Lincoln Electric UltraCore® HD-C is Lincoln's premium high-deposition gas-shielded flux-cored wire (FCAW-G) classified AWS A5.36 E71T1-C1A2-CS1, engineered to deliver superior arc performance, easy slag removal, and high impact toughness for demanding structural and heavy fabrication applications. This listing is the 0.045" diameter, 33 lb spool (ED033755) — the versatile production format combining all-position capability with the precision of the newer A5.36 classification standard.
| Product Line | Lincoln Electric UltraCore® HD-C |
|---|---|
| Part Number | ED033755 |
| AWS Classification | AWS A5.36 E71T1-C1A2-CS1 |
| Wire Diameter | 0.045 in (1.14 mm) |
| Spool / Drum Weight | 33 lb Spool |
| Shielding Gas Required | 100% CO₂ (C1 classified) — also performs with 75% Ar / 25% CO₂ (C25) |
| Polarity | DCEP (DC Electrode Positive) |
| Typical Applications | Structural steel (AWS D1.1), bridge fabrication, pressure vessels, heavy plate fillet and groove welds in all positions, applications requiring -20°F CVN impact toughness certification |
UltraCore HD-C represents the current generation of Lincoln Electric's flux-cored wire technology. The "HD" designation reflects its high-deposition formulation, and the "C" indicates its classification for use with 100% CO₂ shielding gas. The AWS A5.36 classification with "A2" impact subclass means the wire deposit is tested for CVN toughness at -20°F — an important requirement for cold-weather structural, bridge, and pressure vessel applications.
- AWS D1.1 structural fabrication: Designed for fillet and groove welds on mild and low-alloy steel base metals including A36, A572 Gr. 50, A992, and A913. All-position capability (E71) covers vertical-up, overhead, and flat/horizontal welds.
- Bridge construction: The A5.36 classification with explicit CVN impact certification is increasingly required on bridge fabrication by DOT and AASHTO specifications. HD-C's -20°F impact rating qualifies it for most bridge code requirements.
- Pressure vessels and process equipment: ASME Section VIII applications where filler metal CVN toughness at low temperature is specified benefit from the verifiable A5.36 impact test documentation HD-C provides.
- High-deposition production welding: The HD formulation is optimized for higher deposition rates than standard T-1 wires at equivalent amperages, improving throughput on heavy plate production without sacrificing weld quality.
- Cold-weather and outdoor construction: CVN toughness certification to -20°F makes HD-C appropriate for structures that will see low service temperatures — bridges, arctic-adjacent infrastructure, and cold storage buildings.
Choose UltraCore HD-C when your application or specification explicitly requires AWS A5.36 classification, when -20°F CVN impact toughness documentation is needed, or when you want Lincoln's latest-generation flux-cored wire technology with the clearest specification traceability.
Compare UltraCore HD-C to Outershield 71M (AWS A5.20 E71T-1C/-1M): both are all-position FCAW-G T-1 wires for mild steel, but Outershield carries the older A5.20 designation while HD-C carries the more detailed A5.36 classification. For code work that specifically references A5.36, HD-C is the correct choice. For general structural work where A5.20 is acceptable, Outershield 71M is cost-competitive.
If you need the 0.052" diameter for maximum deposition rate, see UltraCore 71C M2 (ED031819). For slag-free production welding in flat/horizontal, see Metalshield MC-110. Browse all options at our Flux-Core Welding Wire collection.
WeldingMart is an authorized Lincoln Electric distributor. For applications requiring AWS A5.36 CVN-certified weld wire — bridges, pressure vessels, cold-service structures — product authenticity and traceability are not optional.
- Genuine Lincoln Electric product: Every spool includes full lot traceability to Lincoln Electric's quality records. Your WPS documentation requires it; we provide it.
- Structural welding expertise: Our team understands A5.36 classification requirements, shielding gas qualification, and D1.1 code compliance and can assist with your application.
- Fast US shipping: In-stock spools ship promptly to minimize disruption to your fabrication schedule.
- Complete flux-cored selection: Compare UltraCore HD-C to Outershield 71M, UltraCore 71C M2, and other options at our Flux-Core Wire collection.