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Environmental Durability of the Weldbond, FPL and PABST Joining Systems

机译:Weldbond,FpL和paBsT连接系统的环境耐久性

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This program was conducted as an addendum to Contract No. F33615-76-C-5412, 'Advanced Weldbonding Process Establishment for Aluminum'. Under controlled stress and environmental conditions, a direct comparison of durability and surface corrosion behavior was made for three surface preparation/adhesive systems. These systems included the PABST adhesive bonding system, the FPL adhesive bonding system, and the Northrop weldbond system. The three types of tests used were the wedge test, the constant load-salt water immersion test, and the surface scratch test. Four different environmental exposures were used: (1) 95 to 100 percent relative humidity at 120F, (2) 5 percent salt fog at 95F, (3) 3.5 percent salt water and (4) the sea coast beach site at El Segundo, California. Four material combinations were evaluated for this program: 2024-T3 alclad bonded to 7075-T-6 bare, 2024-T3 bare bonded to 7075-T6-bare, 2024-T3 bare bonded to 2024-T3 bare, and 7075-T6 bare bonded to 7075-T6 bare. The objective of this program was to rank the three bonding systems and four material combinations in terms of durability and corrosion behavior.

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