347 Stainless Steel TIG Rods

347 Stainless Steel TIG Rods 

347 stainless steel TIG rods (classified as ER347) are niobium-stabilised austenitic stainless steel filler metals designed for welding stainless steels that are exposed to elevated temperatures and require enhanced resistance to intergranular corrosion. These rods are commonly used where components will operate in the 450°C–850°C temperature range, where standard stainless fillers may become susceptible to carbide precipitation. Supplied in 5Kg packs.

Why Use 347 Stainless TIG Rods?

Stabilised Against Intergranular Corrosion

ER347 rods are alloyed with niobium (columbium), which acts as a stabilising element. Niobium preferentially combines with carbon to form niobium carbides, preventing the formation of chromium carbides at grain boundaries.

This stabilisation helps to:

• Prevent sensitisation in the heat-affected zone

• Maintain corrosion resistance after welding

• Reduce the risk of intergranular corrosion

This makes 347 rods ideal for applications where welded components are exposed to sustained or cyclic high temperatures.

Designed for High-Temperature Service

347 TIG rods are specifically suited for welding materials such as 321 stainless steel and 347 stainless steel, which are commonly used in high-temperature environments. The weld metal retains strength and corrosion resistance under prolonged heat exposure.

Typical high-temperature benefits include:

• Improved resistance to oxidation

• Stability in thermal cycling conditions

• Retention of mechanical properties at elevated temperatures

Alternative to 321 Filler Metals

While 321 stainless steel is also stabilised (with titanium), 347 filler rods are often preferred because niobium provides more consistent stabilisation during welding. This ensures better weld integrity and long-term performance, especially in critical applications.

Resistance to Thermal Fatigue

347 weld deposits perform well in environments subject to repeated heating and cooling cycles. The stabilised microstructure helps resist:

• Thermal fatigue cracking

• Grain boundary degradation

• Loss of corrosion resistance over time

Smooth TIG Welding Characteristics

347 TIG rods offer excellent weldability, making them suitable for precision fabrication and critical welds:

• Stable and controllable arc

• Clean weld pool with good fluidity

• Low spatter and high-quality bead appearance

• Reliable fusion with minimal defects