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This article reviews weldability of aluminum alloys and factors that affect weld performance. It first addresses hot tears, which can form during the welding of various aluminum alloys. It then presents comparison data from different weldability tests and discusses the specific properties that affect welding, namely oxide characteristics; the solubility of hydrogen in molten aluminum; and its thermal, electrical, and nonmagnetic characteristics. The article addresses the primary factors commonly considered when selecting a welding filler alloy, namely ease of welding or freedom from cracking, tensile or shear strength of the weld, weld ductility, service temperature, corrosion resistance, and color...

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