In this paper, the parameter optimization of hybrid-tandem gas metal arc welding (GMAW) process was studied. The GMAW uses an additional filler-wire with opposite polarity in contrast to conventional tandem process. process, more parameters and relationship between causing strong nonlinearity should be considered. analysis variance-based Gaussian regression (ANOVA-GPR) method implemented constr...

The desire to generate a stress optimised structural node with maximum stability is often coupled the goal of low manufacturing costs and an adapted minimal use material. complex, three-dimensional free-form structures, which are created by means topology-optimisation, only partially suitable for conventional manufacturing. wire arc additive (WAAM), welding processes, offer cost-effective flexi...

A nondestructive study of the internal structure and compositional gradient of dissimilar metal-alloy welds through energy-resolved neutron imaging is described in this paper. The ability of neutrons to penetrate thick metal objects (up to several cm) provides a unique possibility to examine samples which are opaque to other conventional techniques. The presence of Bragg edges in the measured n...

The objective of this laboratory study was to identify and measure manganese (Mn) fractions in chamber-generated welding fumes (WF) and to evaluate and compare the results from a sequential extraction procedure for Mn fractions with that of an acid digestion procedure for measurement of total, elemental Mn. To prepare Mn-containing particulate matter from representative welding processes, a wel...

Grain growth and hardness variation occurring in high-temperature heat affected zone (HAZ) during the welding processes are two thermal dependant aspects of great interest for both academic industrial research activities. This paper presents an innovative finite element (FE) model capable to describe grain decrease that occur gas metal arc (GMAW) commercial AISI 441 steel. The FE software SFTC ...