The electrodes TMU - 21U
WELDING ELECTRODES TMU-21U (diameter 3; 4; 5 mm)
CLASSIFICATION: E50A in accordance with GOST 9466
LEGEND: E50A - TMU-21U - Ø - UD
E - 51 3 - B30
TECHNICAL REQUIREMENTS: GOST 9466-75, GOST 9467-75i TU RB 100034500.018-2007
COATING: main
PURPOSE:
Intended for welding of steel structures, pipelines, pipes and other tubular members made of carbon and low-alloy structural steels in all positions seam, except vertical "top-down", direct current reverse polarity.
CHARACTERISTICS Electrodes:
arcing |
sustainable; |
splashing degree |
small |
formation of the joint |
good; |
Separation of the slag crust |
good |
The tendency of the weld metal to pore formation |
low; |
deposition rate (in the lower position of the weld) |
9.0-9.5 g / Ah; |
deposition rate (electrode diameter 4.0 mm) |
1,2-1,6 kg / h; |
Electrode consumption per 1 kg of weld metal |
1.5 kg; |
Typical mechanical properties of weld metal (at 20 ° C):
Tensile strength, MPa |
Yield strength, MPa |
Relative extension, % |
Impact toughness J / cm2 |
520 |
420 |
22 |
130 |
Chemical composition of deposited metal:
Element content,% |
||||
Carbon |
Manganese |
Silicon |
Sulfur |
Phosphorus |
0.06-0.12 |
0.6-1.0 |
0,20-0,43 |
No more than 0,030 |
No more than 0,035 |
DIRECTIONS FOR USE:
In case of exceeding the permissible moisture content in the coating (0.3%) prior to use electrodes must be further calcined at a temperature of 380-400 ° C. calcining time of from 40 to 60 minutes.
welding conditions (current) must be as specified in Table
WELDING MODES:
Electrode diameter mm |
Welding current, A |
||
joint position |
|||
Underwear |
vertical |
ceiling |
|
3 |
100-130 |
60-120 |
90-120 |
4 |
130-180 |
120-160 |
120-160 |
5 |
170-210 |
160-210 |
- |
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