IS 814 Part 1 : 2004Covered Electrodes for Manual Metal Arc Welding of Carbon and Carbon Manganese Steels - Part 1: For Welding of Steels Other Than Creep Resisting Steels

IS 814:2004 is the Indian Standard for Covered Electrodes for Manual Metal Arc Welding (MMAW / SMAW) of Carbon and Carbon Manganese Steel — Specification. It is the welding-electrode specification for shielded metal arc welding (the most common manual welding process in Indian fabrication).

Use it when: - Specifying welding electrodes for structural steel fabrication, pipe welding, pressure vessel construction - Procuring electrodes for shop / site welding of carbon and low-alloy steels - Auditing welding consumable supply — chemistry, mechanical properties, weldability - Welding qualification testing per IS 7307 — used to verify procedure correctness with selected electrodes - Investigating weld failures — electrode selection often a root cause

The electrode designation under IS 814 follows the pattern: E [tensile strength] [usability] [position] [drying class] — e.g., E 7016 H, E 6013, E 11018.

This system is broadly aligned with AWS A5.1 / AWS A5.5 (US) and EN ISO 2560 (European) — covered electrodes worldwide use similar classification systems.

Companion codes: - IS 814 Part 2 (now consolidated into Part 1 in 2004 revision) — Test methods for covered electrodes - IS 7307 Parts 1-3:1974/1989 — Approval testing of welding procedures + welders - IS 5462:1985 — Equipment for arc welding (machines + accessories) - IS 6419:1996 — Covered electrodes for welding alloy steels - IS 2879:1975 — Welding electrodes for use in submerged arc welding - IS 4944:1968 — Welding electrodes for surfacing applications - IS 11533:2007 — Welding consumables for high-strength steels

Designation system (Clause 4 of IS 814:2004):

E XX YZ: - E: Electrode - XX: Minimum tensile strength of deposited weld metal in kg/mm² (e.g., 41 = 410 MPa; 60 = 600 MPa; 70 = 700 MPa) - Y: Position designation - Z: Usability + drying class

Common designations and applications:

| Code | UTS min | Position | Coating type | Use | |---|---|---|---|---| | E 4101 | 410 MPa | All positions | Rutile (TiO₂) | Light fabrication; sheet metal; general purpose | | E 4103 | 410 MPa | All positions | Cellulose | Position welding (overhead, vertical); pipe | | E 4113 | 410 MPa | All positions | Rutile (TiO₂) | Most commonly used Indian general-purpose electrode | | E 4116 | 410 MPa | All positions | Basic (low-hydrogen) | Structural; pressure vessels; preferred for medium-strength steels | | E 4118 | 410 MPa | All positions | Basic (low-hydrogen) | Premium structural; thicker sections; nuclear quality | | E 7016 | 700 MPa | All positions | Basic | High-strength structural; weathering steels | | E 7018 | 700 MPa | All positions | Basic | Premium high-strength; nuclear; pressure vessels | | E 8018 | 800 MPa | All positions | Basic + iron powder | Premium structural for high-stress applications | | E 11018 | 1100 MPa | All positions | Basic | Ultra-high-strength for specialty applications |

Coating types and characteristics:

• Rutile (TiO₂)-based: easy arc striking, good slag detachment, smooth weld appearance. For mild steel + general fabrication. Higher hydrogen content (~ 15-30 mL/100g weld metal); not suitable for crack-sensitive welding.
• Cellulose-based: high arc forcing voltage; deep penetration; suitable for vertical-down + overhead positions. Used for pipe welding, sheet metal in difficult positions.
• Basic / low-hydrogen-based (limestone + fluorspar): very low hydrogen (< 5-10 mL/100g); essential for high-strength steels, thick sections, crack-prone joints. Requires proper drying + use protocols.
• Iron powder: added for higher deposition rates; speeds up welding
• Mixed coatings: combinations for specific properties (e.g., basic + iron powder = E 7018H, E 8018B etc.)

Position designations (Y in the code): - 0: Flat position only - 1: All positions - 2: Flat + horizontal positions - 3: Vertical-down position - 4: Special / specified positions

Chemical composition of deposited weld metal (Clause 5): - Carbon: typically 0.08-0.20% (low for ductility; higher for strength) - Manganese: 0.40-1.50% - Silicon: 0.30-0.80% - Phosphorus: ≤ 0.030% (lower for high-strength) - Sulphur: ≤ 0.030% - Other elements (Ni, Cr, Mo) per electrode type for alloy steels

Mechanical properties of deposited weld metal (Clause 6): - Tensile strength: per designation (e.g., E 4116 ≥ 410 MPa) - Yield strength: typically 0.85 × UTS - Elongation: ≥ 18-22% depending on type - Charpy V impact: typically ≥ 27 J at -20°C or -30°C for low-temperature service

