近年来我们自制了不少电阻炉,箱式炉使用得还比较理想,但井式电阻炉使用不久由于电阻丝变形大,有的脱出砖槽与马弗罐接触形成短路,造成电阻丝熔断等早期损坏。我们认为要避免这种现象应使电阻丝在安装前内应力松弛(主要是拔制时和缠绕时产生的内应力),这样可避免安装后不久而产 In recent years, we made a lot of resistance furnace, box furnace used is still relatively ideal, but the pit resistance furnace shortly after the resistance wire deformation, and some out of the brick groove contact with the muffle to form a short circuit, causing the resistance wire blown Early damage. In our opinion, to avoid this phenomenon, the internal resistance of the resistance wire should be relaxed before installation (mainly the internal stress during drawing and winding) to avoid the short circuit