High-toughness gas shielded welding wire and preparation method thereof
By constructing a multi-layered composite shell and a fine composite inclusion design, the problem of boron being easily oxidized in high-temperature environments was solved, which improved the tensile strength and low-temperature toughness of the weld metal of the high-strength and tough gas-shielded welding wire, achieving a balance between high strength and low-temperature toughness.
Patent Information
- Application Number
- CN202610648036.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-05-12
- Publication Date
- 2026-06-09
- Estimated Expiration
- 2046-05-12
AI Technical Summary
In existing high-strength and high-toughness gas-shielded welding wires, boron is easily oxidized and nitrided in high-temperature, high-oxygen, and high-nitrogen environments, resulting in coarse borides that affect the strength and low-temperature toughness of the weld. Furthermore, traditional inclusion control methods are insufficient to effectively improve the weld's resistance to cold cracking.
Using calcium-enriched low-polymer borosilicate as the core, a multi-layered composite shell is constructed through a time-sequence modification method of first hydrolyzing and sealing with a reactive aluminum source and then embedding framework-type alumina nanoparticles. Combined with the preferential distribution of cerium element at defect oxygen and residual hydroxyl sites in the outer layer, fine composite inclusions are formed, which improves the low-temperature toughness and cold crack resistance of the weld.
The synergistic design of stable boron release and fine inclusions improves the tensile strength, low-temperature impact toughness and cold crack resistance of the weld metal, ensuring a balance between high strength and low-temperature toughness in the weld.