精选优质文档-倾情为你奉上电弧焊基础（Arc welding foundation）A, 1 in the cathode conductive characteristics of cathode functions: accept positive ions and emission cathode electronic institutions: the thermionic emission of cathode surface, field emission, thermal ionization collision local plasma emission cathode. Hot cathode (tungsten, carbon, etc.) : hot emission cold cathode (iron, aluminum, etc.) : electric field emission collision emission plasma caused the thermal power to leave.The electric con
