ER309LSi MIG & TIG Welding Wire

The ER309LSi MIG & TIG Welding Wire welding wire from Metals And Welding Specialities is a premium-grade stainless steel filler metal designed for precision, durability, and superior corrosion resistance. Classified under UNS S30983 and ASTM A580 Grade ER309LSi, this wire is engineered to deliver exceptional performance in joining dissimilar metals, particularly when welding stainless steel to mild or carbon steel. Its low carbon content minimizes carbide precipitation, making it ideal for applications that require excellent resistance to intergranular corrosion.

Manufactured to meet international standards, ER309LSi features a higher silicon content that enhances arc stability and wetting action. This results in smooth, clean weld beads with minimal spatter and outstanding appearance. The silicon addition also improves fluidity and slag removal, helping welders achieve consistent, high-quality results even in demanding environments. Metals And Welding Specialities ensures strict quality control at every production stage, providing wire with uniform chemistry and consistent feeding characteristics, suitable for both MIG (GMAW) and TIG (GTAW) welding processes.

This filler metal is widely used in industries such as petrochemical, power generation, food processing, and marine fabrication. Its unique composition allows it to maintain integrity under high-temperature and corrosive conditions. The ER309LSi is particularly effective when joining 304 or 308 stainless steels to carbon or low-alloy steels, offering strong mechanical properties and excellent oxidation resistance up to 850°C (1560°F). The low carbon version (LSi) reduces the risk of sensitization, ensuring longer service life in welded joints exposed to harsh chemical or thermal environments.

In MIG welding applications, the ER309LSi wire provides stable metal transfer and fine droplet formation, leading to improved bead appearance and less post-weld cleaning. In TIG welding, it offers smooth flow characteristics and precise control, essential for critical applications requiring clean, aesthetically sound welds. Because of its versatility and superior metallurgical properties, it’s a top choice for fabricators handling multi-metal projects or repair work where stainless and carbon steels meet.

At Metals And Welding Specialities, quality and reliability are at the core of every product. The AWS Class ER309LSi welding wire is produced to meet the highest industry standards, ensuring consistent weldability and mechanical performance. Whether used in structural fabrication, pressure vessels, or process piping, this wire provides a dependable solution for welders who demand precision and consistency in every joint.

• Specification ER309LSi MIG & TIG Welding Wire

  Classification	AWS A5.9, ER309LSi
  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 ER309LSi 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	Oxford Alloys	SANDVIK	BOHLER	UTP
  ER309LSi	S30988	Alloy 309LSi	EXATON 24.13.LSI	BOHLER THERMAINT 25/14 E-309LSI	UTP A6824 LC

• ER309LSi MIG & TIG Welding Wire Chemical Composition

  C	Cr	Ni	Mo	Mn	Si	P	S	Cu
  0.12	23.0-25.0	12.0-14.0	0.75	1.0-2.5	0.65-1.00	0.03	0.03	0.75

• ER309LSi MIG & TIG Welding Wire Parameters

  Diameter		Process	Volt	Amps
  in	(mm)
  .023	(0.6)	GMAW	14-19	30-85
  .030	(0.8)	GMAW	15-20	45-125
  .035	(0.9)	GMAW	16-22	60-150
  .045	(1.14)	GMAW	17-22	90-210
  1/16”	(1.6)	GTAW	12	80-150
  3/32”	(2.4)	GTAW	12	150-250
  1/8”	(3.2)	GTAW	12	200-375

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