More metal questions.

I'm trying to get my head around the ditial printing in metal. In my november 22 post I have shown two videos. The second one though it says shapeways is exones process. I posted the first one because it helped to clarify things for me though I was told the first video is not really how they create their bronzes. Ex one tells me their bronze is Our bronze is 90% copper and 10% tin. I have been talking with them about collaboration on the book and project. This is something I received from the production company at ex one 60% stainless steel
40% Bronze

"We print in a bed of stainless steel powder layer after layer until the three-dimensional part is done. We cure that bed of powder and then we take bronze powder and wick it into the bronze metal. How this happens is as follows. The design that was printed has a stilt as we call it (nothing more than an appendage sticking out of the part). This is added before we print in the stl file. When we set up the furnace we take that stilt and touch the bronze powder to it. At a certain temperature in the furnace the bronze powder starts to melt. When that happens the bronze capillaries into the stainless steel. If you would look at the stainless steel object before the bronze in infiltrated it would look like your kitchen sponge. A sponge has holes all over it. Same principle for the stainless steel part. So in order to fill those holes we use the bronze which is a lower temperature metal to fill the voids. This is how it becomes a composite."

My question would be this. HOw would this weld together? If you printed in pieces and welded it together could this be seamless? would the welds show over time? ( this is a horrible thing concerning a fine art bronze) I wish I knew a metalurgist who could look at an ex one piece and compare it to the Everdur bronze. I'm also curious how this "printed metal" will handle the outdoors.