What shielding gas or flux type does the Lincoln UltraCore 91K2M-H Plus Flux-Cored FCAW-G Welding Wire require?

The Lincoln UltraCore 91K2M-H Plus Flux-Cored FCAW-G Welding Wire is a flux-cored wire. Flux-core wire comes in two types: FCAW-G (gas-shielded, dual-shield) requires external shielding gas (typically 75% Ar/25% CO2 or 100% CO2) for full protection; FCAW-S (self-shielded, innershield) generates its own shielding from the flux core and requires no external gas. The AWS classification E91T1-K2M-JH4 indicates gas-shielded operation.

What is the deposit strength of the Lincoln UltraCore 91K2M-H Plus Flux-Cored FCAW-G Welding Wire?

For E91T1-K2M-JH4: Deposit tensile strength for mild steel solid MIG wire (ER70S-x) is approximately 70,000 PSI (483 MPa) minimum. For stainless filler metals, the deposit strength matches the base alloy grade. For flux-core wires, strength and chemistry vary by classification — refer to the AWS classification on the package for the exact mechanical property requirements.

Call to Talk With A Product Expert - 877-532-WELD (9353)

1 2

Lincoln UltraCore 91K2M-H Plus Flux-Cored FCAW-G Welding Wire

Q: How should I store the Lincoln UltraCore 91K2M-H Plus Flux-Cored FCAW-G Welding Wire to prevent weld quality issues?

Store MIG wire in a clean, dry location away from humidity. Moisture absorption causes porosity in the weld — mild steel wire is particularly susceptible. If wire has been exposed to moisture, it may show surface rust; lightly rusted wire can sometimes be used but should be wiped before feeding. Flux-core and low-hydrogen electrodes require stricter moisture control than solid wire. Keep spools in their original packaging or sealed containers with desiccant packets when not in use.

SKU: ED035379

$227.70 ~~$279.18~~

Package Size

Lincoln Elite Dealer

Free Shipping over $250

Lowest Price

Visit our support center

Expert help & advice
Check your order status

Updates & Tracking
Returns & exchanges

All you need to know
Why WeldingMart.com

Our Promise To You