ísol-NFMCI

ísol-NFMCI is a solid continuous bare electrode that can be used for the same applications as the ícast-NFM covered SMAW electrode. The strength and ductility of this classification makes it suitable for welding the higher strength grades of nodular iron castings.

Post weld Heat Treatment: PWHT may also be used to improve the machineability of the heat-affected zone adjacent to the weld metal. Tempering beads sometimes are employed to achieve the desired improvement. These beads, consisting entirely of filler metal and a previous bead, are made in such a manner that the heat input tempers any martensite present from a previous bead.

CHEMICAL COMPOSITION OF UNDILUTED WELD METAL

C

Mn

Si

P

S

Fe

Ni*

Mo

Cu#

Mg

Al

Ce

Oth

0.50

10–14

1.0

NS

0.03

Rem

35–45

NS

2.5

NS

1.0

NS

1.0

Single values shown are maximum, unless otherwise noted. *Nickel plus incidental cobalt. #Copper plus incidental silver.

 

ALL-WELD-METAL MECHANICAL PROPERTIES

Tensile Strength, MPa	Yield Strength, At 0.2% Offset, MPa	Elongation %	Hardness, BHN
517–689	448–552	15–35	165–210

ELECTRODE SIZE & WELDING CURRENT (GMAW)

Size, mm	Current, DCEP, A	Arc Voltage (Volts)	Shielding Gas
1.20	180-250	28-32	75% Argon/25 Helium
1.60	200-280	29-33	75% Argon/25 Helium

SHIELDING-GAS: 75% Argon/25 Helium

• If sizes other than 1.2 mm and 1.6 mm are used, wire feed speed (and resulting current), arc voltage, and tip-to-work distance shall be changed as needed.
• If shielding gases other than recommended are used, the wire feed speed (and resulting current), arc voltage, and travel speed shall be as agreed to between purchaser and METAFIL.
• The required combination of electrode feed rate, arc voltage, and tip-to-work distance should produce welding currents in the ranges shown.
• Currents substantially outside these ranges suggest errors in feed rate, tip-to-work distance, voltage settings, or in instrumentation.

ELECTRODE SIZE & WELDING CURRENT (GTAW)

Size, mm	Current, DCEP, A	Arc Voltage (Volts)	Shielding Gas
0.80	60-90	12-15	100% Argon
1.20	80-110	13-16	100% Argon
1.60	90-130	14-18	100% Argon
2.40	120-175	15-20	100% Argon
3.20	150-220	15-20	100% Argon

SHIELDING-GAS: 100% Argon

• Arc voltage shall be reported for information only. The voltage range is only a suggested range and may change based on power source characteristics. Typically, the voltage cannot be set independent of the current.

WARNING: Safety and health information is available from many sources, including, but not limited to Safety and Health Fact Sheets listed in A11.3, ANSI Z49.1 Safety in Welding, Cutting, and Allied Processes published by the American Welding Society, 8669 Doral Blvd., Suite 130, Doral, FL 33166., and applicable federal and state regulations. The Safety and Health Fact Sheets are revised, and additional sheets added periodically.