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矿山采掘、铁路修建、战备工程、基本建设和农田水利等部门,为了适应施工中凿岩作业的需要,一般都设有修制钎具的锻钎班组。据调查,一些单位存在着设备不配套、工艺不完善的问题。例如,钎尾热处理中,只有淬火,没有回火。所以,在使用过程中,由于硬度不当(要求洛氏硬度H_(RC)=50～52),部分钎尾出现堆顶(硬度过低)和炸顶(硬度过高)现象。这是我国矿山或用钎部门的钎杆寿命低的重要原因之一。为了扭转这一局面,现简略介绍一下电阻外热式低
Mining and mining, railway construction, combat readiness construction, capital construction and farmland water conservancy and other departments, in order to meet the needs of rock drilling operations, are generally equipped with brazing forging group drill. According to the survey, some units are not equipped with equipment, technology is not perfect. For example, solder tail heat treatment, only quenching, no tempering. Therefore, due to improper hardness (Rockwell hardness H_ (RC) = 50 ~ 52 is required), some brazing tips appear pile top (too low hardness) and fried top (excessive hardness) during use. This is one of the important reasons for the low life of drill rod in mine or brazing sector in our country. In order to reverse this situation, now briefly introduce the thermal resistance of low resistance