铸管厂广大革命职工本着毛主席提出的“自力更生,艰苦奋斗”革命精神,组成以老工人为主体的三结合研究小组,自装1.5吨感应炉。经过反复研究试验,用不到半年的时间克服了重重困难,于1971年末成功地投入了试验生产,实践中体现了如下优点: 1.能熔炼多种金属(钢、铁、铜都可); Based on the “self-reliance and hard work” revolutionary spirit put forward by Chairman Mao, a large number of revolutionary workers in the foundry have formed a three-pronged research group with old workers as the main body and installed a 1.5-ton induction furnace. After repeated research and experiments, it took over half a year to overcome the difficulties and successfully put into trial production in the end of 1971. The practice shows the following advantages: 1. It can melt a variety of metals (steel, iron and copper);