Higher toughness steel alloy weld deposits and flux-cored welding electrodes for producing higher toughness steel alloy weld deposits

Abstract

The present disclosure is directed to flux-cored welding electrodes designed to produce higher toughness steel alloy weld deposits, and to the higher toughness weld deposits themselves. The weld deposits may comprise less than 0.20 (or less than 0.15) weight percent silicon. The flux-cored welding electrodes comprise a flux core and a tubular steel strip. The flux core may comprise, by weight percent of the electrode, 0.25-0.30% zirconium, 0.12-0.18% aluminum, and 0-0.11% silicon. The metallic zirconium, aluminum, and silicon may be added to the flux core in the form of silicon-zirconium metalpowder and aluminum-zirconium metal powder.

Description

technical field [0001] The present disclosure generally relates to flux cored electrodes for producing higher toughness steel alloy weld deposits, and to the higher toughness weld deposits themselves. Background technique [0002] Essentially, all steel is a mixture, or more properly, an alloy of iron and carbon, of iron and carbon. However, even so-called plain carbon steels have small but specified amounts of manganese and silicon and small (often unavoidable) amounts of phosphorus and sulfur. Plain carbon steels can contain as much as 2.0% carbon, but such alloys are rare. The carbon content of commercially available steels typically ranges from about 0.05% to about 1.0%. [0003] The process by which iron changes from one atomic arrangement to another when heated to 912°C (1674°F) is called a transition. This transformation occurs not only in pure iron, but also in its many alloys; each alloy composition transforms at its own characteristic temperature. It is this tr...

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Problems solved by technology

This causes "atomic chaos" and leads to lattice distortions, which lead to increases in hardness, strength, or both (although it is also possible to increase the brittleness of steel alloys)

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