NIAT – 5
Permissible spatial positions during welding
NIAT – 5 Welding Electrodes
Electrodes for welding high-alloy steels
Prices for welding electrodes
Type of coverage
Basic. It provides stable arc burning and high mechanical properties of the deposited metal.
Current and polarity
Direct current of reverse polarity (DC +, “plus” on the electrode).
Surfacing coefficient
12.0 – 12.5 g/ah
Consumption of electrodes
~ 1.55 – 1.7 kg per 1 kg of deposited metal
Application Area. NIAT – 5 Welding Electrodes.
NIAT-5 welding electrodes are intended for welding of critical structures made of alloyed steels of increased and high strength in the thermally hardened condition without subsequent post-weld heat treatment, including steels grades 30KhGSA and 30KhGSNA, as well as welding of low-alloy and alloyed steels with austenitic steels.
Welding in flat, vertical, and limited overhead weld positions with direct current of reverse polarity.
Welding Technique. NIAT – 5 Welding Electrodes.
Welding with NIAT-5 electrodes is performed with a short and extremely short arc length on a surface cleaned of contaminants. The process is carried out with direct current of reverse polarity (DC+) in all spatial positions, except vertical “top-to-bottom”.
Regulatory Documents. NIAT – 5 Welding Electrodes.
GOST 9466-75, GOST 9467-75.
Corresponding International Standard.
E – 000 – B20 (nickel type)
Main Weldable Materials. NIAT – 5 Welding Electrodes.
Welding of high-strength alloyed steels in the thermally hardened condition (30KhGSA, 30KhGSNA and similar) without subsequent heat treatment. Welding of dissimilar joints (low-alloy steel + austenitic steel).
Chemical Composition of Deposited Metal, %
| C | Si | Mn | P | S | Ni | Mo | Cr | N | |
| Typical Value | 0.10 | 0.23 | 1.60 | <0.022 | <0.011 | 25.4 | 5.80 | 15.40 | < 0.12 |
Welding Recommendations (Current, A)
| Diameter, mm | Weld Position | ||
| Flat | Vertical | Overhead | |
| 2.0 (280) | 30-60 | 30-50 | not recommended |
| 2.5 (280) | 40-70 | 30-50 | 30-70 |
| 3.0 (320) | 50-100 | 40-80 | 40-100 |
| 4.0 (360) | 90-160 | 80-120 | 80-160 |
| 5.0 (360) | 130-180 | not recommended | not recommended |
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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.
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