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本文分析了焊接过程可编程控制系统中输出触点损坏的原因，提出了保护措施。着重讨论了交流电感性负载回路加上阻容保护后可能产生谐振的条件和由谐振引起的不良后果，介绍了如何检测电路发生谐振和消除谐振的措施。
This paper analyzes the welding process programmable control system in the output contact damage, put forward the protective measures. This paper focuses on the possible resonance conditions caused by the AC inductive load circuit coupled with the RC protection and the adverse consequences caused by the resonance. The measures to detect the resonance of the circuit and eliminate the resonance are introduced.