AWS Class ENi-1 Welding Electrodes
AWS A5.11 ENi-1 Welding Electrode Supplier & Stockist in Mumbai
Nicorex Alloys is a dedicated ISO 9001 and ISO 14001 certified supplier and importer of ENi-1 pure nickel coated electrodes in Mumbai, India. We provide these ENi-1 welding electrodes classified under AWS A5.11 ENi-1 (ASME SFA 5.11, UNS W82141). We also maintain stock across all standard diameters.
ENi-1 is a pure nickel SMAW consumable classified under AWS A5.11 / ASME SFA-5.11 (UNS W82141). The weld deposit contains 97%+ nickel with controlled titanium additions that act as deoxidisers and carbon scavengers, preventing porosity and graphitisation in the weld pool. This chemistry delivers crack-free, ductile, and machinable weld metal with outstanding resistance to hot concentrated caustic alkalis — a level of corrosion resistance that no stainless steel or standard nickel alloy electrode can match. Typical all-weld-metal mechanical properties reach a tensile strength of 448 MPa (65 ksi), yield strength of 400 MPa (58 ksi), and 25% elongation. The basic-coated electrode operates on DCEP polarity and is suitable for all welding positions, including flat, vertical, overhead, and horizontal. ENi-1 is the specified matching filler for welding commercially pure nickel base metals such as Nickel 200 (UNS N02200) and Nickel 201 (UNS N02201), as well as the nickel-clad side of nickel-clad steel.
Available diameters include 2.5 mm, 3.15 mm (1/8″), 4.0 mm (5/32″), and 5.0 mm (3/16″). Primary base metals are Nickel 200 (UNS N02200), Nickel 201 (UNS N02201), and nickel-clad steel. Important industries include chemical processing (caustic soda), pulp and paper, marine, and food processing. Every batch ships with ISO 9001 and ISO 14001 certification, plus MTC 3.1 per EN 10204.
ENi-1 Electrode Specifications & Compliance Standards
The following specifications and standards govern ENi-1 welding electrodes for shielded metal arc welding of commercially pure nickel and nickel-clad steel.
| AWS | A5.11 ENi-1 |
|---|---|
| ASME SFA | 5.11 ENi-1 |
| UNS Number | W82141 |
| Base Metal ASME P-Number | P-41 (Nickel 200/201, UNS N02200/N02201) |
| Welding Process | SMAW (Shielded Metal Arc Welding) |
| Polarity | DCEP (DC Electrode Positive) |
| Coating Type | Basic (Lime) |
| Welding Positions | All positions (F, V, OH, H) |
| Available Diameters | 2.5 mm, 3.15 mm (1/8″), 4.0 mm (5/32″), 5.0 mm (3/16″) |
| Electrode Length | 350 mm (14″) standard |
Weld Deposit Chemical Composition of ENi-1 (%)
The chemical composition of the ENi-1 weld deposit is controlled to produce nearly pure nickel weld metal with titanium deoxidation for carbon scavenging and porosity prevention.
| Element | Carbon (C) | Nickel (Ni) | Titanium (Ti) | Manganese (Mn) | Iron (Fe) | Silicon (Si) | Aluminium (Al) | Copper (Cu) | Phosphorus (P) | Sulfur (S) | Other |
|---|---|---|---|---|---|---|---|---|---|---|---|
| AWS A5.11 Range | 0.10 max | 92.0 min | 1.0–4.0 | 0.75 max | 0.75 max | 1.25 max | 1.0 max | 0.25 max | 0.03 max | 0.02 max | 0.50 max |
| Typical Value | 0.04 | 97.6 | 1.05 | 0.45 | 0.35 | 0.50 | — | — | 0.01 | 0.004 | — |
The controlled titanium addition (1.0–4.0%) defines ENi-1 metallurgy. Titanium reacts with carbon in the molten weld metal to form stable titanium carbides (TiC), preventing free carbon from precipitating as graphite at grain boundaries. Without this carbon scavenging, graphitisation causes severe embrittlement and intergranular cracking in pure nickel welds. The 97%+ Ni content gives the deposit outstanding resistance to hot concentrated caustic alkalis (NaOH, KOH).
