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Laser Heating Flow Drill Screw Joining of High-Strength Steel and Aluminum for Strength Enhancement

  • 임성빈 (서강대학교 일반대학원)

초록 (요약문)

In recent years, the automotive industry has seen an increase in fuel efficiency requirements and emission regulations, along with a growing demand for vehicle lightweighting to secure the driving range of electric vehicles. As the use of lightweight materials such as aluminum, high-strength steel, and composites increases for automotive lightweighting, the technology for joining dissimilar materials has become increasingly important. Dissimilar material joining primarily involves non-fusion joining methods such as mechanical fastening and adhesive bonding, with various joining techniques depending on the combination of the materials being joined. Among these, Flow Drill Screw (FDS) joining is a mechanical fastening method that is mainly applied to components requiring flat surface joining, such as profile shapes or large parts, and its usage is increasing. However, FDS joining using high-strength steel presents the issue that joining can only be achieved after pre-hole processing due to the limitations of the fastener. This study investigates FDS joining of the lower plate Al 5052 2.0 mm to upper plates of SPFC590DP 1.4 mm, SPFC780DP 1.4 mm, and SPFC980DP 1.4 mm, following laser heating. Despite differences in the upper plate materials, joining was possible when the laser power was set to 300 W and heating time ranged between 120 and 180 seconds. The temperature was measured at a location 20 mm away from the laser irradiation point, with a target temperature of 600°C.

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목차

1. Introduction 7
2. Experimental set up 9
2.1 Materials 9
2.2 Laser heating FDS 11
2.3 Test method 13
3. Result and discussion 15
3.1 Laser heating FDS according to upper plate material 15
3.2 Comparison of tensile shear strength and Vickers hardness by material 18
4. Conclusion 20
5. Reference 21

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