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Solder joint degradation models at different degradation stage were established. Finally, through strain simulation, the models can predict the strain accumulation time and failure time effectively under each failure mode, and their prediction accuracy is above 85%.To investigate the role of different distribution forms of Fe-Cr-C cladding layer in the impact abrasive wear performance of Hadfield steel, the over-lapped Fe-Cr-C cladding layer and dot-shaped Fe-Cr-C cladding layer were deposited, respectively, by plasma transferred arc (PTA