All-Weld-Metal Mechanical Properties of ENi-1
Mechanical properties of the ENi-1 weld deposit, tested as per AWS A5.11, are presented below.
| Property | Tensile Strength | Yield Strength (0.2% offset) | Elongation (% in 4d) | Charpy V-Notch Impact | Hardness |
|---|---|---|---|---|---|
| AWS A5.11 Minimum | 60,000 psi (415 MPa) | Not specified | 20% | Not required | Not specified |
| Typical (WeldWire) | 65,000 psi (448 MPa) | 58,000 psi (400 MPa) | 25% | Not applicable | ~120–150 HB |
Pure nickel weld deposits from ENi-1 are soft and ductile. The 97%+ Ni produces a single-phase FCC austenitic microstructure with no hardening phases. ENi-1 deposits are readily machinable, which is critical for overlay cladding where the welded surface must be machined to final dimensions.
Base Metal Compatibility & P-Number Matrix for ENi-1
ENi-1 electrodes are qualified to join the following base metals. The primary application is welding commercially pure nickel (ASME P-41) to itself and to dissimilar metals.
| Base Metal | UNS | ASME P-Number | Joint Type |
|---|---|---|---|
| Nickel 200 (wrought) | N02200 | P-41 | Similar (P-41 to P-41) |
| Nickel 201 (low carbon) | N02201 | P-41 | Similar |
| Nickel-clad steel (clad side) | N02200 over P-1 | P-41 overlay | Cladding restoration |
| Carbon steel (dissimilar) | Various | P-1 | Dissimilar — overlay/buttering |
| Low-alloy steel (dissimilar) | Various | P-3, P-4 | Dissimilar |
| 300-series stainless (dissimilar) | Various | P-8 | Dissimilar — transition joint |
The nearly pure nickel deposit accommodates dilution from iron-base metals without forming brittle intermetallic phases. For nickel-clad steel, ENi-1 welds the clad side while carbon steel electrodes (E7018) weld the backing steel. Do not use E7018 on the nickel-clad layer; iron dilution destroys corrosion resistance.
Welding Parameters & Procedure Guidance for ENi-1
Controlled heat input and stringer bead technique are mandatory when welding with ENi-1 to prevent porosity and hot cracking in the pure nickel weld deposit.
| Diameter | Amperage (Flat) | Amperage (V & OH) | Voltage |
|---|---|---|---|
| 2.5 mm (3/32″) | 65–85 A | 60–75 A | 24–28 V |
| 3.15 mm (1/8″) | 85–125 A | 80–90 A | 26–30 V |
| 4.0 mm (5/32″) | 125–170 A | 100–120 A | 28–32 V |
| 5.0 mm (3/16″) | 170–225 A | 110–140 A | 28–32 V |
Polarity is DCEP only. No preheat is needed for Nickel 200/201; for dissimilar joints to carbon steel, preheat the steel side to 10–40°C above the dew point. Maximum interpass temperature is 150°C (300°F). Target heat input at 1.0–2.0 kJ/mm. Use stringer beads only with no weave wider than 3× electrode diameter. Keep a short arc length with a slight drag angle (5–10°). Clean each bead thoroughly; nickel weld slag is tenacious and must be fully removed.
Sulfur contamination is the single greatest risk to ENi-1 weld integrity. Trace sulfur from cutting fluids, marking paints, or grease causes catastrophic hot cracking. Use mechanical cleaning with nickel-dedicated stainless steel tools only. Post-weld heat treatment is generally not required. Do not stress-relieve Nickel 200 above 315°C (600°F) due to graphitisation risk.
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Critical-Service Welding Applications of ENi-1 Electrode
ENi-1 serves industries where pure nickel base metals handle aggressive caustic, sulfide, and organic acid environments. Five major application areas rely on this welding rod for fabrication and repair.
- Primary SMAW consumable for evaporator bodies, concentrator vessels, and transfer piping in chlor-alkali plants.
- Pulp mills select ENi-1 for digester vessels, recovery boiler components, and smelt spout linings exposed to hot caustic solutions with sulfide contamination.
- Reactor vessels and transfer piping handling fatty acids, vinyl chloride monomer (VCM), and sodium metal silicate.
