HAYNES® 188 Welding Wire

HAYNES® 188 Welding Wire Supplier in Mumbai, India

Name: HAYNES® 188 Welding Wire
Brand: Nicorex Alloys

Nicorex Alloys is an ISO 9001 and ISO 14001 certified supplier, stockist, and trader of HAYNES® 188 welding wire based in Mumbai, India. We supply these welding wires manufactured according to the AMS 5801 standard.

HAYNES 188 filler metal (AMS 5801, UNS R30188) is a cobalt-nickel-chromium-tungsten wire with a nominal balance of Co 39%, Ni 22%, Cr 22%, W 14% and La 0.03-0.12%. The lanthanum addition produces a tenacious chromia scale that resists spallation during cyclic thermal exposure and improves oxidation resistance. HAYNES 188 welding wire produces a cobalt-based weld that stays strong at high temperatures, resists oxidation, remains stable under heat and still stays ductile at room temperature. Haynes 188 welding wires are available as TIG rods (1.6-4.0 mm × 914 mm) and MIG spools (0.76-2.4 mm). The wire is used for GTAW and GMAW of HAYNES 188 base metal in sections up to 9.5 mm. HAYNES 188 welding wire offers high‑temperature strength, excellent resistance to sulfidation and hot corrosion, and a stable protective oxide layer, giving longer component life, fewer failures, and reliable performance in demanding gas turbine and power applications.

HAYNES 188 welding wire is mainly used in military and commercial aircraft gas turbines, land-based power plants, and nuclear reactor projects. Nicorex Alloys supplies this wire with EN 10204/3.1 mill test certificates for every order

Alloy 188 Welding Wire Specifications

The HAYNES 188 welding wire specifications are listed below, including standards, designations, processes, wire sizes, shielding gas, and other important specifications:

Applicable Specification	AMS 5801
UNS Designation	R30188
Welding Processes	GTAW (DCEN), GMAW (DCEP)
SAW	Not recommended
Shielding Gas	100% Argon (Ar); Ar/He for GMAW
TIG Rod Sizes	1.6, 2.4, 3.2, 4.0 mm × 914 mm (0.063–0.156 in.)
MIG Wire Sizes	0.76, 0.9, 1.1, 1.2, 1.6, 2.4 mm (0.030–0.094 in.)

Chemical Composition of HAYNES 188 Weld Deposit (%)

Lanthanum is a key alloying element in the HAYNES 188 system. The weld deposit chemistry per AMS 5801 is given below.

Element	Cobalt (Co)	Chromium (Cr)	Nickel (Ni)	Tungsten (W)	Iron (Fe)	Manganese (Mn)	Silicon (Si)	Carbon (C)	Lanthanum (La)	Phosphorus (P)	Sulfur (S)	Boron (B)
Specification (wt%)	Remainder (~39)	20.0-24.0	20.0-24.0	13.0-16.0	3.0 max	1.25 max	0.20-0.50	0.05-0.15	0.02-0.12	0.02 max	0.015 max	0.015 max

Lanthanum, added at 0.02-0.12%, is the key feature that distinguishes HAYNES 188. It forms lanthanum oxide particles that lock the protective chromia layer onto the alloy surface and stop it from flaking off during repeated heating and cooling. This gives HAYNES 188 much better cyclic oxidation resistance than HAYNES 25 and performance comparable to nickel-base alloys like HAYNES 230.

All-Weld-Metal Mechanical Properties of HAYNES 188

Typical all-weld-metal properties of HAYNES 188 welding wire deposited by GTAW are listed as follows.

Property	Tensile Strength	Yield Strength (0.2%)	Elongation
Typical Value	896-965 MPa (130-140 ksi)	448-483 MPa (65-70 ksi)	40-45%

HAYNES 188 has an FCC crystal structure and does not become brittle at low temperatures. It stays very ductile even at cryogenic temperatures, but it is mainly used in high‑temperature gas turbine parts.

Base Metal Compatibility for HAYNES 188 Filler Metal

HAYNES 188 filler is the matching choice for thin-section joints. For thicker joints or dissimilar metals, use other recommended fillers. The tables below show which fillers to use for matching and dissimilar joints.

Base Metal	UNS	Applications
HAYNES 188	R30188	Primary matching filler for sections ≤9.5 mm (3/8 in.)
HAYNES 25 / L-605	R30605	Cross-welding cobalt alloy combustor assemblies

Dissimilar and thick-section joints:

Joint Configuration	Recommended Filler	Reason
HAYNES 188 thick section (>9.5 mm)	HAYNES 230-W (ERNiCrWMo-1)	Better hot cracking resistance in thick cobalt welds
HAYNES 188 to nickel alloys	230-W, 556, HASTELLOY S or W	Nickel-base transition compatibility
HAYNES 188 to iron-base alloys	556 or HASTELLOY S	Multi-alloy metallurgical compatibility

Recommended Welding Parameters for HAYNES 188 Filler Wire

Recommended welding parameters for Haynes 188 filler wire are outlined below, including suitable processes, polarity, shielding gases and key heat-control guidelines.

