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一、铝热焊基础为了便于铝热反应和降低费用,要注意模子及尾部的装配。铝热剂由铁和铁的氧化物及细铝粉的混合物组成,这些成分构成基本是放热物质、附加合金和添加的还原剂。产热剂的基本成分是由热化学方程式的计量计算决定的。实验表明,最好的铝热剂是含FeO小于15％的Fe_2O_3。这种铝热剂理论上产生大约2890℃的反应温度。但是,少量的铝热剂(<2000克)最好是含FeO量少于7％。此外,添加某些合金元素可获得更好的机械性能(降低了反应温度,还原钢的温度是2100～2200℃,即达到了实际的焊接温度)。二、焊接工艺过程如果钢筋头采用机械剪切或氧气切割,那么无论是水平还是垂直位置的连接都不需
First, the basis of aluminum welding In order to facilitate the reaction and reduce the cost of aluminum, pay attention to mold and tail assembly. Thermite consists of a mixture of oxides of iron and iron and finely divided aluminum. These constituents constitute essentially exothermic substances, additional alloys and added reducing agents. The basic composition of the heat-generating agent is determined by the thermochemical equation. Experiments show that the best thermite is Fe_2O_3 containing FeO less than 15%. This thermite theoretically yields a reaction temperature of about 2890 ° C. However, a small amount of thermite (<2000 g) preferably contains less than 7% FeO. In addition, the addition of some alloying elements gives better mechanical properties (lower the reaction temperature, reducing the steel temperature is 2100 ~ 2200 ℃, that is, to the actual welding temperature). Second, the welding process If the steel head with mechanical shear or oxygen cutting, then either the horizontal or vertical position of the connection is not required