Diffusible hydrogen content (Clause 7) — critical for crack-prone welding: - H₁₆ (basic): ≤ 16 mL/100g deposited weld metal (most basic electrodes) - H₁₀: ≤ 10 mL/100g (premium low-hydrogen) - H₅: ≤ 5 mL/100g (special low-hydrogen; nuclear / cryogenic applications) - Rutile electrodes typically have higher hydrogen (15-30 mL/100g); not suitable for high-strength / cold-weather welding

Coating moisture content (Clause 8): - Maximum 0.4% by mass of coating for normal-use - Maximum 0.10% for low-hydrogen electrodes (re-dried just before use) - Excessive moisture introduces hydrogen → cracking risk

Drying / baking specification: - New electrodes from sealed pack: ready to use - Opened electrodes: re-dry at 250-350°C for 1-2 hours before use - Holding ovens at 100-150°C maintain electrodes ready for welding - Critical for basic / low-hydrogen electrodes; less critical for rutile / cellulose

Visual + dimensional inspection: - Coating thickness uniform around the core wire - No coating cracks, chips, or moisture damage - Diameter tolerance: ± 0.10 mm typical - Length tolerance: ± 5 mm - Color coding: per manufacturer specification (some use coloured stamps; others use printed labels)

Selection by parent material: - Mild steel (IS 2062 E165, E250, E275): E 4113, E 4116 (most common) - Medium-strength structural steel (IS 2062 E350, E410): E 4116, E 4118, or E 6018 - High-strength steel (IS 8500 / weathering steel): E 7016, E 7018, E 8018 - Quenched and tempered (welded with care): E 8018, E 9018, E 11018; preheating required

Selection by application: - Light fabrication / repair: E 4113 (rutile, easy arc, good appearance) - General structural steel: E 4116 (basic; good crack resistance; standard quality) - Pressure vessels: E 4118 or E 7018 (low-hydrogen; tested mechanical properties) - Bridges / heavy structural: E 7018 or higher; nuclear-quality electrodes if specified - Pipe welding: E 4103 (cellulose; good penetration in vertical-down) or basic electrodes for premium - Low-temperature service (cryogenic): special low-hydrogen electrodes with Charpy testing at service temperature

Welder qualification (per IS 7307): - Welder must be qualified for the electrode + base metal combination - Procedure qualification record (PQR) documents tested combinations - Welder Performance Qualification (WPQ) tests individual welder ability - Periodic re-qualification typically every 6-12 months

Welding parameters: - Current: per electrode size + position (typical 50-200 A for 3.15-4.0 mm diameter electrodes) - Voltage: 20-30 V (depends on current + arc length) - Polarity: usually DCEN (electrode negative) or DCEP (electrode positive); some electrodes work on AC - Travel speed: 100-300 mm/min depending on parameters - Stringer or weave: stringer bead for thin sections; weave for thicker / fill passes

Joint preparation: - Bevel angles: typically 60-70° single-V, 45-50° double-V for thick sections - Root face: 1-3 mm for full-penetration - Root gap: typically 1.5-3 mm for backing rod-supported joints; 0-1.5 mm for fluxed backing - Cleanliness: free of mill scale, rust, oil, paint at weld zone

1. Wrong electrode for high-strength base material — using E 4116 on quenched-and-tempered steel: weld metal weaker than base; possible cold cracking. Match electrode tensile strength to base material (typically within 50 MPa).

2. Skipping electrode pre-drying — opened basic electrodes absorb moisture in humid conditions. Use without re-drying causes weld porosity + hydrogen-induced cracking. Always re-dry basic electrodes per manufacturer specification (250-350°C, 1-2 hours).

3. Storing electrodes in cold storage — sub-temperature storage causes condensation when removed; moisture in coating → hydrogen problems. Store at 25-35°C in dry conditions.

4. Using cellulose electrodes (E 4103) for crack-sensitive welding — high hydrogen content; not appropriate for high-strength + thick-section work. Limit to vertical-down pipe welding + non-critical applications.

5. No preheating + interpass temperature control — for thick sections (> 25 mm) or carbon-equivalent > 0.5%, preheat to 150-300°C; interpass temperature must remain in range. Skipping causes hardened HAZ + crack risk.

6. Inconsistent arc length — long arc → excess heat + atmospheric contamination → porosity. Short arc → spatter + inadequate fusion. Use diameter-correlated arc length (typically 1-1.5 × electrode diameter).

7. No post-weld heat treatment for crack-prone joints — high-restraint joints + low-temperature service often require PWHT (stress-relief at 600-650°C for 1 hour per inch thickness). Skipping causes residual-stress cracking in service.

8. Electrode reuse beyond limit — used + cooled stubs cannot be re-melted to make new electrodes. Discard stubs > 50 mm length; track consumption to ensure quality.

