Analysis of Favorable Process Conditions for the Manufacturing of Thin-Wall Pieces of Mild Steel Obtained by Wire and Arc Additive Manufacturing (WAAM)

Materials

Ángel Yanguas-Gil¹  Cinta Lorenzo-Martín¹  JoséLuis Diéguez²  JoséLuis Prado-Cerqueira³  Álvaro Rodríguez-Prieto³  AnaMaría Aragón³  AnaMaría Camacho³ 

[1] Applied Materials Division, Argonne National Laboratory, 9700 Cass Ave, Lemont, IL 60439, USA;Department of Design in Engineering, University of Vigo, C/Torrecedeira 86, 36208 Vigo (Pontevedra), Spain;Department of Manufacturing Engineering, Universidad Nacional de Educación a Distancia (UNED), 28040 Madrid, Spain;

关键词: additive manufacturing;    WAAM;    GMAW;    cold metal transfer;    hardness;    mechanical properties;    thermal input;    microstructure;   

DOI  :  10.3390/ma11081449

来源: DOAJ

【 摘 要 】

One of the challenges in additive manufacturing (AM) of metallic materials is to obtain workpieces free of defects with excellent physical, mechanical, and metallurgical properties. In wire and arc additive manufacturing (WAAM) the influences of process conditions on thermal history, microstructure and resultant mechanical and surface properties of parts must be analyzed. In this work, 3D metallic parts of mild steel wire (American Welding Society-AWS ER70S-6) are built with a WAAM process by depositing layers of material on a substrate of a S235 JR steel sheet of 3 mm thickness under different process conditions, using as welding process the gas metal arc welding (GMAW) with cold metal transfer (CMT) technology, combined with a positioning system such as a computer numerical controlled (CNC) milling machine. Considering the hardness profiles, the estimated ultimate tensile strengths (UTS) derived from the hardness measurements and the microstructure findings, it can be concluded that the most favorable process conditions are the ones provided by CMT, with homogeneous hardness profiles, good mechanical strengths in accordance to conditions defined by standard, and without formation of a decohesionated external layer; CMT Continuous is the optimal option as the mechanical properties are better than single CMT.

【 授权许可】

Unknown