... of hot expansion or hot smelting, for instances, embedded welding of copper core of computer radiator with aluminum sheet ... hardware molds, such as small-size mold, mold accessory and inner hole of mold.C. Welding (braze welding, silver soldering and brazing)It mainly ... cutter, reamer, planning tool and solid center bit. 2. Welding of various hardware mechanical gadget: Silver soldering and brazing of ...