Esab Spoolarc 44 description: Designed for single or multipass welding where high strength and impact toughness is required. Weld metal tensile strengths of 80 ksi (552 MPa) are maintainable after long term stress relieving (50 hrs or more). The presence of Ni in the wire chemistry helps increase low temperature impact toughness. Applications include pressure vessels, structural supports, and some heat treatable valves and fittings.