• Journal of the Microelectronics and Packaging Society
• /
• v.26 no.4
• /
• pp.1-6
• /
• 2019

Recently, as electric vehicles and hybrid vehicles are widely used, the use of rechargeable batteries is increasing. Electric and hybrid cars are made up of hundreds to thousands of electric cells depending on the car model. And the assembly process of the cells and modules requires a variety of bonding process. Meanwhile, in order to connect several cells in series, Cu used as a cathode and Al of an anode must be bonded. In this paper, the characteristics of Al and Cu metals, laser types, characteristics and principles of welding lasers for welding of Cu and Al electrodes are introduced.

• Journal of Welding and Joining
• /
• v.22 no.1
• /
• pp.38-41
• /
• 2004

• Journal of Welding and Joining
• /
• v.33 no.4
• /
• pp.17-23
• /
• 2015

Laser-gas metal arc hybrid welding has been considered as an alternative process of gas metal arc welding for offshore pipe laying. Fiber delivered high power lasers which enable deep penetration welding were recently developed but high power welding characteristics were not fully understood yet. In this study, the influence of shielding gas composition on welding phenomena in high power laser welding was investigated. Bead shapes, melt ejection and dropping were observed after autogenous laser welding with 100% Ar, Ar-20% $CO_2$, Ar-50% $CO_2$, and 100% $CO_2$ shielding gas. Process parameter window was widest with Ar-50% $CO_2$ shielding gas and the penetration was deepest with 100% $CO_2$ shielding gas. The melt dropping was not observed when Ar-50% $CO_2$ or 100% $CO_2$ shielding gas was supplied.

• Proceedings of the KWS Conference
• /
• 2005.06a
• /
• pp.97-99
• /
• 2005

Laser arc hybrid process is actively researched as a new welding method since it has several advantages by the combination of laser beam and electric arc. By the coupling of two different heat sources, laser and arc mutually assist and influence. High power laser can make the deep keyhole and arc plasma can form the large bead shape. In this paper the effect of two different heat sources to weld bead are investigated and as a result of analysis, it is shown that the lower part of keyhole is heated by laser and the upper part of weld pool is dominantly heated by arc.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.40 no.7
• /
• pp.667-672
• /
• 2016

This study presents results of an experimental investigation of the laser-arc, hybrid, butt welding process of SS400 structural steel. Welding parameters including laser power, welding current and speed were varied in order to obtain one-pass, full-penetration welds without defects. The conditions that resulted in optimal beads were identified. After welding, hardness measurements and microstructure observations were carried out in order to study weld properties. The mechanical properties of both the base material and welded specimen were compared based on the results of tensile strength measurements. The yield and tensile strengths were found to be similar.

• Journal of Welding and Joining
• /
• v.21 no.7
• /
• pp.1-3
• /
• 2003

• Journal of Welding and Joining
• /
• v.21 no.5
• /
• pp.479-481
• /
• 2003

• Journal of Welding and Joining
• /
• v.21 no.6
• /
• pp.1-2
• /
• 2003

• Journal of Welding and Joining
• /
• v.22 no.1
• /
• pp.7-9
• /
• 2004

• Journal of Welding and Joining
• /
• v.22 no.1
• /
• pp.18-25
• /
• 2004