Effect of Coat on Droplet Transfer of Solid Wire by Gas Shielded Arc Welding
The coat predominantly consisted of Na,K and Ti oxidation film prepared on the solid wire by nano-coat technology.The droplet transfer of uncoated solid wire and coated solid wire were investigated by analysator Hannover and high speed camera.It is found that the method of droplet transfer of two kinds of solid wire is most of spray transfer with a little of short-circuit droplet transfer when current is 260 A and voltage is 30 V.According to statistics,the frequency of droplet transfer of uncoated solid wire is about 250 drops per second,in them,the frequency of short-circuit droplet transfer is 13 drops per second.The frequency of droplet transfer of coated solid wire is about 280 drops per second,in them,the frequency of short-circuit droplet transfer is 0.5 drops per second.The arc of the two kinds of solid wire is both fluctuating during droplet transfer,but the arc of the coated solid wire is more stable.In addition,the width of arc column of uncoated solid wire is much wider.