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管口预热是敷设以高强度钢为管材的油气长输管线焊接前必不可少的一道工序。管口预热有多种方法，以利用中频电磁感应对管口预热为最优。本文根据在库鄯线管口预热中应用中频电磁感应管口预热设备的经验，对中频电磁感应管口预热设备的加热器进行改进，使加热器技术更加完善。
Spout preheating is the laying of high-strength steel pipe for oil and gas pipelines long before the welding process is an essential step. There are several ways to preheat the nozzle to take advantage of the MF induction to optimize the nozzle warm-up. In this paper, based on the experience of applying IF electromagnetic induction nozzle preheating equipment in the preheating of the Chuankou line, the heaters of the MF induction nozzle preheating equipment are improved to make the heater technology more perfect.