T5118 low alloy steel electrodes, the models of low alloy steel electrodes are divided according to the mechanical properties, chemical composition, coating type, welding position and welding current type of deposited metal.
(2) Preparation method of low alloy steel electrode model:
The first letter “e” indicates welding rod;
The first two digits represent the minimum tensile strength of deposited metal (kgf/mm2);
The third digit indicates the welding position of the electrode: “0” and “1” indicate that the electrode is suitable for all position welding“ 2 “indicates that the welding rod is suitable for flat welding and flat fillet welding.
When the third and fourth digits are combined, it indicates the type of welding current and coating type;
The suffix letter is the chemical composition classification code of the deposited metal, and is separated from the front with a dash “-“. If there are additional chemical components, the additional chemical components are directly represented by element symbols and separated from the suffix letters with a dash “-“.
E.g.: E5515-B2-V (R317)
For E50xx-x, E55xx-x and e60xx-x low hydrogen electrodes, when the suffix letter or the letter “R” is added after the additional chemical composition, it indicates the moisture absorbing electrode.
Give an example:

  • (1) E5015-G (J507RH, J507r, etc.): 50kgf/mm2 (490MPa); Low sodium hydrogen type; High toughness (low temperature impact guarantee value); DC reverse connection; All position welding.
  • (2)E6015-G(J607RH): 60kgf/mm2(610MPa); Low sodium hydrogen type; Ultra low hydrogen and high toughness; (- 40 ℃ low temperature impact guarantee value); DC reverse connection; All position welding.
  • (3) E5515-C1 (W707ni): low sodium hydrogen type; Containing 2.5ni; 55kgf/mm2(540MPa); High toughness (- 70 ℃ impact guarantee value); DC reverse connection; All position welding.
  • (4) E5515-C2 (w907ni): low sodium hydrogen type; Containing 3.5Ni; 55kgf/mm2(540MPa); High toughness (- 90 ℃ impact guarantee value); DC reverse connection; All position welding.
  • (5) E5515-b1 (r207): low sodium hydrogen type; 0.5Cr-0.5Mo; 540Mpa, normal temperature impact guarantee value; DC reverse connection; All position welding.
  • (6) E5515-B2 (R307): low sodium hydrogen type; 1Cr-0.5Mo; 540Mpa, normal temperature impact guarantee value; DC reverse connection; All position welding.
  • (7) E5515-B2-V (R317): low sodium hydrogen type; 1Cr-0.5Mo-V; 540Mpa, normal temperature impact guarantee value; DC reverse connection; All position welding.
  • (8) E6015-b3 (R407): low sodium hydrogen type; 2.5Cr-1Mo; 590MPa, normal temperature impact guarantee value; DC reverse connection; All position welding.

3. Stainless steel electrode:
(1) According to GB/T983 stainless steel electrodes, the models of stainless steel electrodes are divided according to the chemical composition of deposited metal, coating type, welding position and welding current type.
(2) Preparation method of stainless steel electrode model:
The first letter “e” indicates welding rod;
The number after “e” indicates the classification code of chemical composition of deposited metal. If there are special requirements for chemical composition, the chemical composition is represented by element symbol and placed after the number;
The two numbers after the short line “-” indicate the coating type, welding position and welding current type“ 15 “indicates alkaline, titanium or titanium calcium coating, all position welding, AC or DC reverse connection“ 16 “indicates alkaline coating, all position welding and DC reverse connection“ “17” is a variant of “16”.
(3) The model of stainless steel electrode is the same as that of the United States, Japan and other industrial developed countries.
give an example:

  • (1) E308l-16 (A002): titanium calcium type; Ultra low carbon (C ≤ 0.04%); Nominal composition: 00-19cr-10ni; AC or DC reverse connection (DC power supply shall be used as far as possible); All position welding.
  • (2) E308-15 (A107): alkaline; Low carbon (C ≤ 0.08%); Nominal composition: 0-19cr-10ni; DC reverse connection; All position welding.
  • (3) E316l-16 (A022): titanium calcium type; Ultra low carbon (C ≤ 0.04%); Nominal composition: 00-18cr-12ni-2MO; AC or DC reverse connection (DC power supply shall be used as far as possible); All position welding.
  • (4) E316-15 (A207): alkaline; Low carbon (C ≤ 0.08%); Nominal composition of deposited metal: 0-18cr-12ni-2MO; DC reverse connection; All position welding.
  • (5) E347-15 (A137): alkaline; Low carbon (C ≤ 0.08%); Containing Nb stabilizer; Nominal composition: 0-19cr-10ni Nb; DC reverse connection; All position welding.
  • (6) E309-15 (A307): alkaline; C ≤ 0.15%; Nominal composition: 1-23cr-13ni; DC reverse connection; All position welding.
  • (7) E310-16 (A402): titanium calcium type; C = 0.08-0.20%; Pure austenite structure, nominal composition: 2-26cr-21ni; AC or DC reverse connection (DC power supply shall be used as far as possible); All position welding.

Note: l indicates low carbon content (C ≤ 0.04%); H indicates high carbon content (c > 0.15%).
Exceptional case:

  • E5mov-15 (r507): low sodium hydrogen type; 5Cr-0.5Mo-V; 520MPa
  • E9mo-15 (r707): low sodium hydrogen type; 9Cr-1Mo,590MPa

By brand: it belongs to Pearlite Heat-resistant Steel (low alloy steel) electrode. By model: it belongs to stainless steel electrode. GB/T983-1995 proposes that it will be included in the next revised GB/T5118 standard.

Comparison of brands and models at home and abroad (for example)

Type of electrode Domestic brand National standard model AWS model
Carbon steel electrode J422 E4303
J506 E5016 E7016
Low alloy structural steel electrode J506R E5016-G E7016-G
J506RH E5016-G E7016-G
J607 E6015-D1 E9015-D1
Low temperature steel electrode W707Ni E5515-C1 E8015-C1
Pearlite heat resistant steel electrode R407 E6015-B3 E9015-B3
Chromium stainless steel electrode G207 E410-15 E410-15
Chromium nickel austenite A042 E319Mo E309MoL-16
Stainless steel electrode A022Mo E317L-16 E317L-16
Nickel base alloy electrode Ni307B ENiCrFe-3

Source: Network Arrangement – China Wire Rod Manufacturer – Yaang Pipe Industry Co., Limited (www.steeljrv.com)

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

If you want to have more information about the article or you want to share your opinion with us, contact us at sales@steeljrv.com

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