Lincoln Fleetweld 5P+ is the industry benchmark E6010 cellulosic-coated SMAW electrode for open-root pipe welding, cross-country pipeline construction, and structural field repair. Classified to AWS A5.1/A5.1M E6010, Fleetweld 5P+ delivers a stiff, driving arc with deep penetration and fast-freeze slag that provides superior weld pool control in all positions — overhead, vertical-up, and vertical-down. Its cellulosic coating burns aggressively to cut through mill scale, rust, dirt, and moisture-contaminated surfaces without sacrificing bead quality, making it the first-choice root-pass electrode wherever surface prep is limited. DC+ (DCEP) power only; not designed for AC service. WeldingMart is a Lincoln Electric authorized distributor offering factory-fresh stock across all diameters and package formats.
| AWS classification | AWS A5.1/A5.1M E6010 |
|---|---|
| Coating type | Cellulosic (high-cellulose sodium) |
| Polarity | DC+ (DCEP) only |
| Welding positions | All positions: 1G, 2G, 3G, 4G (flat, horizontal, vertical, overhead) |
| Minimum tensile strength | 60,000 psi (414 MPa) |
| Minimum yield strength | 48,000 psi (331 MPa) |
| Elongation | 22% minimum |
| Charpy V-notch impact | Not required by AWS A5.1 for E6010 |
| Typical current range | 3/32 in: 50–90 A | 1/8 in: 75–125 A | 5/32 in: 110–165 A | 3/16 in: 140–210 A | 7/32 in: 170–250 A | 1/4 in: 210–320 A |
| Available diameters | 3/32, 1/8, 5/32, 3/16, 7/32, 1/4 in |
| Manufacturer | Lincoln Electric |
| Standards compliance | AWS A5.1/A5.1M; AWS D1.1 pre-qualified |
Fleetweld 5P+ is the dominant electrode for cross-country pipeline root passes and structural field repair where surface condition, position access, and weld quality cannot be compromised. Typical applications include:
- Oil and gas pipeline: API 1104 root passes on carbon steel line pipe, cross-country mainline and tie-in spools
- Structural fabrication: AWS D1.1 structural steel, heavy plate tack and root passes
- Field repair and maintenance: Dirty, rusty, or painted steel where surface prep is impractical — farm equipment, railcar repair, construction equipment
- Galvanized and mill-scaled steel: The driving arc burns through coatings that would cause porosity in rutile electrodes
- Shipbuilding and offshore: Root passes on hull plate and structural members in all-position environments
E6010 requires higher open-circuit voltage and a more aggressive arc technique than rutile or low-hydrogen electrodes. Key running tips:
- Machine requirement: Use a constant-current (CC) DC+ source with OCV ≥ 65 V. Inverter machines must be E6010-rated; not all inverters handle cellulosic electrodes reliably.
- Arc start: Scratch-start or use the machine's lift-arc mode. Maintain a short arc length equal to approximately the rod diameter.
- Arc length control: Keep the arc tight. A long arc with E6010 causes porosity and loss of penetration. "Whip and pause" technique (1–2× rod diameter whip, pause to allow freeze) is standard for vertical welding.
- Travel angle: 5–10° drag angle for flat and horizontal; vertical-up 5–10° push with whip-and-pause; vertical-down 15–20° push for fast downhill pipe root passes.
- Interpass temperature: Follow applicable code (AWS D1.1 or API 1104). Preheat per base material carbon equivalent for higher CE steels.
- Slag removal: The fast-freeze slag chips easily with a chipping hammer; wire brush between passes.
E6010 is a cellulosic electrode — it requires moisture in the coating for optimal arc performance and is not a low-hydrogen electrode. Unlike E7018, E6010 should not be stored in a drying oven. Recommended storage:
- Store in original sealed container in a dry area at ambient temperature (40–120°F / 4–49°C)
- Do not overbake — oven temperatures that work for E7018 will destroy the cellulosic coating and cause arc instability
- Electrodes exposed to wet conditions can be air-dried at room temperature; do not use wet rods
- Once opened, use within a reasonable period and reseal packaging if storing partially used cartons
- What is E6010 used for?
- E6010 is the standard electrode for open-root pipe welding in oil and gas and structural applications. Its cellulosic coating creates a driving, fast-freeze arc that provides complete root fusion in all positions — particularly for API 1104 pipeline root passes and AWS D1.1 structural root runs where radiographic quality is required.
- Can I run E6010 on an AC welder?
- No. E6010 is DC+ (DCEP) only. For AC welding machines, use Lincoln Fleetweld 7 (E6011), which is formulated for AC and DC operation. Not all inverter machines support E6010 — confirm your machine lists E6010 compatibility before purchasing.
- What is the difference between 6010 and 6011?
- Both are 60 ksi cellulosic all-position electrodes, but E6010 is DC+ only with a stiffer, more penetrating arc. E6011 adds potassium to the coating allowing stable AC operation, making it more versatile on older farm machines and transformer-based welders. For critical pipe root passes on DC, E6010 is preferred for arc stability and penetration control.
- What is the difference between 6010 and 7018?
- E6010 is a fast-freeze cellulosic electrode used primarily for root passes; E7018 is a low-hydrogen iron-powder electrode used for fill and cap passes on structural and pressure vessel code work. Many pipeline welding procedures call for an E6010 root pass followed by E7018 fill and cap — pair the Fleetweld 5P+ root with Lincoln Excalibur 7018 hot pass and fill.
- Does Fleetweld 5P need oven storage?
- No. Fleetweld 5P+ (E6010) is a cellulosic electrode — it relies on inherent coating moisture for proper arc performance and should never be stored in a drying oven. Store sealed at ambient temperature. This is the opposite of E7018 low-hydrogen rods, which require oven storage after opening.
- What sizes does Lincoln Fleetweld 5P+ come in?
- WeldingMart stocks Fleetweld 5P+ from 3/32 in (2.4 mm) through 1/4 in (6.4 mm) diameter in 1-lb hobby packs, 5-lb and 10-lb cartons, and 50-lb master cases. Select the diameter and pack size in the variant selector above.
Browse the full electrode range: Stick Welding Electrodes & Rods — or pair your E6010 root pass with Lincoln Excalibur 7018 for fill and cap.