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Abstract
For conserving the earth's environment through the reduction of energy consumption in the field of transport machinery, reduction in weight is necessary and hence the application of light materials to structural members has been investigated. For the most representative example of transport machinery, it is highly likely that a variety of aluminium materials will be used for automobile bodies. However, since iron and steel materials are still used for the main part of the structure that requires high strength, joining of dissimilar metals, i.e. aluminium and iron and steel materials, is the new technical task in terms of reducing weight.
