Fuyang ductile iron water pipe _ ductile iron pipe water supply ductile pipe prices _ Shunxiang provided by Shunxiang ductile pipe. Liaocheng Shunxiang Building Materials Co., Ltd. (www.lcsxjc.com) Shandong Liaocheng Premium Business League certification company, has Shunxiang other brands, has a good reputation, honesty, service-oriented "business alliance Service" icon on the page We will be happy to serve you! Building Materials Co., Ltd. mainly produces Liaocheng Shunxiang variety of milling of cast iron, ductile iron pipe, cast iron pipe fittings of high quality flexible water supply ductile iron pipe fittings price, cast iron pit wells quality of our products. Due to the different circumstances of each point in the vicinity of the heat pipe flexible expansion joints weld heat-affected zone can be divided into the fusion zone and overheated zone, normalizing area and part of phase transition zones. Flexible expansion joints of pipe weld fusion zone and base metals is handover transition zone between the solidus and liquidus temperatures in this area, as part of the welding process, the temperature of the base metal melting ductile iron water pipe fittings manufacturer, so also known as semi-melted zone. At this point, to melt the metal solidified into cast structure for molten metal heating temperature is too high because of overheating coarse grain formation in low-carbon steel double flanged Transmission Joint welding, pipe welding area although small flexible expansion joints (0.1-1mm) but because of its strength and toughness are decreased, and the connector end face of the changes here, can lead to stress concentration, so the fusion zone determines the properties of welded joints in a great extent. Building Materials Co., Ltd. mainly produces Liaocheng Shunxiang variety of milling of cast iron, ductile iron pipe, cast iron pipe fittings of high quality flexible water supply ductile iron pipe fittings specifications, cast iron pit wells quality of our products. Flexible expansion joints pipeline inspection standards before leaving the factory: 1, flexible pipe expansion joints to be done before leaving the factory hydrostatic test and comprehensive test, the test pressure is 1.5 times the nominal pressure, pressure 20 minutes without leakage is qualified. 2, the flexible pipe expansion joints hydrostatic test shall notify the tender side to witness the scene, after passing the factory. 3, the inner and outer walls of the pipe are flexible expansion joints should be corrosion paint brush in water quality to adapt to the requirements.