OZN – 300
Permissible spatial positions during welding
Type of coverage
Basic.
Current and polarity
Direct current of reverse polarity (DC+, “plus” on the electrode) and alternating current from power sources with no-load voltage (50±5)V. Surfacing is performed mainly in the lower position.
Surfacing coefficient
10.5 g/ah
Consumption of electrodes
~ 1.7 – 1.8 kg per 1 kg of deposited metal
Application Area. OZN – 300 Welding Electrodes.
Designed for surfacing of parts made of carbon and low-alloy steels subject to wear and crushing (railway crossings, shafts, axles, locomotive and wagon parts, etc.). Surfacing in the flat position with direct current of reverse polarity.
Welding Technique. OZN – 300 Welding Electrodes.
Surfacing should be performed with a short arc on a cleaned surface, as the deposited metal is prone to porosity formation. If the permissible moisture content in the coating (0.7%) is exceeded, the electrodes must be additionally baked before use at a temperature of 280-300°C for 40-60 minutes.
Regulatory Documents. OZN – 300 Welding Electrodes.
GOST 9466-75, GOST 9467-75.
Main Weldable Materials. OZN – 300 Welding Electrodes.
Surfacing of steel parts subject to mechanical wear and impact loads: railway crossings, switch points, axles, wagon and locomotive parts, shafts, excavator journals, construction equipment parts.
Special Properties. OZN – 300 Welding Electrodes.
The electrodes ensure the production of deposited metal with increased stability of hardness and wear resistance indicators over a wide range of cooling rates of the surfaced parts. Machining of the deposited metal is possible without softening heat treatment.
Chemical Composition of Deposited Metal, %
| C | Si | Mn | P | S | |
| Minimum | 0.13 | Traces | 3.00 | <0.030 | <0.020 |
| Maximum | 0.17 | Traces | 3.50 | <0.030 | <0.020 |
Welding Recommendations (Current, A)
| Diameter, mm | Weld Position | ||
| Flat | Vertical | Overhead | |
| 3.0 | 120-140 | – | – |
| 4.0 | 140-160 | – | – |
| 5.0 | 160-180 | – | – |
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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