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首页> 外文期刊>Metals and Materials International >Effect of Gap Bridging Distance on the Weldability of Aluminum Alloy to Galvanized Steel Joints in AC Pulse GMAW
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Effect of Gap Bridging Distance on the Weldability of Aluminum Alloy to Galvanized Steel Joints in AC Pulse GMAW

机译：Effect of Gap Bridging Distance on the Weldability of Aluminum Alloy to Galvanized Steel Joints in AC Pulse GMAW

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Abstract In joining of aluminum alloys to hot-dip galvanized (GI) steel by gas metal arc welding (GMAW), it is limited to attain a proper joint strength due to the unavoidable growth of brittle Fe-Al intermetallic compound (IMC) layer and the formation of porosities at the root area by the drastic evaporation of zinc layer. Because the formation of those factors is highly related to the temperature variation at the joint interface, the present study focused on restricting the growth of IMC layer and porosities formation by applying the gap bridging between the base metals to decrease the heat input at the joint interface. The effect of the gap bridging distance on the joint properties of 1.2?mm thick AA5052 aluminum alloy to 1.2?mm thick GI steel lap joints by 1.2?mm diameter AA4047 filler wire adopted alternating current (AC) pulse GMAW was investigated. A comparative experimental study on the joints was carried out by evaluating the joint characteristics through macroscopy, scanning electron microscope with energy dispersive X-ray spectroscopy. Moreover, the mechanical strength of the joints was investigated through tensile-shear strength test to secure the reliability of AC pulse GMAW process. It was found that the decreased heat input by gap bridging restricts the IMC layer growth and the formation of zinc porosities. The highest average tensile-shear strength was increased to 180.4?MPa in 0.5?mm gap bridging condition. The results showed approximately 10?MPa higher joint strength with smaller error range compared to the conventional joints showed. Graphical Abstract

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