S222108-015 - Hobart Fabshield 21B Self-Shielded Flux-Cored Wire .035 500lb Reel

Technical Overview: Hobart Fabshield 21B .035" Flux-Cored Wire

The Hobart Fabshield 21B is a general-purpose, self-shielded flux-cored wire (FCAW-S) designed for the high-speed welding of mild and coated steels. This product is supplied in a 500 lb reel, catering specifically to industrial users requiring extended run times and high deposition efficiency. Classified under AWS A5.20 as E71T-11, this wire is formulated to operate on DCEN (Direct Current Electrode Negative) polarity, providing a soft arc and deep penetration characteristics suitable for a wide range of material thicknesses.

Metallurgically, Fabshield 21B is distinct due to its robust deoxidizing system. It is capable of welding over galvanized surfaces and mild rust without compromising the integrity of the weld deposit. The flux core generates a protective slag system that shields the molten pool from atmospheric contamination, eliminating the need for an external gas source like CO2 or Argon/CO2 mixes. This makes it an excellent choice for applications where gas coverage is difficult to maintain, such as outdoor structural erection or repair of agricultural equipment.

Mechanical Properties and Welding Characteristics

The wire offers impressive mechanical properties, typically delivering tensile strengths in the range of 88,000 psi (607 MPa) and yield strengths around 66,000 psi (455 MPa), with elongation values of approximately 24%. These properties ensure ductile and sound welds that meet the rigorous demands of general fabrication. The .035" diameter allows for precise control on thinner gauge materials while still providing enough deposition for thicker plate welding in multi-pass procedures.

Operational Efficiency

The 500 lb reel packaging is designed for use with heavy-duty wire feeders and payoff packs often found in automation or stationary welding stations. This bulk format drastically reduces the frequency of spool changes compared to standard 33 lb or 10 lb spools, directly translating to higher arc-on time. The wire features a fast-freezing slag that supports all-position welding, including vertical-up and overhead, making it highly adaptable to complex joint configurations.

Applications and Suitability

Fabshield 21B is widely specified for the fabrication of structural shapes, barge and ship construction, general equipment repair, and the manufacturing of tanks and hoppers. Its ability to perform single and multiple pass welds on steel with moderate surface contaminants makes it a forgiving and reliable consumable for diverse industrial challenges.