Harris 309L is an AWS A5.4/A5.4M E309L-16 austenitic stainless steel SMAW electrode for dissimilar metal welding and cladding on DC+ (DCEP) in all positions. With a nominal composition of 23% Cr and 13% Ni — significantly higher than the 18% Cr / 10% Ni of Type 308L — E309L-16 is formulated to tolerate high dilution from carbon steel base metals while maintaining an austenitic, ductile weld deposit with adequate corrosion resistance. This makes Harris 309L the standard electrode for joining austenitic stainless steel to carbon steel (the most common stainless-to-carbon dissimilar joint), for overlay cladding of carbon steel with stainless, and for welding Type 309 and 310 high-temperature stainless base metals. The extra-low carbon "L" grade prevents sensitization in applications where heat-affected zone corrosion must be controlled.
AWS classification |
AWS A5.4/A5.4M E309L-16 |
|---|---|
Coating type |
Lime/titania (-16 type) |
Polarity |
DC+ (DCEP) preferred; AC acceptable |
Welding positions |
All positions (F, H, V, OH) |
Weld metal carbon (max) |
0.04% C (extra-low carbon "L" grade) |
Weld metal Cr content |
22.0–25.0% Cr |
Weld metal Ni content |
12.0–14.0% Ni |
Min tensile strength |
80,000 psi (552 MPa) |
Min yield strength |
58,000 psi (400 MPa) |
Elongation |
30% minimum |
Typical current range |
3/32 in: 40–75 A | 1/8 in: 60–100 A | 5/32 in: 80–130 A |
Manufacturer |
Harris Products Group |
Standards compliance |
AWS A5.4/A5.4M E309L-16 |
Dissimilar metal welding — stainless to carbon steel: The primary use of E309L — joining 304 or 316 stainless steel to A36, A572, or other carbon steel structural members. The higher Cr and Ni content compensates for dilution from the carbon steel base metal, maintaining an austenitic deposit.
Stainless cladding of carbon steel: Applying a corrosion-resistant stainless overlay on carbon steel vessels, tanks, or structural members. First and second-layer cladding passes on carbon steel use 309L; subsequent layers use 308L or 316L to match the final service requirements.
Welding Type 309 and 309S stainless base metal: E309L-16 is the matched composition filler for 309 and 309S high-temperature austenitic stainless steel used in heat shields, furnace components, and high-temperature process equipment up to approximately 2000°F (1093°C).
Buffer layer before hard surfacing: E309L is used as a transitional buffer layer when applying hard-facing overlays (e.g., chrome carbide) to stainless steel base metals to minimize dilution-related cracking
Repair welding on unknown stainless alloys: When the exact stainless base metal grade is uncertain, E309L's overmatched composition provides a safe choice that accommodates dilution from a range of stainless and near-stainless base metals
Amperage: 60–100 A for 1/8 in on DC+. Keep heat input low for dissimilar joints — high heat input increases dilution from the carbon steel base metal, which can shift the deposit chemistry toward martensite and cause cracking. Stringer beads are essential.
Polarity: DC+ (DCEP) standard. The "-16" suffix permits AC when required.
Dissimilar joint setup: For stainless-to-carbon joints, position the arc slightly toward the stainless side to reduce carbon steel dilution into the first-pass deposit. The high-Cr, high-Ni composition of 309L is specifically designed to compensate for this dilution effect.
Cladding technique: Apply the first clad layer with 309L using stringer beads with high travel speed and low amperage to minimize carbon steel dilution. Apply the second layer (also 309L or 308L depending on service) perpendicular to the first layer. Final service layer uses the appropriate matched filler (308L for 304 service, 316L for 316 service).
Interpass temperature: Maximum 350°F (177°C) for austenitic stainless deposited on carbon steel. Allow cooling between passes, especially on thick dissimilar joints.
Contamination prevention: Dedicated stainless brushes and grinding wheels only. Carbon steel contamination of the 309L deposit at the stainless side causes rust staining and compromises the cladding's corrosion resistance.
Store in original sealed packaging in dry, clean conditions; keep separate from carbon steel electrodes
If moisture exposure has occurred, dry at 300–400°F (150–200°C) for 1 hour
No routine oven storage required; spot oven storage at 250°F for critical dissimilar joints in restrained configurations
Primary use — dissimilar: Austenitic stainless (304, 316, 308) to carbon steel (A36, A572, A516); 309L to 309L; stainless to low-alloy steel
Cladding: First and second layer on carbon steel vessels, heat exchangers, and structural members requiring corrosion-resistant stainless overlay
High-temperature applications: Type 309 and 309S stainless steel in service up to approximately 2000°F
Not for matching 304/316 in standard corrosive service: For all-stainless joints in standard food, chemical, or marine service, use matched filler (308L for 304, 316L for 316) — 309L's higher alloy content is not needed and adds unnecessary cost
What is E309L stainless welding rod used for?
