全位置焊高频励磁装置工作特性分析

Analysis of working character of all position welding based on exterior high frequency excitation device

关键词:  全位置  熔池  励磁装置  涡流  串联谐振

Key words:  all position welding  weld pool  excitation device  eddy current  series resonance

摘要:

为了防止全位置MAG焊熔池铁水流淌,研制开发了基于电涡流效应的励磁装置,在熔池内产生可抵消重力的外加电磁力.但是在试验中发现交变励磁电源有效功率在高频阶段输出受到很大限制,对励磁负载回路进行了分析,发现励磁负载回路中的感应环节造成交变电源高频工作时,感抗过大.为此在研究中提出在高频工作时采用串联谐振技术减小感性负载影响.结果表明,该方案有效提升了交变电源功率输出,并对励磁回路等效电阻和等效电感特性进行了研究和讨论,为励磁装置自动功率控制奠定了基础.

Abstract:

In order to prevent molten iron to drop under gravity during all position MAG welding, an excitation device is developed on the base of eddy current effect, which can generate Lorenz force in weld pool. However, the power output of alternative electricity power is restricted at high frequency. Therefore, the excitation load circuit is researched. The inductive link is found in the circuit which results in inductive resistance large too much at high frequency. Then, the technology of series resonance is applied to decrease the effect of inductive resistance at high frequency. Experiment results show that this scheme can promote output of alternative electricity power. On the basis, the equivalent resistance and equivalent inductance are analyzed and studied, which is beneficial for excitation device power auto control.