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Nov 4, 2021

Versatile Gas-Shielded Flux-Cored Wires Offer Robust Mechanical Properties

By: Hobart Brothers

TROY, Ohio. November 3, 2021 — Hobart has introduced a new gas-shielded flux-cored wire — FabCO® 91K2-M — to accompany its reformulated FabCO 91K2-C wire. Both wires provide robust mechanical properties when welding within a wide range of heat inputs. They are ideal for single or multi-pass, all-position welding on offshore, shipbuilding, heavy equipment and structural fabrication applications.

“These new wires provide operators with the versatility to work within a wider range of welding parameters without sacrificing quality or mechanical properties,” says Derick Railling, product manager, Critical Welds, Hobart. “They also offer excellent impact toughness to reduce the risk of cracking in critical applications.”

The FabCO 91K2-C wire is classified to American Welding Society (AWS) A5.29 Specification for Low-Alloy Steel Electrodes for Flux-Cored Arc Welding as an E91T1-K2C J H4 wire for use with 100% CO2 shielding gas. The FabCO 91K2-M wire is classified to the same specification as an E91T1-K2M J H4 wire for use with 75 to 80% argon/balance CO2 shielding gas mixtures.

Both wires feature an H4 designation, indicating they produce a weld deposit with a very low diffusible hydrogen content, which is desirable when welding higher-strength steels. Both wires also feature a “J” designation that indicates enhanced low temperature toughness requirements. However, FabCO 91K2-C and FabCO 91K2M have been developed to exceed classification requirements for test temperature and absorbed energy; users can typically expect good toughness at temperatures as low as -76° F.

The two wires offer a fast-freezing slag that helps produce flat weld contours, even when welding out of position, and they have low spatter levels to reduce post-weld cleanup. Easy slag removal minimizes the opportunity for inclusions in multi-pass welds, along with the associated downtime and cost for rework. A stable arc transfer results in smooth weld beads with uniform fusion.

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