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Hobart Brothers has introduced two metal-cored electrodes designed for submerged arc welding on chrome-moly steel that are suitable for power generation applications.

The Tri-Mark Metalloy B2-S and Metalloy B3-S low-alloy submerged arc electrodes provide weld deposits that withstand elevated service temperatures and improve productivity compared with welding with solid electrodes.

Both products meet American Welding Society (AWS) A5.23 specifications for Low Alloy Steel Electrodes and Fluxes for Submerged Arc Welding and use Hobart HN-511 flux, a high basic agglomerated flux that produces excellent mechanical properties and easy-to-remove slag.

Compared with equivalent solid electrode classifications, the Metalloy B2-S and B3-S electrodes provide higher deposition rates and better penetration profiles – both features that improve productivity and weld quality.

They also bridge moderate gaps more readily than solid electrodes, helping to minimise weld defects such as undercut or lack of fusion.

The Metalloy B2-S submerged arc electrode deposits weld metal with 1.25 per cent chrome and 0.5 per cent molybdenum and can be used for high service temperature applications, including heat exchangers, boiler and power piping and valves.

The welds created by Metalloy B2-S electrodes maintain good tensile strength in the as-welded or post-weld heat-treated (PWHT) condition and offer reliable corrosion resistance.

The Metalloy B3-S electrodes provide a weld deposit with 2.25 per cent chrome and one per cent molybdenum, while also creating weld deposits that maintain high strength and provide good oxidation resistance at service temperatures of up to 800F (425C).

Hobart Brothers offers Metalloy B2-S and Metalloy B3-S submerged arc electrodes in diameters of 3/32in, 1/8in and 5/32in in 60lb coils.

Additional drum packaging is available upon request.

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