How do you develop a joining strategy for a mixed-material body structure?

Mixed-material joining strategy: 1) Material combinations analysis - identify steel-steel, aluminum-aluminum, steel-aluminum interfaces and requirements (structural, sealing, appearance); 2) Joining technology selection - RSW for steel-steel, SPR or adhesive for aluminum, mechanical fastening or structural adhesive for dissimilar metals; 3) Galvanic corrosion prevention - barrier coatings, sealers, design separation of bare metals; 4) Process sequence planning - accommodate different joining equipment, fixture requirements, and thermal cycles; 5) Quality assurance - develop testing methods for each join type, establish process monitoring; 6) Repair strategy - field repairability considerations. Design for manufacturing feedback influences material choices and joint locations. Cost modeling compares joining technology costs including cycle time, consumables, and equipment investment.