Last year I got a soldering iron for Christmas last year and it has been a pain ever since I got it. However I don't know whether it's the solder, soldering iron or me that's at fault. The iron is a very basic one for beginners. It's 40W and has a temperature range of 420 to 460 degrees. So it should be hot enough for the job of soldering electronics components to a board. However when I try to tin the tip the solder melts but runs off the tip instead of sticking. If I hold the soldering iron against the terminal pins then hold the solder against the pin the solder doesn't melt. I don't know why this is but I am guessing that it's because I can't properly tin the tip. I don't know whether the solder I am currently using contains flux, if it doesn't then that might explain why I can't tin the tip with it. Any ideas what the problem might be? Below is a picture of the soldering iron I'm talking about.