Back to results
US 2024/0042541 A1Published application
Welded structural member having excellent crack resistance and manfuacturing method thereof
AssigneePosco
InventorYoung-Hune Kim
Life of this patent
Estimating the term…
Abstract
The present invention relates to a welded structural member having excellent corrosion resistance and crack resistance, and a method for manufacturing same.
Claims13
A welded structural member, comprising:
- a first steel sheet;
- a second steel sheet;
- and
- a welded joint portion bonding the first steel sheet and the second steel sheet,
- wherein at least one of the first steel sheet and the second steel sheet is a plated steel sheet having a Zn—Al—Mg-based plating layer,
- wherein a microstructure of a portion of the Zn—Al—Mg-based plating layer, closest to the welded joint portion includes, by area fraction:
- 20 to 40% of a Zn—Mg-based intermetallic compound.
4 more elements
A manufacturing method of a welded structural member, comprising operations of:
- preparing a first steel sheet and a second steel sheet;
- forming a welded joint portion by arc welding the first steel sheet and the second steel sheet using any one of welding materials selected from a solid wire, a flux-cored wire, and a shielded metal arc welding rod;
- and
- water cooling the same to an average cooling rate of to 110° C./s, based on a surface temperature of the welded joint portion,
- wherein at least one of the first steel sheet and the second steel sheet is a plated steel sheet having a Zn—Al—Mg-based plating layer.
2 more elements
Dependencies are inferred from the claim text.