MR – 3S
Permissible spatial positions during welding
MR – 3S Welding Electrodes
Electrodes for welding of carbon and low alloy steels
Prices for welding electrodes
Type of coverage
Rutile-cellulose (rutile-cellulose). It provides easy arc ignition, stable combustion, uniform melting of the coating without splashing, easy separation of the slag crust and good seam formation in all spatial positions.Gorenje
Current and polarity
Direct current and alternating current (AC/DC) of any polarity. Reverse polarity (+) is recommended for direct current
Surfacing coefficient
8.5 g/ah
Consumption of electrodes
~ 1.7 kg per 1 kg of deposited metal
Application Area. MR – 3S Welding Electrodes.
MR – 3S is the “golden mean” and one of the most popular types of electrodes for:
• General industrial and civil construction: installation of metal structures, frames, trusses.
• Shipbuilding and bridge construction: where welding in various positions is important.
• Pipeline installation (non-critical).
• Repair and assembly work in industry and agriculture.
Welding Technique. MR – 3S Welding Electrodes.
It is recommended to perform welding with a medium (short) arc length, tilting the electrode at a backhand angle (away from the welding direction) to ensure deep penetration.
Regulatory Documents. MR – 3S Welding Electrodes.
GOST 9466-75, GOST 9467-75.
Corresponding International Standard.
E 412 (4) – B20
Special Properties. MR – 3S Welding Electrodes.
The electrodes are not prone to crack and pore formation in the deposited metal. They have excellent welding and technological properties, allow welding over rust, wet, and contaminated surfaces. They ensure stable arc burning when welding with a long arc and easy re-striking.
Chemical Composition of Deposited Metal, %
| C | Si | Mn | P | S | |
| Typical Value | 0.08-0.12 | 0.07-0.25 | 0.35-0.80 | ≤0.035-0.045 | ≤0.035-0.040 |
Welding Recommendations (Current, A)
| Diameter, mm | Weld Position | ||
| Flat | Vertical | Overhead | |
| 2.0 (350) | 40-60 | 40-60 | 40-60 |
| 2.5 (350) | 70-90 | 60-100 | 60-100 |
| 3.0 (350) | 90-130 | 80-110 | 80-110 |
| 4.0 (450) | 140-180 | 120-160 | 120-160 |
| 5.0 (450) | 180-260 | 160-200 | not recommended |
We respond quickly to questions on Telegram
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Bottom horizontal or in a boat
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Bottom to the corner
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Horizontal seam on a vertical plane
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Vertical seam for lifting
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Vertical seam for descent
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Ceiling seam
All covered electrodes are sensitive to moisture absorption. Excessive moisture content in the coating can lead to porosity or hydrogen cracking.
However, if the climatic storage conditions meet the following requirements, moisture absorption by the electrodes is minimal:
• 5–15°C at a maximum relative humidity of 60%
• 15–25°C at a maximum relative humidity of 50%
• >25°C at a maximum relative humidity of 40%
At lower temperatures, maintaining the storage temperature 10°C above the ambient temperature is sufficient to achieve the required moisture content level. Cold packages must be allowed to warm up to ambient temperature before opening.
At higher temperatures, the required moisture content in the air can be achieved by dehumidification. The shelf life of electrodes under the above conditions shall not exceed three years.
• Covered electrodes with a basic coating and low hydrogen content must be baked prior to each use whenever requirements regarding the content of diffusible hydrogen and/or the soundness of the deposited metal are specified.
• Stainless steel electrodes with a basic coating may produce porosity during welding if the humidity levels during their storage did not meet the requirements. To restore their original properties, they also need to be baked.
• Electrodes for welding carbon steels with a cellulosic or rutile coating typically do not require baking.
• Electrodes that have suffered serious damage due to exposure to moisture cannot be restored by rebaking and must be rejected.
Contacts
Company phone numbers:
+375 (29) 688-27-06
+375 (17) 388-28-02 accountant
+375 (17) 388-28-03 sales department
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