Abstract
316 L stainless steel (316 L) was successfully joined to PET as a result of laser lap welding from metal side. An excellent joint with a large interfacial bonding was achieved by optimizing laser power and pulse width. Effects of surface texture and ultrasonic on 316 L/PET joint strength were clarified. The results showed that mechanical and chemical bonding were the main connection methods of 316 L/PET joint. Mechanical anchoring effect was the key factor of surface texture to improve the joint strength. There were two positive effects for ultrasonic on 316 L/PET joint strength. On the one hand, the acoustic streaming effect improved the fluidity of PET melt and made it easier to fill the texture. On the other hand, ultrasonic cavitation reduced the bubble rate in the weld and generated high pressure. For received samples, the maximum tensile strength reached 45 MPa, which was close to 86.5 % of the strength of PET matrix.
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