IDENTIFICATION
Gemet 812, E CuNi
CLASSIFICATION
AWS/SFA 5.6 ECuNi
DIN: 1733 EL CuNi30Mn (2.0838)
DESCRIPTION
A basic coated 70/30 core wire electrode depositing weld metal with very low residuals (S, P, Pb, Zn, Sn, etc.) and hence maximum crack resistance. The deposited weld metal is resistant to the action of sea water, free of porosity and crack–resistant.
WELD METAL ANALYSIS (RANGE) %
| Mn | Fe | Si | Ni | C | P | Pb | Ti | Cu |
| 1.0 - 2.50 | 0.40 - 0.75 | 0.5 | 29.0 - 33.0 | 0.05 | 0.02 | 0.02 | 0.5 | reminder |
| max | max | max | max | max |
MECHANICAL PROPERTIES (RANGE)
| UTS (N/mm²) | EL (%) (L=4D) |
| 350 - 480 | 20 - 30 |
TYPICAL APPLICATIONS
• For welding 70/30 alloys C71500 (Wrought) C96400 (Cast)
• 90/10 alloys C70600 (Wrought)
• C96200 (Cast)
• Alloy A
• Off-shore construction
• Desalination plant
• Evaporators, Condensers
• In salt and sea water processing systems.
PREHEATING:
• Not normally required • Max. interpass temp 100ºC • No PWHT be given
PRECAUTIONS:
Contamination of the weld zone with foreign material particularly any source of lead, zinc, tin must be avoided to prevent weld metal cracking.
ASME IX QUALIFICATION: QW-432 F NO. 34
WELDING INSTRUCTIONS
• Clean thoroughly the welding area / zone.
• Vee angle of the butt joint should be 70ºC.
PACKING PARAMETERS
| Size (mm) | Length (mm) | Current Condition Amps AC / DC (+/-) | Packing / Packet (kg) | Packing / Box (kg) |
| 2.5 | 350 | 60 - 90 | 2 | 2 x 5 = 10 |
| 3.15 / 3.20 | 350 | 75 - 120 | 2 | 2 x 5 = 10 |
| 4 | 350 | 110 - 155 | 2 | 2 x 5 = 10 |
| 5 | 350 | 130 - 210 | 2 | 2 x 5 = 10 |