玉门石油管理局勘探指挥部钻具大队在用旧钻杆进行加工改制工作中,需用手工焊接。但遇到一些钻杆带有磁性,很难进行焊接。他们利用电磁的基本原理,使用直流电焊机,用电焊线(地线比较方便)在焊接的钻杆上缠绕数圈,一般绕在中间部位。电焊时电流通过绕 Yumen Petroleum Administration Exploration Headquarters drill brigade in the use of old drill pipe processing and restructuring work, the need for manual welding. But encountered some drill pipe with magnetic, it is difficult to weld. They use the basic principle of electromagnetism, the use of DC welding machine, electric wire (more convenient ground) in the welding of the drill pipe wrapped several times, usually around the middle part. Welding current through the winding