熱可塑性樹脂のレーザ溶着における温度と光弾性縞の同時観察(機械要素,潤滑,工作,生産管理など)

概要

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In this report, the relations between temperature distribution and photoelastic fringes in laser welding process are discussed. Temperature of the workpiece is measured using an infrared camera, while photoelastic fringes are observed by a video camera. It is found that characteristic photoelastic fringes that reflect residual stress begin to appear when the temperature of molten region falls below the glass transition point of the thermoplastic resin. It is also found that the characteristic photoelastic fringes reach almost steady state when temperature near welded region falls about 40℃. Sufficient temperature of the molten region over the crystallization melting point is necessary for a suitable conjunction by the laser welding process. It is observed that the temperature of welded spot increases and the welded region begins to foam when contacting pressure of the welded region is decreased.
社団法人日本機械学会の論文
2009-02-25