SHIELD METAL ARC WELDING (SMAW)

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NC-50

Specification
AWS Specification: AWS A5.15 ENiFe-Cl
JIS Specification: DFC NiFe
Other Specification: DIN 8573: ENiFe-G2
Description
  • NC-50 is an iron-nickel alloy welding  electrode for high strength joints on cast iron
  • Also for the fabrication and repair of a wide range of cast iron components and for the joining of cast iron to steel
  • Used primarily for welding nodular graphite or spheroidal graphite (SG) cast irons
  • Weld deposit provides good levels of strength
  • Crack resistant
  • Weld metal is fully machinable
  • Specially designed to avoid electrode overheating
  • Easy to control due to soft smooth arc characteristics that produce even weld beads of good contour 
TYPICAL CHEMICAL COMPOSITION OF ALL WELD METAL DEPOSITS (%):

C

Si

Mn

Ni

Fe

1.18

0.70

0.49

56.80

Bal.

 

TYPICAL MECHANICAL PROPERTIES OF ALL WELD METAL DEPOSITS:
Tensile Strength
N/mm2 (KSI)
 
Elongation
%
 
Hardness HV (HRB)
 

480 (70)

18

170 - 190 (85 - 90)

 

SIZE AND RECOMMENDED CURRENT RANGE: AC, DC (+)

DIAMETER (mm)

2.5

3.2

4.0

5.0

LENGTH (mm)

300

350

350

350

Current Amp

50 - 80

70 - 110

100 - 140

130 - 170

Welding Positions: ALL POSITIONS EXCEPT VERTICAL DOWN
Approvals: N/A

NOTE:

The information contained or otherwise referenced herein is presented only as “typical” without guarantee or warranty, and Industrial Welding Corporation expressly disclaims any liability incurred from any reliance thereon. Typical data and test results for mechanical properties, deposit, or electrode composition and other properties were obtained from a weld produced and tested according to prescribed standards and should not be assumed to be the expected results in a particular application or weldment. Actual results will vary depending on many factors, including, but not limited to, weld procedure, plate chemistry and temperature, weldment design, and fabrication methods. Users are cautioned to confirm by qualification testing, or other appropriate means, the suitability of any welding consumable and procedure before use in the intended application.

  • For repair and fabrication of cast iron housings, blocks, machinery, parts, frames, casting defects, casting flaws, machine cuts, machining errors, repair of cracks, rebuilding worn or damaged areas and joining thick section castings and cast irons to steel
  • Remove all traces of paint, grease, oil, rust, and oxides prior to welding
  • Pay particular attention to castings with sand inclusions
  • Use NFG cutting electrodes for the removal of defects and the preparation of cracked sections
  • Generally, small section castings can be welded without preheat. However, it is important that the base metal interpass temperature does not rise above the "hand-hot" level
  • Deposit in short intermittent beads about 25-50mm with frequent interruptions to allow cooling to take place
  • Fill crater at the end of each weld bead
  • Remove all traces of slag remnants before applying the next bead
  • Deposit without weaving and hammer each weld bead (while still hot) to reduce both local stresses and the risk of weld metal cracking
  • Large castings should be heated slowly and uniformly to a temperature in the range of 100 - 300ºC. After welding, the workpiece should be cooled slowly at an even rate.

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