Abstract: The influence of iron powder/feldspar on the arc stability, average particle size, Cr (Ⅵ) content and Cr(Ⅵ)/total Cr(n/N)were investigated by hanover arc analyzer, high-speed cameras and laser particle sizer. The experimental results showed that average particle size of welding fume inshort circuit transfer is smaller than the granular transfer;The proportion of Cr(Ⅵ)/total Cr(n/N) is low in welding fume of short circuit transition.Under the same welding parameters, welding fumes average particle size is up to 1154 nm, Cr (Ⅵ) and Cr (Ⅵ)/total Cr are 24% and 1555.8 mg/kg respectively when iron powder/feldspar is around 1.8, under which the shortest short transition time is 1033μs.