Abstract
We have developed a new pressure joining process of Al-Cu pipe joints utilizing an eutectic reaction as reported in a previous paper. In this report, the process has been applied for joining Al to Al by using insert foils at the joining interface.
Al-Si hyper-eutectic alloy foils solidified rapidly from the melt was found to have an excellent bondability even in air.
Joints with high mechanical properties comparable to those of Al base metal can be obtained under the following conditions: 1) Si contents in the Al-Si alloy foils are above 20 wt% 2) joining pressures are above 19.6MPa.
The reason for being able to join successfully in air is considered that Al surface layers are melted and cleaned by the reaction between the Si of hyper-eutectic composition and Al.
