Apparatus and method for joining steel material and dissimilar material, and joined member manufactured thereby
The method addresses the challenge of weak bonds in ultra-high strength steel joints by using localized laser softening and a specialized riveting apparatus to ensure effective rivet penetration and deformation, resulting in a strong and durable joint.
WO2026134716A1PCT designated stage Publication Date: 2026-06-25POHANG IRON & STEEL CO LTD
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- POHANG IRON & STEEL CO LTD
- Filing Date
- 2025-11-19
- Publication Date
- 2026-06-25
AI Technical Summary
Technical Problem
Conventional methods for joining ultra-high strength steel with dissimilar materials, such as SPR riveting, face challenges in achieving sufficient joint strength due to the rivet's inability to penetrate and deform properly, leading to fragile bonds.
Method used
A method and apparatus that includes localized softening of the steel area using a laser beam to prepare a softened region before SPR joining, combined with a specialized riveting device and temperature control, ensuring proper rivet penetration and deformation.
Benefits of technology
The method achieves a strong and durable joint between ultra-high strength steel and dissimilar materials by ensuring the rivet penetrates and deforms effectively, enhancing the bond strength and material properties.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure KR2025019113_25062026_PF_FP_ABST
Abstract
The present invention relates to a method and apparatus for joining a steel material and a dissimilar material. A joining apparatus according to one embodiment of the present invention may comprise: a rivet coupling fastening unit composed of a punch and a die; a laser beam irradiation device for irradiating a to-be-joined workpiece, positioned between the punch and the die, with a laser beam; and a temperature measurement device for measuring the temperature of a heated zone of the workpiece heated by laser beam irradiation.
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