Silicon bronze doesn't weld like steel. It doesn't weld like aluminium either. To say it welds like chewing gum is probably more accurate. It has a nasty habit of going from rock hard to a gooey mess quickly. Sadly there isn't much stuff on the net for welding cast bronze and I'm not sure why that is.... I've figured out it's easiest to weld on DC-EN with a 2% lanthanated tungsten or thoriated tungstens when using an inverter machine. I've tried green tungstens and grey tungstens and both produced erratic arcs that simply didn't work. As with any welding, heat control is critical and that means a careful touch with the foot pedal. Welding thick to thin is always a challenge and the normal dab technique is a farce with this. When you attempt to get the filler rod near the operation, it will ball up from the heat of the torch so you have to be quick to pull back the torch, get your dab on and get the heat back in there. The good thing about welding this stuff is it's really easy to grind it into shape due to it's softness. SO I needed a bronze pin that will allow a small piece of metal to swing to hold in a photo, piece of cardboard and a small sheet of glass. Here is the solution. Stacked bronze! The method is get a tiny puddle and dab. Allow a couple of seconds to cool, hit it again and repeat. The growing pin can be leaned by only heating on one side as necessary. If you use too much heat, the tower falls. The trick is to heat enough and control the depth of the puddle on the top of the pin. The oxy/acetylene guys should have learned this lesson years ago as the old farts would make students use bronze and braze up a little tree by stacking material. I essentially do the same process here to create the necessary pin. To lock the tab onto the pin, it's time to superheat the top of the pin and let it fall. Fun stuff, good exercise and can be practiced with just some bronze filler wire. Why do this? Simply because store bought trash from HD and lowes would look outta place on these little frames. Now I get to fill in some of those tiny holes. It never ends. Stacked bronze Shortened pin Melted the top of the pin.