DQOK is a bathroom factory specializing in the production of brass and stainless steel shower sets. We have multi-functional Concealed Shower Suit . All products have patents, avant-garde design and unique innovation. Dingquan bathroom will be your priority Concealed Shower Suit,Concealed Shower Faucet Set,Bathroom Rain Shower Set,Brass Concealed Shower Set Heshan Dingquan Sanitary Ware Industry Co., Ltd , https://www.dqoksanitary.com
To avoid thermal stress, it must be preheated before welding. It is heated by a small electric wire of tungsten wire, the diameter of tungsten wire is 0.7mm, the tube of A12O3 is used, and the Mo piece is used as the heat-insulating reflective screen. The maximum heating voltage is 55~65V, the current is 17~20A, and the preheating temperature is 700~1800°C.
Place the preheating resistance furnace into the holder of the electron beam welder vacuum chamber. The cleaned weldment is clamped onto a movable and rotating stage with stepless speed regulation and placed in the furnace of the resistance furnace. When the degree of vacuum is <0.013 Pa and the preheating temperature is >1500 ° C, the weldment is automatically and smoothly rotated to start welding. High voltage 22kV, first use a small current 1~2A electron beam defocusing on the metal parts, otherwise it will cause micro-cracking of A12O3 porcelain parts. After about 4~5min, the electron beam is more defocused, so that it is partially on the A12O3 ceramic, and then the beam current is gradually increased by 6~10A. At this time, the electron beam power density is 6.6~11 × 105W/cm2, and the temperature is about 2000 °C, which can partially melt the ceramic and metal to form a cermet bond layer. Within 5~8s, the welding is over, and slowly Drop the beam current to zero. When cooling, the resistance furnace should also be slowly cooled to avoid cracking of the porcelain. Ceramics and ceramics can also be welded using similar processes as described above.
Process welding technology for ceramic and metal electron beam welding
Welding process for ceramic and metal electron beam welding: