Industrial fluxless laser weld-brazing process of steel to aluminium at high brazing speed

详细信息    查看全文

• 作者：Guillaume Filliard^a ; ^b ; ^{guillaume.filliard@renault.com}Author Vitae ; Mohamed El Mansori^a ; ^{Mohamed.ELMANSORI@ensam.eu}Author Vitae ; Lucio Tirado^b ; ^{lucio.tirado@renault.com}Author Vitae ; Sabeur Mezghani^a ; ^{sabeur.MEZGHANI@ensam.eu}Author Vitae ; Christian Bremont^b ; ^{christian.bremont@renault.com}Author Vitae ; Mathieu De Metz-Noblat^b ; ^{mathieu.de-metz-noblat@renault.com}Author Vitae
• 关键词：Fe&ndash ; Al dissimilar joints ; Flux less laser weld-brazing ; Brazing speed ; Intermetallic layer ; Mechanical strength
• 刊名：Journal of Manufacturing Processes
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：25
• 期：Complete
• 页码：104-115
• 全文大小：5301 K
• 卷排序：25

文摘

AA6016-T4 aluminium and DX56D + Z140M steel sheets were joined by fluxless laser weld-brazing process in industrial conditions and at high brazing speed reaching 6 m/min with ER4043 AlSi5 filler wire. The configuration studied corresponds to an automotive roof/body-side bond application. For each configuration the energy and feeding rate are computed. The resulted intermetallic layer at the Fe–Al interface and its morphology are investigated through hardness, optical microscopy, EDS and EBSD analysis. The maximum thickness of the intermetallic layer is measured for each configuration. The associated mechanical strength is quantified to evaluate the potential of different configurations for an high brazing speed industrial application. Both, thin and thick intermetallic layer presents specific crystallographic orientation. Thin layer presents a small grains microstructures in the opposite of thick layer with bigger grains. For some samples, specific orientations of the intermetallic needles are observed. The configuration with energy of 600 J/cm and a feeding rate of 1.125 (unit-less) stands out as the most significant with an averaged mechanical strength of 101% of the mechanical properties of the filler wire and intermetallic layer with thickness bellow 2 μm. Mechanical fractures are no longer observed at the Fe–Al interface but occurred in the welded area, between the seam and the aluminium sheet.