The Hobart ER308L is a premium quality solid MIG welding wire designed for the joining of austenitic stainless steels. Formulated with a nominal composition of 20% chromium and 10% nickel, this filler metal meets AWS A5.9 specifications. The ‘L’ designation indicates a controlled low carbon content (maximum 0.03%), which is critical for preventing carbide precipitation during the welding process. This feature significantly reduces the risk of intergranular corrosion (sensitization), particularly in the heat-affected zone (HAZ), making it the preferred choice for welding ASTM 304 and 304L grades.<\/p>\n
Metallurgically, the wire deposits weld metal with a ferrite number typically between 8 and 12, providing excellent resistance to cracking while maintaining good ductility. The inclusion of silicon enhances the fluidity of the weld pool (wetting action), resulting in flatter bead profiles and smoother tie-ins at the toes of the weld. This is particularly advantageous in fillet welds where contour control is essential for fatigue resistance and cleanliness.<\/p>\n
This 0.030-inch (0.8mm) diameter wire is precision layer-wound on a 2-pound spool, ensuring consistent wire cast and helix for reliable feeding through standard MIG gun liners. It is suitable for use with direct current electrode positive (DCEP) polarity. Recommended shielding gases include Argon\/CO2 blends (typically 98\/2 or 97\/3) for spray transfer or Tri-Mix (Helium\/Argon\/CO2) for short-circuit transfer modes, providing versatility across different material thicknesses and welding positions.<\/p>\n
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