高周波加熱真空圧延接合Al/SUS STJの強度(その1) : 十字隅肉溶接継手の強度

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Tanks of a spherical tank type LNG carrier are supported by the cylindrical shells by the name of "skirt". On the one hand aluminum (Al) alloy (A5083) having good low temperature properties is used for the upper part of this skirt, on the other hand stainless steel (SUS) having low thermal conductivity is used for the lower part. In this case, because Al and SUS are not able to be welded directly, therefore Al/SUS STJ (S__-tructural T__-ransition J__-oint) is used to connect these two kinds of materials (Al and SUS). Until now, a four-layers [Al/Ti/Ni/SUS] clad material produced by the explosive welding method is used for LNG carrier. Recently, at Nagasaki Research & Development Center, Mitsubishi Heavy Industries, Ltd., the vacuum roll bonding method for producing a new-type Al/SUS STJ industrially is developed and investigated instead of the explosive welding method. In this paper, in order to quantify the fracture strength of this new-type Al/SUS STJ produced by the vacuum roll bonding method, a series of round bar tension tests and cruciform welded joint tension tests were performed by using the three kinds of STJ produced under the three conditions. As a result of the investigations described above, the following conclusions were obtained: (1) The faying surfaces of all three kinds of Al/SUS STJ used for the tests have almost equal strength as the tensile strength of Al alloy (R.T.: about 110N/mm^2, -165℃: about 150N/mm^2). (2) The faying surfaces of all three kinds of Al/SUS STJ used for the tests have the about 3.8 times strength safety factor at -165℃ compared with the overestimated design stress for the skirt of the spherical tank type LNG carrier. (3) All three kinds of Al/SUS STJ used for tests are certified to be practicable for the tank skirt part of a spherical tank type LNG carrier from the viewpoint of the fracture strength.
社団法人日本船舶海洋工学会の論文
2001-08-31

高周波加熱真空圧延接合Al/SUS STJの強度(その1) : 十字隅肉溶接継手の強度

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