A welding assembly for forming a weld along a welding interface of a work piece using vibrations includes a welding tool and a thermal barrier. In various embodiments, the neutral chemical reagent belongs to the class of organic chemical species containing a disulfide functionality. Each conductive apparatus includes a tank fitted about the supporting pole, conductive liquid received in the tank, first cables, and a second cable. In the above specified timing, the heater is switched from OFF to ON.