用氢氮混合气替代氢气保护气体的论证

Argument on mixture of hydrogen and nitrogen to replace hydrogen as prote ctive gas

根据应用实例分析比较获取氮氢混合气方法的三种方案,提出用外购氢气和液氮混合制取氮氢混合气的方案具有综合优势。

On the basis of application examples analyzes and compares 3means to obta in the mixture of hydrogen and nitrogen.Suggests mea n to obtain the mixture through mixer after purchase of hydrogen and ligui d nitrogen,which have comples advant ages.