We report a novel joint fabrication method for YBa2Cu3O7-x (Y123) bulk superconductors without pressure loading, based on a well-controlled high-temperature process. Due to the direction of the heat fluxes in a box furnace, the surfaces of the joined samples melt first, and the crystal morphology of the original YBa2Cu3O7-x bulks remains. After the joining process, part of the texture zone is used as a seed to grow new texture crystals for nucleation during cooling. Finally, a high-quality artificial grain boundary forms without acting as a weak link, which is supported by the trapped field distribution. Details of the joint are presented, including its microstructure and micro-orientation. Moreover, the trapped field values at 65 and 45 K are presented.