The characteristics of temperature variation for laser diode welding system have been analyzed with numerical investigation. The laser diode is assembled with a cap and stem by projection welding. Resistance heat, in this process, is generated by electric current at the contact surface between cap and stem within a very short time. Temperature variation of laser diode is largely affected by the welding time and the heat generated from the surface. Maximum temperature of each component in the laser diode should be lower than the melting point except for cap and stem in order to prevent welding defect. Temperature distribution of each component in the laser diode is also affected by thermal conduction mechanism. Welding defect near the insulator occurs when the resistance heat is high. Appropriate resistance heat supply to the laser diode was about 400W. The results from this study could be applicable for optimal design of laser diode welding system.

• 임성진(Division of Mechanical and Automotive Engineering of Wonkwang University) | Sung-Jin Lim
• 허진석(Division of Mechanical and Automotive Engineering of Wonkwang University) | Jin-Seok Heo
• 채용배(Division of Mechanical and Automotive Engineering of Wonkwang University) | Yong-Bae Chae
• 이상호(Member, Division of Mechanical and Automotive Engineering of Wonkwang University) | Sang-Ho Lee Corresponding Author