The　Fe-Nb-C-B-Ni-WC　(30%)　iron-based　tungsten　carbide　wear　resistant　hardfacing　alloy　was　deposited　on　the　Q235　byargontungsten-arcwelding　(TIG)　using　flux-cored　wire.　The　effect　of　niobium　content　on　the　dissolution　of　tungsten　carbide　in　the　alloy　was　studied　by　changing　the　niobium　content　from　1.0%　to　3.8%.　The　results　show　that　niobium　content　has　a　great　influence　on　the　degree　of　dissolution　of　tungsten　carbide　in　the　alloy.　The　primarily　precipitated　fine　NbC　particles　around　the　tungsten　carbide　inhibit　the　dissolution　of　tungsten　carbide.　The　amount　of　fine　NbC　determines　the　intensity　of　the　inhibitory　effect　on　the　dissolution　of　tungsten　carbide.　The　alloy　with　2.5%　niobium　effectively　inhibit　the　dissolution　of　tungsten　carbide　in　the　alloy,　the　original　tungsten　carbide　particles　were　reserved　more　completely.　©　2016,　Harbin　Research　Institute　of　Welding.　All　right　reserved.