적외선 센서를 이용한 초음파 용착부의 마찰열 측정

• Published in: 한국생산제조학회지 Vol. 26; no. 4; pp. 425 - 429
• Main Authors: 김원호(Won-Ho Kim), 강은지(Eun-Ji Kang), 민경탁(Kyung-Tak Min)
• Format: Journal Article
• Language: Korean
• Published: 한국생산제조학회 2017
• Subjects: 기계공학; HAZ; Ultrasonic welding; IR Sensor; Weld temperature; Frictional heat; Thin Ni metal sheet
• ISSN: 2508-5093; 2508-5107
• DOI: 10.7735/ksmte.2017.26.4.425

During ultrasonic welding, plastic deformation, elastic hysteresis, and friction generate heat at the contact portions of the two materials to be welded, theoretically analyzing and experimentally measuring the temperature at the welded part are very important for identifying the heat affected zone. However, the welding temperature during ultrasonic welding wherein welding is performed in less than a second is a challenge. We investigated the effects of welding conditions such as welding time, welding pressure, and the ultrasonic vibration amplitude of horns on the temperature of welded surface of a Ni sheet of thickness 0.1 mm. We used a horn with a resonance frequency of 40 kHz and an ultrasonic welder. The temperature was measured using a intrared sensor, and its characteristics were investigated. Experimental results showed that increase in welding time and pressure and ultrasonic vibration amplitude of horns generally caused the increase in surface temperature of the weld.