在设备制造、安装和修理工作中,常常要遇到在特殊位置进行焊接和气割的操作。对受工件本身结构或其他物件妨碍而难以操作的特殊焊接和气割,应用折光镜观象,并借助于适当的工具,可以较好地施工。为此,焊割工具也作了适当的改革。 In the equipment manufacturing, installation and repair work, often encountered in a special location for welding and gas cutting operations. For special welding and gas cutting which are difficult to operate due to the structure of the workpiece itself or other objects, the use of a refractometer is possible and the construction can be carried out with the aid of suitable tools. To this end, Hange tools also made the appropriate reforms.