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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Welding Parameters on the Corrosion Behavior of Dissimilar Alloy Welds of T6 AA6061 Al-Galvanized Mild Steel
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Effect of Welding Parameters on the Corrosion Behavior of Dissimilar Alloy Welds of T6 AA6061 Al-Galvanized Mild Steel

机译：焊接参数对T6 AA6061 Al镀锌温和钢异种合金焊缝腐蚀行为的影响

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摘要

Partial replacement of steel by Aluminium?(Al) alloys is a promising approach adopted by automotive sector to improve fuel efficiency without compromising on the strength. However, this results in the generation of dissimilar welds of Al alloys and steel. Understanding the corrosion behavior of Al alloys–steel welds as a function of welding parameters is critical in the successful application of such alloys. The present study reports the intergranular corrosion behavior of T6 heat-treated AA6061 Al alloy-galvanized mild steel lap joints, welded by metal inert gas welding–brazing technique as a function of different welding parameters, viz. weld speed (4-6?m/min) and wire feed rate (0.8-0.9?m/min), following ASTM G 67-04. Weld characterization was performed by field emission scanning electron microscopy (FESEM), x-ray diffraction and nano-hardness measurement. Results indicate heavy dissolution and metal loss at the interface. A high volume fraction of Al-Fe intermetallics was precipitated at the weld interfaces, resulting in high hardness and higher localized corrosion. The thickness of Al-Fe intermetallic layer increased with increasing wire feed rate and lower weld speed which enhanced the severity of galvanic and intergranular corrosion.
机译：铝制替代钢铝合金（Al）合金是汽车领域采用的有希望的方法，以提高燃油效率而不会影响力量。然而，这导致铝合金和钢的不同焊缝产生。理解Al合金 - 钢焊缝的腐蚀行为作为焊接参数的函数在成功应用这种合金的过程中至关重要。本研究报告了T6热处理AA6061 AL合金镀锌温和钢圈接头的晶间腐蚀行为，由金属惰性气体焊接技术焊接，作为不同焊接参数的函数，VIZ。焊接速度（4-6？M / min）和送丝速率（0.8-0.9？m / min），遵循ASTM G 67-04。通过现场发射扫描电子显微镜（FESEM），X射线衍射和纳米硬度测量进行焊接表征。结果表明界面的重溶解和金属损耗。在焊接界面处沉淀出高容积的Al-Fe金属间化合物，导致高硬度和更高的局部腐蚀。 Al-Fe金属间层的厚度随着送料速率的增加和较低的焊接速度而增加，这提高了电流和晶间腐蚀的严重程度。

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