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http://dx.doi.org/10.5781/JWJ.2014.32.6.56

A Study on the Characteristic of Weld Joint and Tensile Fracture of SUS304 and Cu High-Speed Dissimilar Lap Welds by Single Mode Fiber Laser  

Lee, Su-Jin (Joining and Welding Research Institute, Osaka University)
Kim, Jong-Do (Division of Marine Engineering, Korea Maritime and Ocean University)
Katayama, Seiji (Joining and Welding Research Institute, Osaka University)
Publication Information
Journal of Welding and Joining / v.32, no.6, 2014 , pp. 56-63 More about this Journal
Abstract
To develop and understand dissimilar metals joining of Stainless steel and Copper, ultra-high speed laser lap welding was studied using single mode fiber laser in this study. SUS304 and Cu have large differences in materials properties, and Cu and Fe have no intermetallic compounds by typical binary phase of Cu and Fe system. In this study, ultra-high speed lap welds of SUS304 and Cu dissimilar metals using single-mode fiber laser was generated, and weldability of the weld fusion zone was evaluated using a tensile shear test. To understand the phenomenon of tensile shear load, weld fusion zone of interface weld area and fracture parts after tensile shear test were observed using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) analysis system. And it was confirmed that Cu was easily melting and penetrating in the grain boundaries of SUS304 because of low melting temperature. And high thermal conductivity of copper occurred dissipate heat energy rapidly. These properties cause the solidification cracking in weld zone.
Keywords
SUS304; Cu; Dissimilar welding; Single mode fiber laser; Tensile shear test;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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