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ER308LSi Stainless Steel Solid Welding Wire

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1. Description & Applications

ER308LSi is an ultra-low carbon stainless steel solid welding wire designed for Gas Metal Arc Welding (MIG/GMAW) and Gas Tungsten Arc Welding (TIG/GTAW).

  • High Silicon Content (Si 0.65-1.00%): Improves puddle fluidity, arc stability, and wetting action, resulting in smooth weld bead appearance with minimal spatter.
  • Extra Low Carbon (C ≤ 0.03%): Reduces the risk of intergranular carbide precipitation, offering superior resistance to intergranular corrosion.
  • Key Applications:
    • Welding 18Cr-8Ni stainless steels such as AISI 304, 304L, 301, 302, 308, and 308L.
    • Food and beverage processing equipment, pharmaceutical machinery, chemical storage tanks, pressure vessels, and architectural fabrication.

2. Classification & International Standards

  • AWS A5.9 / ASME SFA-5.9: ER308LSi
  • EN ISO 14343-A: G 19 9 L Si / W 19 9 L Si
  • GB/T 17854: H03Cr19Ni10Si1

3. Chemical Composition of Weld Metal (wt %)

Element C Si Mn Cr Ni Mo P S Cu
AWS A5.9 Spec ≤ 0.03 0.65 – 1.00 1.00 – 2.50 19.5 – 22.0 9.0 – 11.0 ≤ 0.75 ≤ 0.030 ≤ 0.030 ≤ 0.75
Typical Value 0.018 0.82 1.75 20.10 10.15 0.12 0.015 0.008 0.10

4. Mechanical Properties of All-Weld Metal

Property Tensile Strength Rm (MPa) Yield Strength Rp0.2 (MPa) Elongation A5 (%) Impact Energy KV (J) at -196°C
Standard Requirement ≥ 520 ≥ 350 ≥ 35 -
Typical Values 580 – 610 410 – 440 40 – 43 > 60 J

5. Recommended Welding Parameters

A. MIG Welding (GMAW)

Wire Diameter (mm) Welding Current (A) Welding Voltage (V) Transfer Mode
0.8 mm 60 – 140 16 – 21 Short Circuit / Spray
1.0 mm 90 – 210 18 – 24 Spray Transfer
1.2 mm 140 – 260 20 – 28 Spray Transfer
1.6 mm 190 – 320 24 – 32 Spray Transfer

B. TIG Welding (GTAW)

Rod Diameter (mm) Welding Current (A) Welding Voltage (V) Length (mm)
1.6 mm 50 – 120 10 – 14 1000 mm
2.0 mm 80 – 160 12 – 16 1000 mm
2.4 mm 100 – 200 14 – 18 1000 mm
3.2 mm 150 – 250 16 – 20 1000 mm

4.1 Welding Positions

All positions (flat, horizontal, vertical, overhead)

5. Usage Notes

  1. Pre-weld cleaning: thoroughly remove rust, moisture, oil, and dirt from the welding area; use a stainless-steel dedicated wire brush.
  2. Interpass temperature: recommended ≤150°C.
  3. Wind protection: when welding outdoors with wind speed >1.5 m/s, use wind shielding to prevent porosity.
  4. Arc length: short arc, spray arc, or pulsed arc recommended; pulsed arc preferred.
  5. Polarity: MIG uses DC+ (electrode positive)

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