Stainless Steel MIG Wire
BLUME® ER309Mo
BLUME® ER309Mo
Specification: ASME SFA/AWS A5.9 ER309Mo
Premium Corrosion-Resistant Solution for Dissimilar and Mo-Alloyed Stainless Welding
When your welding demands superior corrosion and pitting resistance, BLUME® ER309Mo MIG Wire delivers unmatched performance. Engineered with molybdenum (Mo) enhancement, it provides outstanding protection against aggressive environments, especially those containing chlorides, acids, and seawater.
Whether you’re joining stainless to carbon steel, overlaying corrosion-resistant cladding, or fabricating chemical and marine equipment, BLUME® ER309Mo ensures exceptional weld integrity, arc stability, and long-term durability— setting a new benchmark for reliability and finish.
BLUME® ER309Mo vs Standard ER309Mo

Key Features
Key Features
✅ Molybdenum-alloyed chemistry – Delivers superior resistance to pitting and crevice corrosion
✅ Excellent for dissimilar metal joints – Ideal for joining stainless to carbon or low-alloy steels
✅ Enhanced weld strength and ductility – Reduces cracking and distortion under stress
✅ Smooth, stable arc with low spatter – Ensures precise, professional results
✅ High corrosion resistance in harsh environments – Perfect for marine, chemical, and food industries
✅ BLUME® quality precision – Consistent wire feed, low fume generation, and clean bead appearance
Recommended Application
Recommended Application
✔ Welding stainless steel to carbon steel or low-alloy steel
✔ Cladding and overlay requiring enhanced corrosion protection
✔ Pressure vessels, chemical tanks, and piping systems
✔ Marine and offshore fabrication exposed to saltwater
✔ Food, beverage, and pharmaceutical equipment
✔ Heat exchangers and industrial processing units
Product Data Sheet
Product Data Sheet
FAQ
FAQ
Q: What is the advantage of molybdenum in ER309Mo MIG Wire?
A: Molybdenum significantly improves resistance to pitting, crevice, and stress corrosion cracking, especially in chloride-rich or acidic environments.
Q: Can BLUME® ER309Mo be used for joining stainless to carbon steel?
A: Yes – it’s specifically formulated for dissimilar metal welding, providing superior strength and corrosion resistance at the fusion line.
Q: What shielding gas is recommended for BLUME® ER309Mo?
A: Use 98% Argon + 2% Oxygen or 95–98% Argon + 2–5% CO₂ for optimal arc performance and bead wetting.
Q: Is BLUME® ER309Mo suitable for marine and chemical applications?
A: Absolutely – it’s designed for marine, offshore, chemical, and process industries, where resistance to saltwater and aggressive chemicals is critical.
Q: How does BLUME® ER309Mo differ from ER309L?
A: ER309Mo includes molybdenum, offering superior corrosion and pitting resistance, while ER309L focuses on low carbon content for intergranular corrosion prevention.
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