The purpose of this work is to extend the use of full field measurements (kinematical and thermal) to the identification of the high cycle fatigue properties of seam weld joints. A self-heating test under cyclic loading is carried out on a seam weld joint. During the test, displacement and temperature fields of the specimen are measured by Stereo Digital Image Correlation (SDIC) and Infra-red (IR), respectively. Then a suitable numerical strategy is proposed to identify a given thermal source model. Thus, a correlation between the change of the seam weld dissipative source and the expected mean fatigue strength of the assembly is successfully recovered.