Without seeing exactly what you are trying to do, I hazard to give input. However, surf for "solder inlay" and you will find this technic. Although molten solder is the standard in this inlay technic, one could use solid solder. One way to achieve inlay directly into wood would be to chase (carve) your figure with a slight undercut, inlay your slighly oversized solder strip, and work the solder flush to the wood. If reading urges you onward, try doing this on some scraps first, to gain your hand. Good success!