Welding Process	Polarity	Shielding / Consumables	Key Technical Requirements
GTAW (TIG)	DCEN	100% Argon (Shielding & Back-purge)	Use stringer beads only; Interpass temp ≤ 93°C (200°F).
GMAW (MIG)	DCEP	Argon or Argon-Helium	Supports Short-arc or Spray transfer modes.
SMAW (Stick)	DCEP	HAYNES 25 electrodes (AMS 5797)	No dedicated 188 electrode exists; use Alloy 25 as a substitute.
SAW (Sub-Arc)	N/A	Not Recommended	High heat/slow cooling causes cracking in cobalt-base deposits.

Preheat is not required, provided the base metal is above 0°C (32°F). Post-weld heat treatment is not normally needed. If a full solution anneal is required, hold at 1163–1191°C (2125–2175°F) followed by a rapid cool. Clean all joint surfaces before welding. Remove grease, oil, crayon marks, and sulfur compounds. Avoid contact with copper or copper-bearing materials in the joint area.

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Industrial Applications of HAYNES 188 Filler Metal

HAYNES 188 welds protect gas-path parts in military and commercial aircraft, power plants and nuclear systems, allowing components to withstand long-term exposure to very high, oxidising exhaust temperatures.

Military Gas Turbine Engines: Fighter jet and helicopter engines use HAYNES 188 filler in combustion cans, liners, ducts, and afterburner parts.
Commercial Aviation Gas Turbines: Commercial aircraft engines rely on HAYNES 188 welds in combustors and other hot components. Its lanthanum-enriched oxide layer remains firmly in place through repeated takeoff and landing heat cycles, shielding the metal surface.
Land-Based Power Generation: In industrial gas turbines, this alloy is used in combustor liners and related parts, which last longer and reduce maintenance downtime for base-load and peaking-duty turbines.
Nuclear: In high-temperature gas-cooled reactors and Generation IV designs, HAYNES 188 is used for core parts that must resist radiation and stay strong at high temperatures for long periods.

Storage and Handling of HAYNES 188 Welding Wire

HAYNES 188 is supplied as bare wire, so re-baking is not applicable. Store in original sealed packaging at 15-25°C and below 60% relative humidity. Shelf life is indefinite while the packaging remains sealed and undamaged.

Before welding, clean all base metal surfaces for 25 mm (1 in.) on each side of the joint. First, wipe with acetone or isopropyl alcohol to remove oils and contaminants. Then, mechanically clean the area using a stainless steel or carbide brush. Do not use carbon steel tools, shop rags or recycled solvents on cobalt alloy weld joints.

Keep the following five contaminants, like sulfur, lead, zinc, copper and low-melting-point metals (tin, bismuth, antimony) out of all cobalt alloy weld areas. Even tiny amounts can cause hot cracking and severe weld failure. Do not change the RTW™ surface finish on spooled wire.

Available Forms and Packaging of HAYNES 188 Welding Wire

HAYNES 188 welding wire is stocked in the following forms and packaging to suit aerospace and industrial fabrication requirements.

Form	Size Range	Packaging
TIG Rods	1.6, 2.4, 3.2, 4.0 mm × 914 mm	Sealed tubes
MIG Wire (Spools)	0.76, 0.9, 1.1, 1.2, 1.6, 2.4 mm	Sealed spools/reels
Coils / Reels	Per customer requirement	Sealed coil packaging

How to Order HAYNES 188 Welding Wire from Nicorex Alloys

To order HAYNES 188 welding wire, provide Nicorex Alloys with the following 10 details:

Form — TIG rod or MIG spool/reel
Diameter — TIG rods: 1.6, 2.4, 3.2, 4.0 mm / MIG wire: 0.76, 0.9, 1.1, 1.2, 1.6, 2.4 mm
Quantity — kg or number of tubes/spools
Heat/Lot Traceability — Single heat lot or mixed heats acceptable
Testing and Certification — MTC 3.1 per EN 10204 (standard)
Additional Certifications — Chemical re-verification, mechanical testing, or OEM-specific reports
Packaging — Standard sealed tubes (TIG) or sealed spools (MIG)
Delivery Destination — Domestic / international export

Frequently Asked Questions

What is the difference between HAYNES 188 and HAYNES 25 for combustor welding?

HAYNES 188 has three key advantages over HAYNES 25. It resists oxidation to 1095°C instead of 980°C, due to lanthanum. It avoids the Laves phase embrittlement that reduces ductility in HAYNES 25 at 600-800°C. It’s higher nickel (22% vs 10%) also improves ductility.

Is HAYNES 188 welding wire suitable for SMAW (Stick) welding?

Yes. For SMAW on 188, use HAYNES 25 electrodes (AMS 5797). For critical welds, use GTAW with matching HAYNES 188 wire to achieve the best joint quality.

Does HAYNES 188 welding wire carry an AWS classification?

No. HAYNES 188 is a cobalt-based superalloy that is not listed in any AWS A5.x filler metal standard. It is covered only by AMS 5801.

What is the maximum continuous service temperature for HAYNES 188 weld deposits?

HAYNES 188 weld deposits can run continuously in oxidising conditions up to 1095°C (2000°F) and withstand even higher temperatures for short periods. A lanthanum-stabilised oxide layer stays intact through thousands of heating and cooling cycles in gas turbine engines.

When not to use HAYNES 188 welding wire

HAYNES 188 should not be used in aqueous (water-based) corrosion environments or for welds thicker than 9.5 mm (3/8 in). Avoid submerged arc welding (SAW), as its high heat input can cause cracking in cobalt weld deposits.