<p>The purpose of this study is to develop a simulation method to predict leak limit tensile strain from weld flaws in girth-welded high-pressure pipe subjected to uniaxial tension. Tensile tests are conducted using a girth-welded joint of pipe with artificially introduced notches at the weld metal or heat-affected zone. Regardless of the internal pressure level, a notch located in the weld metal on the inner surface of the pipe is the most susceptible to leaks. Material properties of each area are measured by experiments using proposed small-size specimens that could be extracted from narrow areas such as the weld metal and heat-affected zone. Ductile crack growth simulation is conducted using FE models of girth-welded pipe to which the measured material properties are assigned. It is demonstrated that the simulation method is applicable to predict the notch location most susceptible to leaks and the leak limit tensile strain of the girth-welded pipe.</p>