Abstract: The major shape measurements of butt welded joints are measured It is obtained by statistical analvsis taht the statistical distribution of weld toe angle,weld width,weld reinforce-ment and weld misalignment is nonnal and that of radius at the weld toe is logarithm nonnal.It is also found that the distribution of weld reinforeement and misalignment is Weibull.The stress concentration factor Kt at the weld toe is calculated.

Key words: welded joints, statistical distribution, stress concentration, coefficients