一种气保护焊丝及其制备方法和应用

By using the Si-Ni-Mo-Cu-Sn alloy system and optimizing the welding wire preparation method, the problem of insufficient corrosion resistance and low-temperature toughness of gas-shielded welding wire in crude oil storage tanks was solved, achieving high corrosion resistance and low-temperature toughness of the welded joint, meeting the corrosion standards of the International Maritime Organization.

CN117564537BActive Publication Date: 2026-07-17YANSHAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
YANSHAN UNIV
Filing Date
2024-01-02
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing gas-shielded welding wires lack sufficient corrosion resistance and low-temperature toughness in crude oil storage tanks, resulting in high corrosion rates at welded joints that fail to meet the corrosion standards of the International Maritime Organization.

Method used

By adopting the Si-Ni-Mo-Cu-Sn alloy system and optimizing the content of alloying elements and welding process, the corrosion resistance and low-temperature toughness of the welding wire are improved. This includes alloy composition design and welding wire preparation methods, ensuring uniform corrosion and grain boundary stability of the weld metal.

Benefits of technology

Under simulated corrosion conditions, the annual corrosion rate of the welding wire was reduced to 0.54–0.80 mm/a, the corrosion step between the weld and the base metal was less than 20 μm, and the low-temperature impact absorption energy Akv of the weld metal reached 81–145.2 J, which significantly improved the corrosion resistance and toughness of the welded joint.

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Abstract

本发明提供了一种气保护焊丝及其制备方法和应用，属于特种焊接材料技术领域。本发明提供了一种气保护焊丝，化学成分按质量百分比计包括C0.03～0.06％、Si 0.20～0.40％、Mn 1.00～1.40％、P≤0.012％、S≤0.005％、Ni0.1～0.6％、Mo 0.10～0.30％、Cu 0.20～0.40％、Ti 0.02～0.06％、Ce 0.01～0.05％、La 0.01～0.05％、Zr≤0.03％、Mg≤0.003％、Sn≤0.03％和余量的Fe。本发明采用Si‑Ni‑Mo‑Cu‑Sn合金体系提高了基体和晶界的腐蚀性；通过优化合金元素提高了焊丝的低温韧性。
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