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Henkel/Loctite's Hysol series and 3M's Scotch-Weld epoxies are good choices. Surface preparation is critical. Review standards on this subject for best practices: ASTM D 2651 Standard Guide for Preparation of Metal Surfaces for Adhesive Bonding and ISO 17212 Structural adhesives -- Guidelines for the surface preparation of metals and plastics prior to adhesive bonding.
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