T – 620
Permissible spatial positions during welding
T – 620 Welding Electrodes
Welding electrodes for gray, high-strength and malleable cast iron
Prices for welding electrodes
Type of coverage
Special (alloying). Ferrochrome, ferrotitane, ferrobor, boron carbide and graphite are introduced into the coating to obtain a high hardness of the deposited metal.
Current and polarity
Direct current of direct polarity (DC-) and alternating current. Surfacing is performed only in the lower and inclined positions.
Surfacing coefficient
9.0 g/ah
Consumption of electrodes
~ 1.4 kg per 1 kg of deposited metal
Application Area. T – 620 Welding Electrodes.
T-620 are surfacing electrodes for hardening and restoration of rapidly wearing parts operating under conditions of predominantly abrasive wear with moderate impact loads:
• Mining industry: surfacing of crusher jaws, roll crusher tyres, hammer crusher hammers, coal grinding mills, rotary excavator bucket teeth
• Power engineering: surfacing of smoke exhauster blades, impact plates, coal pulverizer parts
• Construction equipment
• General mechanical engineering
Welding Technique. T – 620 Welding Electrodes.
Surfacing is performed only in the flat position with narrow beads. It is recommended to apply no more than two layers on steel and one layer on cast iron to avoid spalling. The process is carried out with direct current of straight polarity (DC-) or alternating current.
Regulatory Documents. T – 620 Welding Electrodes.
GOST 9466-75, GOST 9467-75.
Main Weldable Materials. T – 620 Welding Electrodes.
Surfacing of parts operating under conditions of intense abrasive wear with moderate impact loads (bucket teeth, blades, crusher parts).
Chemical Composition of Deposited Metal, %
| C | Si | Mn | P | S | Cr | B | |
| Minimum | 2.90 | 2.00 | 0.50 | <0.040 | <0.035 | 22.00 | 0.50 |
| Maximum | Base | 0.20 | 1.80 | <0.040 | <0.035 | 24.0 | 1.50 |
Welding Recommendations (Current, A)
| Diameter, mm | Weld Position | ||
| Flat | Vertical | Overhead | |
| 3.0 | 100-170 | – | – |
| 4.0 | 150-220 | – | – |
| 5.0 | 200-270 | – | – |
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
Email address:
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