G-TECH 306Cu

SMAW
  • CAST IRON
NiFe-Cu

Description

Special coated electrode
Special electrodes with Fe-Ni-Cu core for joining cast iron to steel and repairs on difficult to weld cast-iron. They are used to produce a low depth of fusion weld, since high dilution by the base metal may cause weld cracking. Ease of slag removal reduces post-welding cleaning operations to a minimum.
Specifications
EN ISO 1071
(E NiFe-1)
AWS A5.15
(ENiFe-Cl)
Shielding
-
Positions
PA, PB, PC, PD, PF
Current
DC+
Packaging Type
Carton box

Hardness

160HB
Chem. Comp. %
DEFAULT
C
0.8
Mn
0.6
Ni
52.5
S
0.02
Cu
5.8
Mechanical Properties
min
variant
Tensile strength Rm MPa
400
410
Yield strength Rp0.2 MPa
300
320
Elongation A (L0=5d0) %
10
15
Impact Charpy ISO-V
-
-
Impact Charpy ISO-V
-
-
Welding Parameters
2.5 mm
3.2 mm
4 mm
Ampere
70A - 90A
90A - 120A
120A - 140A
Voltage
-
-
-
Packaging
pcs/kg
pcs/kg
pcs/kg
Packaging Type
Carton box
Carton box
Carton box
NiFe-Cu
Description

Application

The weld metal color exceptionally matches with cast iron, making it ideal for correcting casting defects on new components. It has a hardness of approximately 165 HBOK. The deposit can be made on both cold or slightly preheated materials. The weld metal offers excellent machinability characteristics. For castings with phosphorus contents higher than normal, around 0.20%, these materials are more effective compared to the ENi-CI classification. Practical experiences show that successful welds can be achieved on thick and highly constrained components, as well as on high-strength cast irons.

Alloy Type

Electrodi con rivestimento speciale basico-grafitico e anima in lega di nichel e rame.

Microstructure

La struttura dipende dalla composizione chimica e dalla velocità di solidificazione e successivo raffreddamento.

Materials

Utilizzato per le normali qualità di ghisa come le ghise grigie, duttili e malleabili e per unire pezzi di lavoro di vari tipi di ghisa, compresa la ghisa nodulare, e per saldarli all'acciaio e ad alcuni metalli base non ferrosi.

Welding & PWHT

Remove the fusion crust from the welding area by machining, grinding, chipping, or suitable methods. When repairing fusion defects, carefully remove defective metals from the base piece. Remove grease, oil, dirt, or foreign matter with suitable solvents. If the casting is oil or solvent-impregnated, apply heat until they evaporate; generally, 400 °C is sufficient. In cases of high grease presence, quickly heat the area to about 540 °C for elimination. The use of preheating is not always necessary but often preferable. Preheat to 200-350 °C, cool gradually post-welding, and maintain an interpass temperature between 350-450 °C to prevent cracking. In large castings, opting for intermittent welds can promote uniform temperature distribution, keeping the casting hot but not excessively so.

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