一、问题的提出 目前,国产埋弧自动焊机均采用下列的方式引弧: 焊丝短路——启动(给电,焊丝上抽)——引弧——焊丝下送——焊接。从这个方式中,可以看出在引弧的瞬间,送丝电动机有个反转过程。为了引弧顺利和可靠,希望这个过程要适当,太长太短均会促使焊丝与焊件钉牢,造成引弧的困难。不同型号的焊 First, the issue raised At present, the domestic submerged arc welding machines are used in the following way arc: Short wire - start (to power, wire pumping) - arc - wire sent - welding. From this mode, it can be seen that in the moment of starting the arc, the wire feeding motor has a reversal process. In order to guide the arc smooth and reliable, I hope this process should be appropriate, too long and too short will lead to nail wire and welding nails, resulting in arc ignition difficulties. Different types of welding