What is the difference between active and passive welding helmet?
主动式和被动式电焊帽有什么区别？
A passive welding filter does not change its transparency. An active welding filter (Automatic Darkening Filter ADF) recognizes when the arc ignites and changes to a dark state so quickly that the human eye cannot see or feel it.
被动焊接滤光片不会改变透明度。主动焊接滤光片（自动变暗滤光片 ADF）可识别电弧点燃的时点，并快速切换到暗色状态以使人眼无法看到或感觉到它。