Nd:Yag laser irradiation of single lap joints made by polyethylene and polyethylene doped by carbon nanomaterials

Plasma Physics by Laser and Applications 2013 Conference

Visco, A.M.^1 ; Brancato, V.^1 ; Cutroneo, M.^2 ; Torrisi, L.^2

Department of Electronic Engineering, Chemistry and Industrial Engineering, University of Messina, C.da Di Dio, 98166, Messina, Italy^1

Department of Physics and Earth Science, University of Messina, C.da Papardo 31, 98166, Messina, Italy^2

关键词: Calorimetric analysis;    Carbon nano-materials;    Laser exposition;    Mechanical shear;    Morphological analysis;    Nd: YAG laser irradiation;    Single lap joints;    Transmission laser welding;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/508/1/012027/pdf
DOI  :  10.1088/1742-6596/508/1/012027

来源: IOP

【 摘 要 】

Thermoplastic polyethylene can be welded by the transmission laser welding technique (TTLW) that exhibits some process related benefits with respect other conventional joining methods. This justifies its large use in wide fields, from the automotive to medical or domestic appliances. In this research, we studied single lap joints made by polyethylene pure and filled with carbon nanomaterials (0.2% in weight) to make the polymer laser absorbent. The joints were irradiated by a Nd:YAG laser operating at 1064 nm (first harmonic) with an intensity of 107W/cm2and 1 ÷ 30Hz, a maximum pulse energy of 300mJ and a laser spot of 1 cm2(no focusing lens were employed). The joints were characterized by morphological analysis, mechanical shear tests and calorimetric analysis. The results suggested that the laser exposition time must be opportunely balanced in order to avoid a poor adhesion between the polymer sheets and to realized efficient joints. In particular the mechanical test showed that the laser exposition time of 40 seconds is the best conditions to obtain the highest shear strength of the joints of 140 N. After too prolonged laser exposure times, degrading phenomena starts.