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一、铝热剂焊接工艺基本原理及其组成铝热剂焊接是根据:铝在足够高的温度下,与氧有很大的化学亲和力,可以从很多金属氧化物中夺取氧,而把金属还原出来,例如还原铁、铬、锰、钨等,同时放出一定的热量(1Kg的铝热剂约放出926.6千卡热量),使反应产物加热到3000℃左右这一原理进行的。在冶金工业中也经常采用铝热剂作为焊剂。铝热焊剂的组成可分为三部分:①主要组成:铝粉、氧化铁、铁钉头和铁合金、石墨等;②辅助材料:镁砂、石棉板、坩锅、堵口钉、铁帽等;③引燃剂。二、铝热剂焊接工艺的特点 1.由于铝与氧亲和力大,在燃烧时生
First, the basic principle and composition of thermite welding process Thermite welding is based on: aluminum at a sufficiently high temperature, and oxygen have a great chemical affinity, can take a lot of metal oxide oxygen, while the metal reduction For example, the reduction of iron, chromium, manganese, tungsten, etc., at the same time release a certain amount of heat (1Kg about 926.6 kcal thermite release agent), the reaction product was heated to about 3000 ℃ this principle. In the metallurgical industry often use thermite as flux. Aluminum thermal flux composition can be divided into three parts: ① main components: aluminum powder, iron oxide, iron nail head and iron alloy, graphite, etc .; ② auxiliary materials: magnesia, asbestos, crucible, nail plug, iron hat, etc. ; ③ ignition agent. Second, the characteristics of thermite welding process 1. As aluminum and oxygen affinity, the students in the combustion