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Abstract
Recent reports on sintering and bonding using the pulsed electric current bonding process indicate that the metals are subjected to Joule heating due to the electrical resistance at the contact points. However, the influence of bonding conditions on local heating phenomena and joint quality remains unclear. In this study, the effects of bonding conditions (bonding temperature, pressure, surface roughness, interlayer, electric current wave and so on) on joint efficiency are investigated using 5052A1 and 6063A1 in pulsed electric current bonding.
The joint strength of 5052A1 and 6063A1 are improved using 2024A1 as the interlayer between the bonding interfaces. The joints with the 2024A1 powder as the interlayer are stronger than ones with 2024A1 plate, and are as strong as the base metal. The improvements of the joints depend on effective heat generation at the bonding interface due to the electrical resistance. It is 0.08 g (thickness: 0.04 mm), enough for the amount of powder between the bonding interfaces. The dispersion of the powder from the joints does not occur under various conditions.
The surface roughness and electric current wave (direct current, duty ratio, pulse frequency) have no effect on the joint strength. With the increase of bonding temperature and pressure, the deformation of the joints increases. Then bonding temperature and pressure have to be selected to prevent a big deformation of joint configuration.
Notes
1. Present address: Bridgestone Corporation, Tokyo, Japan.