Americo Scotti

A contribution to the study of negative polarity in GMA welding

GMAW using the electrode with negative polarity (DCEN) has been frequently suggested as a potential means of increasing production capacity. The...

A critical analysis of weld heat input measurement through a water-cooled stationary anode calorimeter

A comprehensive model on heat transfer in welded plates is able to calculate the amount of heat losses from the surfaces. A model demands as input...

A critical analysis of weld heat input measurement through a water-cooled stationary anode calorimeter

Comprehensive models of heat transfer require specification of the total amount of heat received by the workpiece. The objective of this work was t...

A Methodology to Parameterize Wire + Arc Additive Manufacturing : A Case Study for Wall Quality Analysis

The objective of this work was the development of a methodology to parametrize wire + arc additive manufacturing (WAAM), aiming dimension...

Active power measurement in arc welding and its role in heat transfer to the plate

A contemporary paper claimed that a method using the resistance of impedance (active power) for arc power calculation is more accurate than the...

Analysis of residual stresses resulting from the surface preparation for X-ray diffraction measurement

There is no consensus in the literature on the need to remove preprocessing layers from the material prior to the measurement of residual stresses ...

Appraisal of fiber-metal laminate panels reinforced with metal pins deposited by CMT welding

Avaliação da Aplicação de um Atlas de Soldagem de um Aço Bainítico Microligado ao Nióbio : Application Assessment of a Welding Atlas of a Niobium Microalloyed Bainitic Steel

Os aços de alta resistência microligados ao nióbio têm mostrado ser uma boa opção para fabricação de perfis estruturais, utilizando os conceitos já...

Balancing WAAM Production Costs and Wall Surface Quality through Parameter Selection : A Case Study of an Al-Mg5 Alloy Multilayer-Non-Oscillated Single Pass Wall

The purpose of the study was to propose a strategy to assess the potential reduction of the production cost during wire+arc additive manufacturing...

Comparison of methods to correlate input parameters with depth of penetration in LASER welding

Despite the industrial relevance of LASER welding, determination of sustainable parameterization is still a challenge. Trial and error, or even not...

Concept and validation of an active cooling technique to mitigate heat accumulation in WAAM

This work aimed at introducing and exploring the potential of a thermal management technique, named as near-immersion active cooling (NIAC), to...

Concept of a Novel Path Planning Strategy for Wire + Arc Additive Manufacturing of Bulky Parts : Pixel

An innovative trajectory strategy was proposed and accessed for wire arc additive manufacturing (WAAM), applicable to different and more complex...

Development and Evaluation of Wire Feeding Pulsing Techniques for Arc Welding : Desenvolvimento e Avaliação de Técnicas para Pulsação da Alimentação de Arame em Soldagem a Arco

Applying pulsed wire feeding techniques is one of the new approaches for welding, such as for GTAW and GMAW. However, these techniques invariably...

Development and implementation of a software for wire arc additive manufacturing preprocessing planning : trajectory planning and machine code generation

To overcome a shortage of flexible and low-cost solutions for wire arc additive manufacturing (WAAM) preprocessing, this work´s objective was to...

Effect of O2 content in argon-based shielding gas on arc wandering in WAAM of aluminum thin walls

The present work aimed at evaluating the effect of O2 content in argon-based shielding gases over the arc cathodic emission behavior (which can lea...

Effect of the CMT advanced process combined with an active cooling technique on macro and microstructural aspects of aluminum WAAM

Purpose: This paper aims to assess the combined effect of the Cold Metal Transfer (CMT) advanced process and of a thermal management technique (nea...

Effect of thermal management approaches on geometry and productivity of thin-walled structures of er 5356 built by wire + arc additive manufacturing

The present paper aimed at assessing the effect of two thermal management approaches on geometry and productivity of thin-walled structures built b...

Exploring a locus of maximum metal transfer stability of the short-circuiting GMAW process based on the reignition voltage peaks

The welding process stability is a critical factor regarding the quality of the manufactured products in the Industry. There are two approaches to...

Exploring the use of switchback for mitigating homoepitaxial unidirectional grain growth and porosity in WAAM of aluminium alloys

In this work, an alternative approach to prevent unidirectional grain growth in wire + arc additive manufacturing (WAAM) is proposed and assessed, ...

Fiber-metal laminate panels reinforced with metal pins

Fiber-metal laminates (FMLs) are key to modern composite structures and metal-compositecoupling is crucial to improve their effectiveness. Cold-met...

Flux for Hardfacing by Submerged Arc Welding from Ferrochrome-manganese and Slag from the Simultaneous Reduction of Chromite and Pyrolusite

The obtaining of a flux for hardfacing by Submerged Arc Welding (SAW), using ferrochrome-manganese and slag obtained from the simultaneous...

Inaccuracy in arc power calculation through a product of voltage and current averages

Power is an indirect measurand, determined by processing voltage and current analogue signals through calculations. Using arc welding as a case...

Influence of the CO2 Content on Operational Performance of Short-Circuit GMAW

CO2 blended with Ar is the most common shielding gas used for short-circuit GMAW. There has been some technical knowledge devised from the process...

Operational behavior of the switchback GMAW process using a mechanized rig for arc movement

Switchback Gas Metal Arc Welding (GMAW) consists of a forward and backward periodic oscillation of the welding torch in the longitudinal direction ...

Pyrometrical Interlayer Temperature Measurement in WAAM of Thin Wall : Strategies, Limitations and Functionality

Significant efforts have been spent determining or monitoring interlayer temperatures (IT) to increase quality in Wire Arc Additive Manufacturing...

Residual Stresses in Arc Welding : A Holistic Vision

There are several examples in current literature where assumptions regarding residual stresses are made, yet rarely confirmed in practice. To...

The effect of pulsed cold-wire feeding on the performanceof spray GMAW

The application of pulsed cold-wire (P-CW) feeding has been one of the new approaches for arc welding over the past years. Such technique applied t...

The potential of wire feed pulsation to influence factors that govern weld penetration in GMA welding

Derivative welding processes are in many cases capable of altering phenomena that determine fundamental aspects of weld bead formation. Some of the...

Thermal management in WAAM through the CMT Advanced process and an active cooling technique

Thermal management is a key factor in wire + arc additive manufacturing (WAAM) in order to mitigate heat accumulation and cope with limitations...

Transferability of the working envelope approach for parameter selection and optimization in thin wall WAAM

This work aims to propose and assess a methodology for parameterization for WAAM of thin walls based on a previously existing working envelope buil...

Understanding the behavior of laser surface remelting after directed energy deposition additive manufacturing through comparing the use of iron and Inconel powders

Laser directed energy deposition with powder (pDED-L) is one of the most popular techniques for additive manufacturing. However, for some...

University-industry collaboration in curriculum design and delivery : A model and its application in manufacturing engineering courses

The advantages and importance of university-industry collaboration, particularly in curriculum design and delivery, are well-known. However, althou...

Welding in the world-update 2021

Welding thermal stress diagrams as a means of assessing material proneness to residual stresses

In this work, the proposal and appraisal of a method to describe in a quantitative manner the phenomenon of thermal stresses formation in welding a...

Wire feed pulsation as a means of inducing surface tension metal transfer in Gas Metal Arc Welding

Gas Metal Arc Welding (GMAW) derivative processes have gained attention due to their capacity to perform specific functions, such as reducing...

Work Envelope Expansion and Parametric Optimization in WAAM with Relative Density and Surface Aspect as Quality Constraints : The Case of Al5Mg Thin Walls with Active Cooling

The successful and efficient production of parts with specific features by Wire + Arc Additive Manufacturing (WAAM) strongly depends on the selecti...