Résumé
In this communication, two specimens are studied upon which a filler-wire is melted and deposited under electric arc heating. The process of interest is called wire and arc additive manufacturing. Such process produces mechanical parts with high tensile stresses and important geometrical distortions. The focuse is made on the residual stresses in the specimen. The effect of each deposited layer on the residual stresses is investigated with the neutron diffraction technique. The highest longitudinal stress values are measured under and at the parent-deposit surface where occurs the highest heating and cooling phases. The deposition of the 2 nd layer has reduced the tensile longitudinal stress values of 60 MPa. The thermal cycle due to the deposition of the 2 nd layer likely acted as a partial heat treatment of the previous melted and heat affected zones. A 2D stress map has been done from the one layer specimen lots of nuetron diffraction have been done. This 2D stress map shows that the inner part of the specimen is under compressive stress while the deposits are under tensile stress with a stress peak located near the parent-deposit interface. The longitudinal stress decreased from this peak till the top surface of the last deposit.