Microstructural analysis of AISI 304 bars welded with high speed pulsed discharges

Characterization of aeronautical engine parts welded with capacitor discharge welding technology

“…In Table 1 the best AISI joint welding parameters are reported as reference values; the optimum configuration resulted with two successive discharges under a force of 17 kN, established on the basis of visible weld morphology and static resistance results [6][7][8][9]. Table 1 The best welded AISI mock-up…”

“…3) bears electro-magnetic forces and components deformations; a hydraulic system ensures compressive forces to perfectly hold the parts during welding. Large batteries (8320 µF with 3000 V circuits) are connected to the discharging lines through pulse transformers for the secondary welding circuit working at 10-15 V [6][7][8].…”

“…This work is part of a European research program involving the authors and aeronautical industries, aimed to use CDW methods for repair applications [6][7][8][9][10][11][12][13][14][15][16].…”

“…CDW technology has been applied so far to realize circular butt welds up to 6 mm in diameter [3][4][5]; the authors recently explored the possibility of joining larger surfaces up to 12 mm in diameter in AISI 304 steel [6][7][8][9], Ti 6 Al 4 V, and Inconel 718 materials [10][11][12].…”

“…In this article, welded joints in the form of shaped mock-ups are presented; the welds are achieved with different combinations of welding parameters, on the basis of previous experimentations [6][7][8][9][10][11][12]. The chosen materials are the α/β titanium alloy Ti 6 Al 4 V and Inconel 718 nickel super-alloy, widely used for aeronautical compressors and turbine blades [17].…”