Alloy 309LMo MIG & TIG

Alloy 309LMo is a high-alloy stainless steel welding wire specially designed by Metals And Welding Specialities for superior corrosion and heat resistance in demanding applications. It is widely used for joining dissimilar steels and for overlaying mild or low-alloy steels where enhanced oxidation and scaling resistance is required. This alloy contains a balanced composition of chromium, nickel, and molybdenum, offering excellent strength and toughness even at elevated temperatures. Classified under UNS S30983 and conforming to ASTM A580 / A240 Grade 309LMo, it meets the highest international standards for reliability and weld integrity.

This 309LMo MIG & TIG filler wire is known for its low carbon content, which minimizes carbide precipitation during welding and ensures exceptional resistance to intergranular corrosion. The addition of molybdenum enhances pitting resistance in chloride-rich environments, making it ideal for chemical processing plants, pulp and paper industries, and marine structures. Metals And Welding Specialities supplies this product with consistent mechanical properties and precise chemical balance to guarantee stable arc performance and smooth weld bead appearance in both MIG and TIG operations.

When used in TIG welding, Alloy 309LMo provides clean welds with minimal spatter, allowing for precise control in critical fabrications. In MIG applications, it delivers high deposition efficiency and excellent fusion, reducing post-weld finishing time. This wire exhibits strong resistance to oxidation up to 1000°C (1832°F) and maintains its strength in cyclic thermal conditions. It is an excellent choice for joining stainless steels such as 304, 316, or 347 to carbon or mild steels, as well as for hardfacing components exposed to aggressive media or thermal fatigue.

Each batch of Metals And Welding Specialities Alloy 309LMo welding wire is manufactured under stringent quality control processes to ensure purity, consistency, and adherence to international welding standards. The product is available in a range of diameters to suit various industrial welding needs and can be supplied in spools or cut lengths. Its reliable weldability, crack resistance, and smooth metal transfer characteristics make it a trusted choice for fabricators worldwide.

By combining advanced metallurgical engineering with decades of expertise, Metals And Welding Specialities delivers a product that enhances weld performance, reduces rework, and increases service life in corrosive and high-temperature environments. Whether used for fabrication, maintenance, or cladding applications, Alloy 309LMo MIG & TIG wire ensures outstanding results with superior metallurgical integrity and corrosion resistance.

• Specification Alloy 309LMo MIG & TIG

  Classification	AWS A5.9, 309LMo
  Form	MIG spools, TIG cut lengths, Reels and Coils
  Type Of Welding	Inert Gas Welding
  Current	MIG-DCEP / TIG-DCEN
  Diameters	.023”, .030”, .035”, .045”, 1/16”, 3/32”, 1/8”
  Standard TIG straight lengths are available	36” (914 mm) or 39” (1000 mm) lengths. Other lengths available upon request.
  AWS 309LMo MIG & TIG Filler Metal Application & uses	Hardware tools Metallurgy Machinery Construction Shipbuilding Petroleum Chemical plant Power sector Gas Industry

• Equivalent Grade Of AWS ERCuNi MIG & TIG

  Class	UNS	BOHLER
  309LMo	S30988	BOHLER BOHLER CN 23/12 MO

• Alloy 309LMo MIG & TIG Chemical Composition

  C	Mn	Si	Cr	Ni	S	P	Mo	Cu
  0.03 max	1.0-2.5	0.30-0.65	23-25	12-14	0.03 max	0.03 max	2-3	0.75 max

• Alloy 309LMo MIG & TIG Parameters

  Diameter		Process	Volt	Amps	Shielding Gas
  in	(mm)
  .035	0.9	GMAW	22-23	180-210	Spray Transfer 98% Argon / 2% Oxygen
  .045	1.2	GMAW	23-25	195-260
  1/16	1.6	GMAW	25-28	260-390
  .035	0.9	GMAW	19-23	55-170	Short Circuiting Transfer 90% Helium / 7 ½ % Argon / 2 ½ CO2
  .045	1.2	GMAW	19-23	100-185
  1/16	1.6	GMAW
  1/16	1.6	GTAW	14-18	90-130	100% Argon
  3/32	2.4	GTAW	15-20	120-175	100% Argon
  1/8	3.2	GTAW	15-20	150-220	100% Argon

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