Hot Press Bonding of Aluminum Alloy AA6061-T6 to Polyamide and Polyamide Composites

Abstract

In this study, aluminum alloyAA6061-T6 was joined by a hot press process with three types of material; polyamide PA 6.6 (nylon), 1% carbon nanotube/PA6.6 and 30% carbon fiber/PA6.6 composites. Three parameters were considered in the hot pressing; temperature (180, 200 and 220°C), pressure (2, 3, 4, 5 and 6 bar) and time of pressing (1, 2, 3, 4 and 5 minutes for 200ºC, and 0.25, 0.5, 0.75, 1 and 1.25 minutes for220ºC). Applied pressure has great effect on shear strength of the joint, corresponding to bonding time and temperature. Maximum shear strength was 8.89MPa obtained for PA6.6 at bonding conditions of 4 bar, 220ºC and 0.75 minute. For 30% carbon fiber/PA6,6 shear recorded was 8MPa at 4 bar, 220°C and 1 minute, while 1% carbon nanotube/PA6.6 was registered at 8MPa at 4 bar, 220ºC and 0.75 minute. Mechanical interlocking of polyimide in anodizing surface is 8μm approximately. The melting point and glass transmission temperature of polyimide and composites are decreased after hot pressing.

Extraction, modeling and impact analysis of porosity defects formed in the CFRTP/Al6061 laser direct joining process

“…11 The second is thermomechanical interlocking, which refers to friction self-riveting, 12 friction riveting, 13 fused deposition modeling-based joining, 14 friction stir lap welding, 15 injection clinching joining, 16 friction stir interlocking, 17 and friction-based filling stacking. 18 The third is thermomechanical joining, such as laser direct joining, 19 ultrasonic joining, 20 friction assisted joining, 21 hot press joining, 22 resistance spot joining 23 and injection molding, 24 etc. Thereinto, the technologies belonging to the third category can minimize the deformation and damage of the component surface, and also completely avoid the use of attachments, which are the key to improve joining qualities from the source.…”