Harris 309L (E309L-16) is primarily used for joining stainless steel to carbon steel (the most common dissimilar metal weld in fabrication), for cladding carbon steel with stainless overlays, and for welding Type 309/309S high-temperature stainless base metals. The higher Cr-Ni content tolerates carbon steel dilution without losing austenitic microstructure.
Can you use 309L to weld 304 stainless steel?
Yes, E309L can weld 304 stainless to 304 stainless — the higher alloy content is acceptable in a 304 joint. However, for 304-to-304 welds in standard service, E308L is the cost-optimized matched filler. Use 309L for 304 joints only when the design involves carbon steel dilution (dissimilar joint), cladding, or when the welding code or WPS specifies 309L for overmatching reasons.
What is the difference between 308L and 309L welding rod?
E308L is formulated to match 304/308 stainless base metal compositions for similar-metal welds. E309L has approximately 23% Cr and 13% Ni (vs. 20% Cr / 10% Ni for 308L) — the extra alloy content compensates for dilution from carbon steel in dissimilar joints, maintaining an austenitic deposit. Use 308L for 304-to-304 welds; use 309L for 304-to-carbon-steel or cladding.
What polarity does E309L-16 use?
DC+ (DCEP) is preferred for E309L-16 for stable arc and optimal deposit properties. The "-16" coating permits AC when DC is unavailable, though DC+ is always the first choice in shop environments.
Is 309L good for stainless to mild steel welding?
Yes — that is the primary application of E309L. When welding 304 or 316 stainless to A36 or A572 carbon steel, the dilution from the carbon steel base metal would cause an E308L deposit to shift toward a martensitic microstructure. E309L's overmatched Cr and Ni maintain an austenitic, ductile deposit despite carbon steel dilution. For this dissimilar joint, E309L is the industry standard.
Can 309L be used for high temperature service?
Yes. E309/309L deposits are acceptable for high-temperature service up to approximately 2000°F (1093°C) when used to weld Type 309 or 309S base metal. For applications above 1200°F where 309 base metal is not used, consider whether E310-16 or other high-alloy fillers are more appropriate for the specific service temperature and atmosphere.
How many layers of 309L do I need for carbon steel cladding?
For standard stainless cladding of carbon steel, the typical approach is: one or two layers of E309L to build up the transition layer and compensate for dilution, followed by the final service layer in the specified stainless filler (E308L for 304 service, E316L for 316 service). The number of 309L layers depends on dilution level — for low-dilution SMAW at low amperage with stringer beads, two layers of 309L typically provide sufficient barrier before transitioning to the service-grade filler.
Browse all stick electrodes: Stick Welding Electrodes & Rods — compare with Harris 308L for 304 stainless-to-stainless welding, or Harris 316L for 316 stainless in marine and chloride service.
Harris E309L stainless welding rods are in stock and ship from WeldingMart. Add this product to your cart to place your order — in-stock items ship same day. Create a WeldingMart account to track your order, access your product purchase history, and reorder without re-entering shipping details. E309L is stocked in multiple package sizes to serve both one-time project needs and ongoing production welding operations. Review your order at checkout to confirm the correct diameter and quantity. For dissimilar-metal joining projects, our product specialists can advise on quantity and package selection before you order.
When selecting stick electrodes, welders should reference the relevant welding standard and process documentation. Key technical considerations include test, smaw. Always consult the electrode manufacturer's data sheet and applicable AWS, ASME, or structural welding codes for your specific application. WeldingMart provides technical resources to support your electrode selection and welding process qualification.
When selecting stick electrodes, welders should reference the relevant welding standard and process documentation. Key technical considerations include test, smaw. Always consult the electrode manufacturer's data sheet and applicable AWS, ASME, or structural welding codes for your specific application. WeldingMart provides technical resources to support your electrode selection and welding process qualification.
Harris E309L is available in multiple electrode diameters. Selecting the correct diameter for your base metal thickness is critical for weld quality and penetration depth.
| Electrode Diameter | Base Metal Range | Amperage Range | Best Position |
|---|---|---|---|
| 3/32 in (2.4 mm) | 3/32 in to 1/4 in (2.4–6.4 mm) | 40–80 A | All positions |
| 1/8 in (3.2 mm) | 1/8 in to 3/8 in (3.2–9.5 mm) | 75–130 A | All positions |
The 1/8 in (3.2 mm) diameter is the most versatile option for general fabrication on material from 3/16 in to 3/8 in thickness. Use 3/32 in for sheet metal and thin sections where 1/8 in would cause excessive heat input. Use 5/32 in for heavier sections where higher deposition rates reduce total welding time. For most structural repair and field work, 1/8 in is the preferred starting diameter.
