Abstract: Objective The purpose was to analyze factors affecting wire feed stability of 4043 aluminum alloy welding wire and provide guidance for quality inspection of aluminum alloy welding wire. Methods Five kinds of 4043 aluminum alloy welding wires commonly used at home and abroad were selected to extract key parameters of wire feed resistance, wire feed speed, wire surface quality and wire tensile properties during welding process, and comprehensive analysis and evaluation was carried out on wire feeding performance. Results Through testing fluctuation of wire feed resistance and wire feed speed during welding process, it was found that fluctuation range of wire feed resistance and wire feed speed of aluminum alloy welding wire from different manufacturers was different. Through observation and analysis of surface quality of aluminum alloy welding wire, it was found that surface microtopography of welding wire was main factor affecting wire feed stability. High surface flatness and less surface scratches could effectively ensure wire feed stability. Tensile properties of aluminum alloy welding wire and microscopic tensile fracture scanning analysis showed that welding wire with few and small pores could ensure tensile properties and improve wire feed stability of aluminum alloy welding wire. Conclusion By extracting standard variance of wire feed resistance and wire feed speed in welding process, wire feed performance of 4043 aluminum alloy welding wire could be evaluated objectively, and it accorded with actual situation. Welding wire with high surface flatness and less microscopic scratches had good wire feeding performance, therefore, in order to improve wire feed stability of 4043 aluminum alloy welding wire, it was necessary to control drawing or scraping process of welding wire strictly. Welding wire with less internal defects had good wire feed performance, therefore, in order to improve wire feed stability of 4043 aluminum alloy welding wire, it was necessary to control smelting process of welding wire strictly.