Submerged arc welding EM-12

Item code : EM-12 Description : EM-12 is a kind of welding wire with low Carbon and Silica average Manganese, negligible impurities of S and P that makes weld’s joint with metal appearance good.

TCVN 6259–6:2003
AW53 - F7A2 / F7A0  EM12
1. Characteristics on usage
·      EM-12 is a kind of welding wire with low Carbon and Silica average Manganese, negligible impurities of S and P that makes weld’s joint with metal appearance good. It is possible to combine with various welding flux to have weld’s joint with mechanical properties as requirement.
·     EM-12 has high fidelity and steady wire direction and is covered with a pure copper plated layer. It makes preservation and welding process stable.
·      EM -12 is welded with automatic technology, submerged arc under protective flux layer that makes weld’s joint stable. Basing on kind of welding flux (CM143 (F7A2) and CM185 (F7A0)), typical mechanical properties are presented in the following table.
·      EM-12 is appropriate for welding low Carbon steel frame and average alloy such as pressure basin, pipe, weight-resistant steel frame and civil frame, bridges and roads, automobiles, ships.
      2. Typical chemical composition of (deposited) all-weld-metal (%):
C
Mn
Si
S
P
0.06 ~ 0.12
0.80 ~ 1.25
0.10 max
0.025 max
0.025 max.
     3. Specification – packing – welding current range
Size (mm)
Æ2.0
Æ2.4
Æ3.2
Æ4.0
Æ5.0
Welding current range ( A)
300~350
350~400
420~460
480~520
550~610
Welding voltage range ( V )
26~28
27~29
28~30
28~30
28~30
     4. Typical mechanical properties according to protective flux conditions.
Welding flux
Tensile strength
N/mm2
Yield strength
N/mm2
Elongation
%
Impact value
( J )
EM12 - CM143
(F7A2)
400 ( min )
510 (min)
22 ( min )
50(min)/ -29OC
EM12 - CM185
(F7A0)
400 ( min )
510 (min)
22 ( min )
50(min)/ -20O
     
      5. Usage instruction:
  • Well preparation for safety before welding. Stable power.
  • Remove dirt such as oil, rust on welding objects. Clean welding area to avoid impurities and strange bodies in welding flux. Weld in accordance with the process.
  • Clean wire pipeline, adjust welding wire to ensure for stability. Do not let wire be untidy and deformed
  • When welding wire and flux mix is dirty and wet. It must be smoky, splashy, unstable. Keep in dry area, tight packing to avoid dirt, moisture. Dry welding flux at temperature of over 200OC for 40 ~ 60 minutes before welding.
  • Choose the right current and speed, maintain amount of flux, follow instruction to get the highest effect.
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