Abstract
As brazed joints have to resist static and cyclic loads in corrosive environments, the effect of a condensate corrosion acc. to VDA 230-214 on the mechanical properties of brazed AISI 304L/BAu-4 joints is investigated. A significant and time-dependent degradation of tensile and fatigue properties is determined over 6 weeks. For an evaluation of local deformations within the small area of the brazing seam, the digital image correlation technique in combination with a triggered image acquisition is used during tensile and fatigue tests. Here, an increasing influence of the gauge length on strain values is identified for increasing stress levels, enhanced by notch-containing surfaces of the pre-corroded brazed joints. Fatigue and corrosion fatigue damage processes are evaluated using scanning electron microscopy.
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