The aim of this work is to study the effect of the time of shot peening withsteel balls of 1. 25 mm in diameter on fatigue strength of butt joints for low carbonsteel (1020 AISI) welded by metal arc welding shielded with CO2 gas(MIG/MAG). All fatigue tests were of the rotary bending type at mean stress ofzero for welded unpeened samples and shot peened samples at various times. https://www.bekindtopets.com/