High-toughness gas shielded welding wire and preparation method and use method thereof

Abstract

The invention discloses high-toughness gas shielded welding wire and a preparation method and a use method thereof. The high-toughness gas shielded welding wire comprises the following chemical components in percent by weight: 0.05-0.09 C, 0.9-2.0 Mn, 0.40-0.65 Si, 0.01-1.0 Ni, 0.01-0.3 Cu, 0.01-0.35Cr, 0.01-0.3 Mo, 0.01-0.15 Ti, 0.020 or less P, 0.015 or less S, 0.001-0.005 O, 0.005-0.025Als, 0.005-0.025 Ca, and the balance of Fe and inevitable impurities. The welding wire simultaneously can satisfy the equation that the carbon equivalent CE=0.38-0.50%. The preparation method of the high-toughness gas shielded welding wire comprises the following steps of: performing the desulfurization treatment on molten steel, smelting by a converter or an electric furnace, refining by ladle furnace or ladle argon blowing, continuous casting, rolling, forming wires by pulling and the like. The mixed gases including 70-90 volume percent of Ar and 10-30 volume percent of rich Ar are adopted as the shielded gas in welding. Practices show that welding seams welded by the high-toughness gas shielded welding wire has higher toughness.

Description

technical field [0001] The invention relates to a gas-shielded welding solid core welding wire, in particular to a high-toughness gas-shielded welding wire and its preparation method and use method. Background technique [0002] Gas shielded welding is easy to automate, has high welding wire deposition rate and good weld shape, so it is widely used. With the increasing toughness required by modern pipelines, pressure vessels, and bridge steel, the performance of welded joints must also match it. The weld structure generally contains proeutectoid ferrite, acicular ferrite, bainite, martensite, etc. With the increase of alloying elements, proeutectoid ferrite decreases and acicular ferrite increases until Bainite, martensite, etc. appear. The weld has the characteristics of cast state, and its strengthening and toughening is mainly achieved by alloying. With the increase of alloying elements in the weld, the strength of the weld increases and the toughness of the weld gener...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a high-toughness gas-shielded welding wire and its preparation method and use method in view of the low stability of the weld seam toughness of the existing gas-shielded welding wire. Process performance and stable high weld toughness, the preparation method, the production process is stable, and the pass rate is high

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