- ENi-1 welds the nickel-clad layer of nickel-clad steel plate and deposits corrosion-resistant overlay on carbon steel substrates. Minimum two-layer deposition is recommended to achieve full corrosion resistance with acceptable dilution.
- ENi-1 welds vessels, jacketed reactors, and CIP piping for food and pharmaceutical equipment requiring freedom from metallic contamination. In marine service, the soft, machinable deposit allows post-weld finishing to sanitary surface standards required for caustic cleaning systems.
Storage, Handling & Re-Drying of ENi-1 Electrodes
Store ENi-1 in original sealed packaging under clean, dry conditions at least 5°C above the dew point with relative humidity below 50%. Nicorex Alloys supplies ENi-1 in hermetically sealed canisters, so no re-drying is needed for first use if the packaging is intact.
For moisture-exposed electrodes, re-dry at 300–350°C (570–660°F) for 60 minutes. After opening, hold at 100–150°C (212–300°F). Maximum exposure outside the oven is 4 hours. Re-dry a maximum of 3 times. Handle with clean, lint-free gloves using nickel-dedicated tools only. Carbon steel contamination, sulfur, lead, and zinc are catastrophic for pure nickel welds.
How to Order ENi-1 Welding Electrode from Nicorex Alloys
To request a quotation of ENi-1 welding electrode from Nicorex Alloys, provide the following details:
- Electrode Type - SMAW Covered Electrode / Stick (ENi-1)
- Size - 2.5mm / 3.2mm / 4.0mm x 350mm
- Current Type - DCEP or AC — specify amperage per diameter
- Welding Position - All Positions (1G–6G)
- Material Grade - Commercially Pure Nickel / UNS W82141 / AWS A5.11: ENi-1 / W.Nr. 2.4066
- Quantity - Pieces or cartons (1 kg / 5 kg / 10 kg / 20 kg)
- Standard - AWS A5.11 / ASME SFA 5.11, EN ISO 14172, ASME Section IX
- Additional Requirements - Min 92% Ni, preheat 150–300°C, PMI, heat / lot traceability
- Documentation - MTC 3.1/3.2, PMI Report, Weld Metal Composition Report, TPI Certificate
- Delivery - Domestic / International (specify destination)
Note that ENi-1 (AWS A5.11) is for commercially pure nickel; do not confuse it with ENi-CI (AWS A5.15) for cast iron. Matching ERNi-1 TIG/MIG wire is available for combined SMAW/GTAW procedures. Delivery across India from our Mumbai warehouse.
Frequently Asked Questions
What is the Role of Titanium (1.0–4.0%) in ENi-1 Weld Deposits?
Titanium acts as a carbon scavenger. It reacts with carbon in the weld pool to form stable titanium carbides (TiC) instead of allowing free carbon to precipitate as graphite at grain boundaries. This prevents graphitisation.
What is the Difference Between ENi-1 (AWS A5.11) and ENi-CI (AWS A5.15)?
ENi-1 (AWS A5.11) welds commercially pure nickel base metals (Nickel 200, 201, nickel-clad steel) and carries a basic coating for corrosion-critical service. ENi-CI (AWS A5.15) is designed for cast iron repair with a graphite-type reducing coating.
Why is Sulfur Contamination Catastrophic for ENi-1 Welds?
Even parts-per-million sulfur levels form low-melting-point nickel-sulfide (Ni₃S₂) films at grain boundaries. These films melt at roughly 645°C, well below the weld metal solidification temperature, causing catastrophic hot cracking.
When should Nickel 201 be Used Instead of Nickel 200 as the Base Metal with ENi-1?
Nickel 200 allows up to 0.15% carbon; Nickel 201 limits carbon to 0.02% max. For service above 315°C (600°F), Nickel 201 must be used because elevated temperatures cause carbon in Nickel 200 to precipitate as graphite at grain boundaries.
What is the Price of ENi-1 Welding Electrode per kg in India?
ENi-1 pricing depends on diameter, order quantity, packaging, and approvals. Contact Nicorex Alloys for current ex-stock pricing and bulk discounts from Mumbai.
When should you not use ENi-1 Welding Electrodes?
Do not use ENi-1 for nickel alloys containing chromium, molybdenum, or copper. Avoid ENi-1 in oxidising acid environments.