We expect that capillary-force-induced welding of metal nanoparticles would present several advantages. First, this method is free of reagent and expensive facilities. It can be performed by applying mist or simply breathing on the sample. Second, the welding is self-limited. It occurs only at the contacting areas of the particles and does not affect the other areas or the underlying layer. By contrast, methods like mechanical pressing and thermal heating affect the whole area of the material and cannot be localized. Third, theoretically this welding effect is extremely strong when two particles begin to form contact, and the effect is especially strong on nanoscales