A Preliminary Investigation of Joining Methods for Aluminum-Graphite Composites

摘要

Furnace brazing, furnace pressure welding, resistance spot welding, and gas tungsten-arc (GTA) welding all appear to have potential as joining processes for aluminum-graphite composites. At present, the most success has been achieved with furnace brazing. An important development in this process was the discovery that aluminum-silicon-magnesium brazing alloys would bond to the composites. Furnace welding will probably be most useful as a means of producing thick, multilayer composites. Spot welding produced bonding between composites and between a composite and a commercial aluminum alloy sheet. However, metal expulsion and composite crushing were common, and much work is needed to prevent these defects. GTA welding requires an automated process and close control over welding temperatures. (Author)