化学工业生产中,很多工艺管道需要耐腐蚀性能较好的金属材料,如铜和铝等.这些管道其管线连接,一般采用焊接的方法,但设备或容器的连接,采用法兰连接。如采用焊接,出了设备的接口材质为碳素钢和不锈钢等,则形成异种材料的焊接,对焊接工艺要求较严,对焊工的操作技 In the production of chemical industry, many process pipes require metal materials with good corrosion resistance, such as copper and aluminum, etc. These pipes are usually connected by welding, but the connection of equipment or containers is flanged. Such as the use of welding, the interface material out of the device for the carbon steel and stainless steel, the formation of dissimilar materials welding, the welding process more stringent requirements on the operation of the welding technology