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The last years have seen the development of a new generation of industrial interestingmechanical joining techniques for thin sheets such as self piercing riveting, clinching,friction stir welding and laser welding. The present work concentrates on fatigue behaviourof joints obtained by clinching, a cold welding technology for thin sheets which is quicklydeveloping in automobile, electronic and white goods industries, even if mainly in terms ofstatic properties. The activity firstly dealt with fatigue tests and fractographic observationswhich evidenced different failure modes at different stress ratios. Results were thensupported by FEM analyses of the clinched joints.