When ordering Harris E309L in 3/32 in, 1/8 in, or 5/32 in, select the correct diameter variant from the product page before adding to cart. Each diameter is a separate product variant with its own SKU — confirm you have selected the right 1/8 in, 3/32 in, or 5/32 in size before placing your order.
Additional technical considerations for Harris E309L include: steels, e309l 16, 16 stainless steel, stainless stick electrodes, review, low alloy steels, alloy steels, current, joining stainless steels, size, ideal. Welders should review the product data sheet for complete welding procedure specifications. Key process parameters such as preheat requirements, interpass temperature, and post-weld heat treatment requirements vary by base metal composition and application code requirements. Consult AWS, ASME, or applicable structural welding codes for code-compliant welding procedures.
For best results, store electrodes in a dry environment and use within manufacturer recommended timeframes after opening. Proper electrode storage and handling directly impacts weld quality — follow manufacturer guidance for oven temperatures and rod reconditioning procedures as applicable to this electrode classification.
Harris E309L is available in multiple electrode diameters. Selecting the correct diameter for your base metal thickness is critical for weld quality and penetration depth.
| Electrode Diameter | Base Metal Range | Amperage Range | Best Position |
|---|---|---|---|
| 3/32 in (2.4 mm) | 3/32 in to 1/4 in (2.4–6.4 mm) | 40–80 A | All positions |
| 1/8 in (3.2 mm) | 1/8 in to 3/8 in (3.2–9.5 mm) | 75–130 A | All positions |
The 1/8 in (3.2 mm) diameter is the most versatile option for general fabrication on material from 3/16 in to 3/8 in thickness. Use 3/32 in for sheet metal and thin sections where 1/8 in would cause excessive heat input. Use 5/32 in for heavier sections where higher deposition rates reduce total welding time. For most structural repair and field work, 1/8 in is the preferred starting diameter.
When ordering Harris E309L in 3/32 in, 1/8 in, or 5/32 in, select the correct diameter variant from the product page before adding to cart. Each diameter is a separate product variant with its own SKU — confirm you have selected the right 1/8 in, 3/32 in, or 5/32 in size before placing your order.
Additional technical considerations for Harris E309L include: e309l 16, steels, 16 stainless steel, stainless stick electrodes, low alloy steels, review, current, alloy steels, joining stainless steels, ideal. Welders should review the product data sheet for complete welding procedure specifications. Key process parameters such as preheat requirements, interpass temperature, and post-weld heat treatment requirements vary by base metal composition and application code requirements. Consult AWS, ASME, or applicable structural welding codes for code-compliant welding procedures.
For best results, store electrodes in a dry environment and use within manufacturer recommended timeframes after opening. Proper electrode storage and handling directly impacts weld quality — follow manufacturer guidance for oven temperatures and rod reconditioning procedures as applicable to this electrode classification.
Harris E309L is available in multiple electrode diameters. Selecting the correct diameter for your base metal thickness is critical for weld quality and penetration depth.
| Electrode Diameter | Base Metal Range | Amperage Range | Best Position |
|---|---|---|---|
| 3/32 in (2.4 mm) | 3/32 in to 1/4 in (2.4–6.4 mm) | 40–80 A | All positions |
| 1/8 in (3.2 mm) | 1/8 in to 3/8 in (3.2–9.5 mm) | 75–130 A | All positions |
The 1/8 in (3.2 mm) diameter is the most versatile option for general fabrication on material from 3/16 in to 3/8 in thickness. Use 3/32 in for sheet metal and thin sections where 1/8 in would cause excessive heat input. Use 5/32 in for heavier sections where higher deposition rates reduce total welding time. For most structural repair and field work, 1/8 in is the preferred starting diameter.
When ordering Harris E309L in 3/32 in, 1/8 in, or 5/32 in, select the correct diameter variant from the product page before adding to cart. Each diameter is a separate product variant with its own SKU — confirm you have selected the right 1/8 in, 3/32 in, or 5/32 in size before placing your order.
Additional technical considerations for Harris E309L include: e309l 16, steels, 16 stainless steel, stainless stick electrodes, low alloy steels. Welders should review the product data sheet for complete welding procedure specifications. Key process parameters such as preheat requirements, interpass temperature, and post-weld heat treatment requirements vary by base metal composition and application code requirements. Consult AWS, ASME, or applicable structural welding codes for code-compliant welding procedures.
For best results, store electrodes in a dry environment and use within manufacturer recommended timeframes after opening. Proper electrode storage and handling directly impacts weld quality — follow manufacturer guidance for oven temperatures and rod reconditioning procedures as applicable to this electrode classification.