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在开展群众性节电活动中,不少单位对电焊机加装了“空载自动停电装置”以减少空载损耗,其空载自动停电装置的型式是多种多样的,《焊接》杂志曾在七二年第六期、七三年第六期刊出过两种,所有这些自动停送电是靠操纵电磁开关完成的。在实际运行中我们发现有些操作不熟练的焊工要经几次试起弧才能进行正常焊接,这样电磁开关就要相应吸合、断开几次,再加上换焊条以及焊接工作本身的断续性致使电磁开关吸合断开次数极为频繁,而造成电磁开关触头烧
In carrying out mass energy-saving activities, many units have added a “no-load automatic power-off device” to the welder to reduce no-load loss. The types of no-load automatic power-off devices are varied. In the second period of 1972 and the sixth period in 1973, there are two kinds of automatic stop-and-go electricity that are operated by the electromagnetic switch. In actual operation, we found that some unskilled welders to try after several arcs to normal welding, so that the electromagnetic switch should be the corresponding pull, disconnect a few times, together with the welding rod and the welding work itself intermittent Caused by the nature of electromagnetic switch pull off the frequency is extremely frequent, resulting in electromagnetic switch contacts burn