Stainless Steel

JACKSUN NOVA 347Si

AWS/ASME: A5.9 ER347 / ER347Si

JACKSUN NOVA 347Si is a niobium-stabilized austenitic stainless steel solid wire for MIG (GMAW) and TIG (GTAW) welding.
It is designed for welding stabilized stainless steels (such as 321 and 347), especially where intergranular corrosion resistance is required.
The niobium (Nb) addition stabilizes the weld metal against carbide precipitation.
Higher silicon (Si) content improves wetting, bead appearance, and arc stability.
Recommended for chemical plants, refineries, food & beverage industry, and high-temperature service.

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

C	Mn	Si	Cr	Ni	Nb + Ta	S	P	Cu
≤ 0.08	1.0 – 2.5	0.65 – 1.00	19.0–21.5	9.0 – 11.0	10 × C – 1.0	≤ 0.035	≤ 0.025	≤ 0.75

2. Typical Mechanical Properties of Weld Metal

Property	UTS (MPa)	Yield Strength (MPa)	Elongation (%)	Impact Toughness (J @ -20 °C)
Typical Values	520 – 650	380 – 450	30 – 35	40 – 60

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	Ar + 2% O₂ or Ar + CO₂ (98/2)	DCEP	12 – 20

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