9. No welder qualification documentation — using unqualified welders for premium work compromises QC. Verify Welder Performance Qualification (WPQ) per IS 7307 before allowing welder on critical joints.

10. Inadequate cleaning of base metal — mill scale, rust, paint, moisture, oil at weld joint cause porosity + slag inclusions + lack of fusion. Mandatory cleaning to bright metal before welding (mechanical grinding + solvent cleaning + visual inspection).

• IS 7307 (Parts 1-3):1974/1989 — Approval testing of welding procedures + welders
• IS 5462:1985 — Equipment for arc welding
• IS 6419:1996 — Covered electrodes for welding alloy steels
• IS 2879:1975 — Welding electrodes for submerged arc welding (SAW)
• IS 4944:1968 — Welding electrodes for surfacing
• IS 11533:2007 — Welding consumables for high-strength steels
• IS 822:1970 — Code of procedure for inspection of welds
• IS 7363:1974 — Code of practice for hand-cleaning of weld joints
• IS 9595:1996 — Recommendations for metal arc welding of carbon and carbon-manganese steels
• IS 1182:1983 — Radiographic examination of fusion-welded joints (NDT)
• IS 4853:1982 — Radiography of butt-welded joints in pipes (NDT)
• IS 9706:1976 — Code of practice for ultrasonic testing of welds
• IS 800:2007 — General Construction in Steel (uses IS 814 electrodes for welded connections)
• IS 1608 Part 1:2005 — Tensile testing (used for weld metal property verification)
• AWS A5.1 / AWS A5.5 — US equivalent (mild steel + low-alloy electrodes)
• EN ISO 2560 — European equivalent for covered electrodes
• JIS Z 3211 — Japanese equivalent
• ASME Section IX — Welding procedure + welder qualification (US standard)

IS 814:2004 is the current revision (consolidating earlier Part 1 + Part 2 and replacing IS 814:1980), well-aligned with international practice. The 2004 revision: - Modernized the classification system to align with AWS A5.1 + ISO 2560 - Added explicit hydrogen content classifications (H5, H10, H16) - Tightened acceptance test methods - Added storage + handling requirements

Indian welding consumables market: - Major manufacturers (D&H Sécheron, Modi Hitech, Lincoln Electric India, ESAB India, ADOR Welding, Anand Arc): consistent IS 814 conformance, full range of electrode types, multiple certifications (IS, ASME, AWS, EN). Premium pricing; quality assurance via lab testing per batch. - Mid-tier manufacturers: variable. Pre-qualify with sample testing. - Imported electrodes (Chinese, Korean — competitive pricing): widely available; verify IS 814 equivalence + manufacturer's certification.

Cost reality (2026 typical Indian market): - E 4113 electrode 3.15 mm × 350 mm: ₹120-200 per kg (with 5 kg pack typical) - E 4116 (basic): ₹200-300 per kg - E 7018 (premium basic): ₹350-500 per kg - E 8018 / E 11018 (high-strength): ₹500-1,200 per kg - Imported premium: ~30-50% premium over Indian equivalent

For structural / pressure vessel projects: - Always specify electrode type + classification per IS 814 + manufacturer - Mandate batch-level Material Test Certificate (MTC) - Welder qualification per IS 7307; documentation maintained - Welding procedure specification (WPS) prepared and qualified before production welding - NDT (RT / UT / MT / DPT) per applicable code on critical welds

Quality assurance protocols: - Electrode storage: dry, controlled-temperature; sealed pack until use - Re-drying ovens: 250-350°C; basic electrodes need re-drying after exposure - Holding ovens: 100-150°C for electrodes ready for use - Welder qualification + periodic re-test - Welding procedure approved + recorded - Documentation: heat number, electrode batch, welder ID, position, parameters for every critical weld

Cost-effectiveness of premium quality: Using premium IS 814:2004 electrodes vs unbranded saves on: - Defect rate: 5-15% reduction - Re-work cost: substantial (failed weld + repair labour) - Liability: structural failure cost vs electrode cost is 1000:1 ratio - Inspection cost: less defects → less NDT volume needed

For any structural / pressure-vessel / safety-critical work, premium electrode quality is essential. The electrode cost is < 1% of total project cost; the consequences of using poor-quality electrodes are catastrophic.

Future direction: - High-deposition electrodes (E 8018-H4 with iron powder) for productivity improvement - Specialty alloyed electrodes for super-duplex stainless, Inconel, high-temperature alloy welding - Automated SMAW + flux-cored processes; gradually replacing manual SMAW for production welding - Welder qualification simulation training; more efficient certification process

IS 814 remains the working specification for SMAW electrodes in India; the market is mature; quality is reliable from premium manufacturers; standardization is well-implemented across structural / industrial / pipeline welding sectors.