三层复合铝合金带材是以铝锰系合金为芯材、双面包覆铝硅系钎料合金的多层复合材料，是制造管带钎焊式热交换器的重要材料之一，在实际钎焊过程中对钎料层的包覆率有严格要求。分析了影响三层复合铝合金带材热轧复合时包覆率的变化因素，结合生产工艺要求，提出了热轧复合包覆率的数学模型，为实际生产中包覆率的控制提供了依据 The three-layer composite aluminum alloy strip is a multi-layer composite material made of aluminum-manganese alloy as a core material and double-coated aluminum-silicon alloy solder alloy. It is one of the important materials for manufacturing a tube brazed heat exchanger. The actual brazing process of the solder layer cladding rate has strict requirements. Based on the analysis of the factors that affect the coverage rate of hot-rolled composite aluminum alloy strip, the mathematical model of hot-rolled composite coating rate is proposed in combination with the requirements of the production process, which provides a basis for the control of the cladding rate in the actual production