For welding heat-resistant, high-alloy steels and for surfacing, the legend consists of:
- index E. electrode for manual arc welding and surfacing;
- the figure following the index indicating the average carbon content in hundredths of a percent;
- letters and numbers that determine the percentage of chemical elements. The order of the lettering of chemical elements is determined by a decrease in the average content of the corresponding elements in the weld metal. With an average content of the main chemical element of less than 1.5%, the number is not indicated behind the letter of the chemical element. With an average content in the deposited metal of silicon up to 0.8% and manganese up to 1.0%, the letters C and D are not affixed.
For welding carbon and low alloy steels with a tensile strength of up to 490 MPa (50 kgf / mm 2), 7 types of electrodes are used: E38, E42, E46, E50, E42A, E46A, E50A. For welding carbon and low alloy steels with a tensile strength from 490 MPa (50 kgf / mm 2) to 588 MPa (60 kgf / mm 2), two types of electrodes are used: E55, E60. For welding alloy steels of increased and high strength with a tensile strength at break of more than 588 MPa (60 kgf / mm 2), 5 types of electrodes are used: E70, E85, E100, E125, E150.
For welding heat-resistant steels. 9 types: E-09M, E-09MX, E-09X1M, E-05X2M, E-09X2M1, E-09X1MF, E-10X1MNBF, E-10X3M1BF, E10X5MF. For welding high alloy steels with special properties. 49 types: E-12X13, E-06X13H, E-10X17T, E-12X11NMF, E-12X11NVMF and others. For surfacing of surface layers with special properties. 44 types: E-10G2, E-10G3, E-12G4, E-15G5, E-16G2XM, E-30G2XM, etc.
Each type of electrode may correspond to one or more brands.
The diameter of the electrode (mm) corresponds to the diameter of the metal rod.
The purpose of the electrode
- For welding carbon and low alloy steels with tensile strength up to 588 MPa (60 kgf / mm 2). marked with a letter At;
- For welding alloyed structural steels with tensile strengths exceeding 588 MPa (60 kgf / mm 2). marked with a letter L;
- For welding heat-resistant steels. marked with a letter T;
- For welding high alloy steels with special properties. indicated by the letter IN;
- For surfacing of surface layers with special properties. marked with a letter N.
Coating Thickness Ratio
Depending on the ratio of the electrode coating diameter D to the diameter of the metal rod d, electrodes are divided into the following groups:
- with a thin coating (D / d≤1,2). marked with a letter M;
- with an average coating (1.2 1.8). G.
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Designation of a melting coated electrode
Letter E. international designation of a melting coated electrode.
A group of indices indicating the characteristics of the weld metal or weld metal
For electrodes used for welding carbon and low alloy steels with tensile strength up to 588 MPa (60 kgf / mm 2).
In the designation of the electrodes for welding alloy steels with tensile strengths exceeding 588 MPa (60 kgf / mm 2), the first two-digit number index corresponds to the average carbon content in the weld in hundredths of a percent; subsequent indices of letters and numbers show the percentage of elements in the weld metal; the last digital index, put through a hyphen, characterizes the minimum temperature at which the toughness of the weld metal is at least 34 J / cm 2 (3.5 kgf · m / cm 2). For instance, E-12X2G2-3 means 0.12% carbon, 2% chromium, 2% manganese in the weld metal and at 20 ° C has an impact strength of 34 J / cm 2 (3.5 kgf · m / cm 2).
The symbol for the electrodes for welding heat-resistant steels contains two indexes: the first indicates the minimum temperature at which the impact strength of the weld metal is at least 34 J / cm 2 (3.5 kgf · m / cm2); second index. the maximum temperature at which the long-term strength parameters of the weld metal are regulated.
The electrodes for welding high alloy steels are encoded by a group of indices consisting of three or four digits:
- the first index characterizes the resistance of weld metal to intergranular corrosion;
- the second indicates the maximum operating temperature at which the parameters of long-term strength of the weld metal are regulated (heat resistance);
- the third index indicates the maximum working temperature of welded joints, to which the use of electrodes is allowed when welding heat-resistant steels;
- the fourth index indicates the content of the ferritic phase in the weld metal.
The designation of electrodes for surfacing of surface layers consists of two parts. The first index indicates the average hardness of the deposited metal and is expressed by the fraction: in the numerator. Vickers hardness, in the denominator. according to Rockwell.
The second index indicates that the hardness of the deposited metal is ensured: without heat treatment after surfacing. 1, after heat treatment. 2.
For instance: E-300 / 32-1. hardness of the deposited layer without heat treatment.
Type of coating designation
- A. acid coating;
- B. main coating;
- Ts. cellulose coating;
- R. rutile coating;
- AR, RB, RC etc. mixed coatings. respectively: sour-rutile, rutile-basic, rutile-cellulose;
- P. others.
If there is more than 20% iron powder in the coating, the letter is added F, eg, Already.
About coating electrodes there is an article Coating welding electrodes.
Designation of permissible spatial positions
- 1. for all positions.
- 2. for all positions except vertical "top down".
- 3. for the bottom horizontal on the vertical plane and vertical "upwards".
- 4. for bottom and bottom for corner joints.
often the international designation of the positions of the seams for which the electrodes are intended is used.
Designation of characteristics of welding current and open circuit voltage of a power source
Number denote electrodes intended for welding or surfacing only with direct current of reverse polarity.