The cracking behavior in single crystal nickel-based superalloy welds was studied. A laser powder deposition process was used with Rene N5 base metal and three different filler metal alloys: IN625, IN738 and MarM247. Two different welding configurations were examined. In the first, a clad layer was deposited on the surface of the base metal. In the second, a U-groove was machined and filled with one of the filler metals. The paper details the extent of cracking as a function of filler metal alloy and weld geometry. Cracking was minimal in the clad geometry but was significant in the U-groove geometry. Cracking was worst with the MarM247 filler metal. Cracking was along stray grain high-angle boundaries and metallography revealed a one-to-one correlation between the extent of cracking and the propensity to form stray grains.