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近年来国内外铸焊结构件的应用日益广泛,在石油输送管道上(钢板焊成)焊接短接管(铸件)就是这方而的一种尝试。大连光明化工研究所最近研究利用液氮来封冻局部石油管道的技术获得成功。在这一技术中要求在16Mn的石油管道上焊接铬镍不锈钢板制做的短接管,在液氮温度下工作,aK值不
In recent years, cast castings at home and abroad increasingly widespread application of components in the oil pipeline (welding steel plate) short tube (castings) is an attempt to this end. Dalian Institute of Light Chemical recently studied the use of liquid nitrogen to freeze the local oil pipeline technology success. In this technique, it is required to weld short pipe made of chrome-nickel stainless steel plate to 16Mn oil pipeline and work at liquid nitrogen temperature, aK value is not