In this study, GMAW and CMT welding technologies were evaluated in terms of their technological lifecycles based on their patent datasets together with the S-curve concept, and the joints were evaluated in terms of their welding characteristics. To predict the future trends for both technologies, different models based on the time-series and growth-curve methods were tested. From a process point of view, the results showed better performance and stability for the CMT process based on the heat input to the base material and the frequency of the short circuits. The temperature distribution in the sample revealed that the GMAW process delivers higher values and, consequently, greater heat transfer. Regarding the technological lifecycle, the analyses revealed that the CMT welding process, despite being recent, is already in its mature phase. Moreover, the GMAW welding process is positioned in the growth phase on the S-curve, indicating a possibility of advancement. The main findings indicated that through mathematical modelling, it is possible to predict, in a precise way, the inflection points and the maturity phases of each technology and chart their trends with expert opinions. The new perspectives for analysing maturity levels and welding characteristics presented herein will be essential for a broaden decision-making market process.

The use of Superduplex Stainless Steel, on Oil & Gas productive process equipment and piping, meet the requirements of high corrosion resistance, due to their high PREN (Pitting Resistance Equivalent Number), and excellent mechanical properties. However, these steels, because of the high alloy addition, can suffer loss of corrosion resistance and embrittlement when subjected to localized heating. This occurs due to the unbalance of the ferrite a d auste ite phases; for atio of deleterious phases -"ig a σ , Chi χ , se o dar auste ite 2 and precipitates of Chromium Nitrides (Cr2N). In this context, the objective of this paper was to analyze the welding process on a UNS S32760 Superduplex steel specimen, subjected to the arc heat of GTAW process. The specimen was produced with the heat input of 1.116J/mm. The samples were analyzed by optical microscopy and scanning electron microscopy (SEM), before and after the corrosion testaccording the method A of ASTM G48 Standard. Also, a micro hardiness test was performed to determine the changes on localized mechanical behavior, due to microstructural changes. The study determined: (a) the percentage of each phase present in the sample -before process; (b) the Vickers hardness profile -after welded; (c) the possible precipitation of deleterious phases, it is associated with de chemical composition of the alloy; (d) the zones and phases preferably attacked on corrosion test; and (e) Pitting morphology.