Flux-Core Welding
Semi-automatic welding process using a tubular wire filled with flux. Available in self-shielded (no gas required) and gas-shielded variants. Combines the portability of SMAW with the speed of GMAW. Commonly used in structural steel, shipbuilding, and outdoor fabrication.
Flux-core welding feeds a tubular wire filled with flux compounds. Self-shielded varieties (like E71T-11) need no gas bottle, which makes them practical for outdoor and field work. Gas-shielded varieties (like E71T-1) use CO2 or mixed gas and produce higher-quality welds at faster speeds than solid MIG wire. Flux-core is the go-to process when you need MIG-like productivity but cannot control the environment. The trade-off is more spatter and a slag layer that needs removal.
Flux-Core Welding Electrodes
E71T-11
Flux-core wire that needs no gas. Best for outdoor welding, farm repairs, and field work.
E71T-GS
Single-pass flux-core wire for thin steel and home projects. The small spool you find at hardware stores.
E71T-1
Gas-shielded flux-core for production welding. Higher deposition than solid MIG wire with better out-of-position performance.
E71T-8
Self-shielded flux-core wire with seismic demand classification. Approved for AWS D1.8 welding in seismic zones.
E81T1-Ni1
Gas-shielded nickel flux-core wire rated for -40F impact toughness. For low-temperature structural and pressure vessel work.
Flux-Core Wire Questions
What is the difference between gas-shielded and self-shielded flux-core?
Gas-shielded flux-core (E71T-1) requires external shielding gas and gives higher deposition rates and better mechanical properties. Self-shielded flux-core (E71T-11, E71T-GS) needs no gas, making it practical for outdoor and field welding.
Can you use flux-core wire without gas?
Only self-shielded types like E71T-11 and E71T-GS. Gas-shielded types like E71T-1 require shielding gas. Check the wire classification before welding without gas.