I use the Lee Valley kit to weld bandsaw blades. It's simple and quick, but you have to be careful to keep all surfaces flush. Basically, you grind a bevel on both ends of the band (about 3/16") and then clamp them in the jig making sure that the back of the band is in alignment. If the bevel faces aren't pressing against each other then you have to put a bit of a bend in one side or the other. Put flux of both faces then cut off a small piece of silver solder using scissors. Put the solder between the two bevel faces and once more check that everything is in alignment. Using a MAPP torch, heat the joint until red then quench with a damp towel. Use a file or sandpaper to true up any irregularities on the back and the two faces. Make sure the band is right way around and put back in saw.