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A TIG filler rod ER347 stainless steel is a thin, solid metal rod used in TIG welding to join pieces of stainless steel together. It is made of a specific type of stainless steel that is formulated to be strong, corrosion-resistant, and able to withstand high temperatures.

ER347 stainless steel is a type of austenitic stainless steel that contains chromium, nickel, and niobium. The niobium is what gives ER347 its superior resistance to intergranular corrosion, which is a type of corrosion that can occur in stainless steel when it is heated to high temperatures.

TIG filler rods ER347 are available in a variety of diameters, typically ranging from 1/16 inch to 1/8 inch. The diameter of the rod you choose will depend on the thickness of the material you are welding.

To use a TIG filler rod ER347, you will need a TIG welder and a shielding gas, such as argon. The TIG welder will create an electric arc that will melt the filler rod and the base metal, allowing you to join the two pieces of metal together. The shielding gas will protect the weld from contamination.