Abstract
In order to estimate the ultimate strength of double strapped end, side and combined fillet welded joints, a series of experiments was performed in ten counties by the schedule of I. I. W. The test results have been analysed purely by I. I. W., but, in this paper, the results, supplemented by of another experiments performed by the authors, are analysed theoretically (on the basis of theory which was made public formerly : the ultimate strength of end fillet welded joints equals to 1.46A_1 σ_c/√<3>-by A_1 it means throat area and σ_c tensile strength of weld metal). And some considerations are given to the problems which difficult the estimate of the ultimate strength of fillet welded joints.
