Arc brazing has, in comparison to arc welding, the advantage of less heat input while joining galvanized sheet metals. The evaporation of zinc is reduced in the areas adjacent to the joint and improved corrosion protection is achieved. In the automotive industry, lightweight design is a key technology against the background of the weight and environment protection. Structured sheet metals have higher stiffness compared to typical automobile sheet metals and therefore they can play an important role in lightweight structures. In the present paper, three arc brazing variants of galvanized structured sheet metals were validated in terms of the corrosion behavior. The standard gas metal arc brazing, the pulsed arc brazing, and the cold metal transfer (CMT®) in combination with a pulsed cycle were investigated. In experimental climate change tests, the influence of the brazing processes on the corrosion behavior of galvanized structured sheet metals was investigated. After that, the corrosion behavior of brazed structured and flat sheet metals was compared. Because of the selected lap joint, the valuation of damage between sheet metals was conducted. The pulsed CMT brazing has been derived from the results as the best brazing method for the joining process of galvanized structured sheet metals.
Es wird versucht mit „altem” Werkstoff und verbesserter konstruktiver Lösung (Strukturierung) sowie mit angepasster Fügetechnik die Eigenschaften der Bleche zu verbessern. Das meistverbreitetste Prüfverfahren von strukturiertem Halbzeug (einzelne Bleche, Sandwiches) ist der Biegeversuch. Strukturierte Bleche zeichnen sich durch ihre hohe Biegesteifigkeit aus. Sie zeigen aber gleichzeitig strukturbedingt eine gewisse Anisotropie. Die Literaturrecherche hat gezeigt, dass bei vielen Untersuchungen keine speziellen Anforderungen an die Prüfungen von strukturierten Werkstoffen gestellt wurden. Das betrifft besonderes Strukturanordnung, -richtung und -lage der Probe gegenüber dem Biegedorn bei Biegeversuchen, d. h. die Richtung der aufgebrachten Kraft gegenüber der Struktur. Das Ziel der diesem Beitrag zugrunde liegenden Forschungsarbeiten war es festzustellen, welchen Einfluss die Prüfbedingungen auf das Biegeverhalten ausüben. Hierzu wurden wabenstrukturierte Bleche im 3-Punkt-Biegeversuch untersucht. Biegesteifigkeit und Leichtbaupotenzial wurden in Abhängigkeit vom Ort der Aufbringung der Belastung berechnet und für verschiedene Strukturanordnungen, -richtungen und -lagen verglichen. Der Einfluss der Anisotropie auf das Biegeverhalten der wabenstrukturierten Bleche wurde dabei als mäßig bezeichnet
One main problem of thin-walled, large-area sheet components for lightweight construction solutions is the inadequate stiffness. One approach for a solution is provided by structured sheets which have an increased flexural stiffness due to three-dimensionally incorporated structures up to 3 times compared with flat sheets. Since few systematic investigations have been conducted on structured sheets in the field of characterization, forming, welding and joining technologies and corrosion until now, there is a lack of knowledge in the field of cutting technologies. The aims of the presented work is to qualify the plasma cutting process for thin structured sheets as an alternative to laser cutting. The qualification of the process was carried out with roughness and straightness measurements and by assessing the absence of burrs. The results obtained show the good quality of plasma cutting on structured sheets and were compared with the results of qualified laser beam cuts.
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