請(qǐng)各位高手指點(diǎn)：
我現(xiàn)在有一臺(tái)成都東電建設(shè)電氣有限公司的逆變焊接電源（型號(hào)：NB-500I）一臺(tái)，問題如下：焊機(jī)打開時(shí)電流電壓可調(diào)整，焊接時(shí)候焊絲不能融化只是有小點(diǎn)火花焊絲成卷，電壓表由36V直降6.5V.哪位高手幫我指點(diǎn)下謝謝?。。。?！
焊絲不融化
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