Yog hais tias muaj oxides los yog av nyob rau saum npoo ntawm lub workpiece thiab electrode ntawm qhov nruab nrab zaus qhov chaw vuam tshuab, nws yuav ncaj qha cuam tshuam rau kev sib cuag.Kev tiv thaiv kuj tseem cuam tshuam los ntawm electrode siab, vuam tam sim no, tam sim no ceev, vuam lub sij hawm, electrode zoo, ...
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