易熔合金塞(以下简称易熔塞)是压力容器或气瓶的安全附件之一。常用的易熔塞有三种结构型式(见图 1)。所谓易熔合金,一般系指熔点低于200℃的合金,由铋、铝、锡及镉等三、四种金属元素组成。易熔塞就是利用这种低熔点合金充填塞的中心孔。在正常的使用温度范围内,容器内的气体 Fusible alloy plug (hereinafter referred to as fusible plug) is a pressure vessel or gas cylinder safety accessories. There are three commonly used fusible plug structure (see Figure 1). The so-called fusible alloy, generally refers to the melting point of less than 200 ℃ alloy, bismuth, aluminum, tin and cadmium, three or four kinds of metal elements. Fusible plug is the use of this low melting point alloy filling plug center hole. The gas in the container is within the normal operating temperature range