Stainless Steel

JACKSUN NOVA 312

AWS/ASME: A5.9 ER312

JACKSUN NOVA 312 is a stainless steel solid wire designed for MIG (GMAW) and TIG (GTAW) welding applications. It is highly alloyed and ideal for:
Joining dissimilar steels such as stainless to carbon steel or low alloy steels.
Welding steels difficult to weld (e.g., high-carbon steels, tool steels, Mn steels).
Applications requiring crack resistance in high restraint joints.
Buffer layers before hardfacing or stainless overlays.
The weld metal has a two-phase microstructure (austenite + ferrite), providing exceptional strength and crack resistance.

1. Typical Chemical Composition of Weld Metal (% by weight)

C	Mn	Si	Cr	Ni	Mo	S	P	Cu
≤ 0.15	1.0 – 2.5	≤ 0.03-0.65	28.0 – 32.0	8.0 – 10.5	≤ 0.75	≤ 0.035	≤ 0.025	≤ 0.75

2. Typical Mechanical Properties of Weld Metal

Property	UTS (MPa)	Yield Strength (MPa)	Elongation (%)	Impact Toughness (J @ RT)
Typical Values	650 – 750	420 – 500	30 – 35	50 – 70

3. Recommended Welding Parameters

Process	Diameter (mm)	Current (A)	Voltage (V)	Shielding Gas	Polarity	Gas Flow (L/min)
TIG (GTAW)	1.6 – 3.2	70 – 180	—	100% Ar	DCEN	8 – 12
MIG (GMAW)	0.8 – 1.6	100 – 280	22 – 32	98% Ar + 2% O₂ or Ar + 2% CO₂	DCEP	12 – 20

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