E6010 Cellulose Stick Welding Electrode — Technical Specification
Comprehensive technical specification for E6010 cellulose stick welding electrodes, covering properties, sizing, machinability, defects, and handling for Canadian fabrication.
Material Overview & Common Uses
E6010 is a cellulose-based stick welding electrode classified under AWS A5.1 / CSA W48. It features a high-cellulose sodium coating that produces a deep, penetrating arc with a forceful, digging action. This electrode is specifically designed for welding in all positions, especially vertical-down (stovepipe) techniques used in pipeline and structural fabrication. Common applications include: root passes on API 5L pipe (X42–X70), structural steel erection, shipbuilding, repair welding on galvanized or painted surfaces, and general fabrication where high penetration and fast-freeze slag are required. The electrode operates on DC+ (electrode positive) polarity and is known for its ability to burn through rust, mill scale, and light coatings. It is not recommended for high-strength or low-temperature service without proper preheat and post-weld heat treatment.
Core Technical Properties & Sizing
| Property | Specification |
|---|---|
| AWS Classification | E6010 (CSA W48 equivalent) |
| Tensile Strength | 60,000 psi (414 MPa) minimum as welded |
| Yield Strength | 50,000 psi (345 MPa) typical |
| Elongation | 22–28% in 2 inches |
| Impact Toughness | 20–40 ft·lbf at -20°F (-29°C) typical (not certified for low-temp service) |
| Hardness | 80–90 HRB typical weld deposit |
| Coating Type | High cellulose sodium (15–20% cellulose by weight) |
| Polarity | DC+ (electrode positive) only |
| Available Diameters (Canadian stock) | 1/8″ (3.2 mm), 5/32″ (4.0 mm), 3/16″ (4.8 mm), 1/4″ (6.4 mm) – also 3/32″ (2.4 mm) for thin sheet |
| Standard Length | 14 inches (356 mm) for 1/8″ and 5/32″; 18 inches (457 mm) for 3/16″ and 1/4″ |
| Packaging | 10 lb (4.5 kg) plastic resealable tubes, 50 lb (22.7 kg) cardboard cartons, or 100 lb (45.4 kg) bulk drums |
| Storage Condition | Must be kept in dry, heated storage (above 10°C / 50°F) with low humidity (<60% RH). Opened containers should be resealed or electrodes stored in a rod oven at 120–150°F (49–66°C). |
| Shelf Life | 2 years from date of manufacture if stored properly; degraded coating (powdery, cracked) indicates moisture loss and reduced performance. |
Machinability, Tooling & Feeds
E6010 is not machined but deposited via SMAW (shielded metal arc welding). The electrode's cellulosic coating produces a deep, penetrating arc that requires specific technique. Below are the recommended parameters:
| Parameter | Recommendation |
|---|---|
| Electrode Diameter | 1/8″, 5/32″, 3/16″, 1/4″ (3.2–6.4 mm) |
| Amperage Range (DC+) | 1/8″: 75–125 A; 5/32″: 110–160 A; 3/16″: 140–200 A; 1/4″: 180–250 A |
| Arc Length | 1/16–1/8 inch (tight) |
| Travel Speed | 10–18 inches per minute for 1/8″ diameter (adjust for other sizes) |
| Electrode Angle | 5–15° drag for flat/horizontal; 0–5° push for vertical-up |
| Technique | Whip-and-pause for vertical-down pipe welding; steady drag for flat/horizontal |
| Preheat | Not required for thicknesses under 1″ (25 mm) in mild steel. For thick sections or high-restraint joints: 150–300°F (66–149°C) |
| Spatter Level | High – anti-spatter spray recommended for production work |
| Slag Removal | Fast-freezing, self-peeling on clean steel; light chipping on dirty surfaces |
Common Defects & Quality Control
| Defect / Issue | Cause & Description |
|---|---|
| Porosity | Moisture in coating (improper storage) or excessive arc length |
| Undercut | Excessive amperage or travel speed, especially in vertical-down |
| Slag Inclusions | Improper cleaning between passes or poor technique |
| Arc Blow | Magnetic arc deflection common in DC welding of thick sections or near edges |
| Cracking | High-restraint joints or high-carbon steels without preheat |
| Sticking | Amperage too low or damp electrode |
| Excessive Spatter | High amperage or long arc length |
| Quality Control Checks | Visual inspection, bend tests for ductility, macro-etch tests for penetration profile. For critical applications: radiographic or ultrasonic testing. Check electrode condition (coating cracks, powdery residue, rust on core wire). |
| Quick Test | Strike arc on scrap plate – good electrode starts easily and produces steady hissing arc with minimal popping. |
Storage, Handling & Racking Guidelines
| Parameter | Guideline |
|---|---|
| Storage Temperature | 10–25°C (50–77°F) |
| Relative Humidity | <60% RH |
| Rod Oven Temperature (if used) | 120–150°F (49–66°C) – do not exceed 200°F (93°C) |
| Rebaking | Not allowed – cellulose coating degrades above 200°F (93°C), causing loss of arc characteristics and increased spatter |
| Handling | Use clean, dry gloves to avoid contaminating the coating |
| Racking | Store in original packaging or sealed plastic tubes. For shop floor: portable rod caddy with desiccant pack |
| Environmental Precautions | Do not store near grinding operations or chemical fumes |
| Shelf Life | 2 years from manufacture if stored properly; after that, test sample for arc stability and coating integrity |
| Discard Criteria | Coating feels damp, shows white powdery residue, or core wire has rust |