Thanks to the development of different materials (in type and grade) and due to a matter of optimizing the selection of materials (in properties and costs), the concept of dissimilar welding arises, which is associated with welds between different steels. The objective of this work is to study the microstructure and mechanical properties of dissimilar welds between plates of austenitic stainless steels (AISI 304L), lean duplex (LDX 2101) and duplex (DX 2205), by using the semiautomatic process with protection inert gas and double pulsed arc, using as filler material a solid duplex stainless steel wire. For this purpose, three welding coupons (A-L; AD ; L-D) with double pulsed arc were welded and cross sections were made for chemical and microstructural characterization, using optical emission spectrometry, light microscopy and scanning electron microscopy, respectively. For mechanical characterization, hardness sweeps were performed on the cross sections, and tensile specimens were mechanized and tested at room temperature. The obtained mechanical results show a significant decrease in the hardness in the heat-affected zone of the austenitic steel and a greater tensile strength in the dissimilar weld between L-D.
Super duplex stainless steels have a dual structure with 50% ferrite and austenite. With this phase balance, the best mechanical properties and corrosion resistance are used. Thanks to these characteristics, their employment is growing, fundamentally, in the paper, chemical, gas and oil industries. overlay welding, or cladding, is associated with the deposition of material on the surface and is commonly used for manufacturing and equipment repair. The properties of the overlay weld depend on the chemical composition and the microstructure, which depends on the welding procedure. Therefore, in overlay welding with super duplex stainless steels, the control of the phases present in the microstructure is essential to protect the required properties. The objective of this work was to study the effect of the heat input (high, medium and low) and the number of layers (one and two) of the super duplex stainless steel weld deposit on the chemical composition, microstructure, hardness and corrosion resistance. For this purpose, six overlay weld coupons were welded by means of the semi-automatic electric arc welding process with gas protection: 1 and 2 layers welded with low, medium and high heat input (modifying the welding speeds). On them, the macro and microstructure were characterized, the geometric and chemical dilution were determined, the microstructure was determined by light microscopy, scanning electron microscopy and X-ray diffraction, and the Vickers microhardness was determined.
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