High-power laser welding of austenitic stainless steel with electromagnetic control of weld pool

PA position full penetration high power laser beam welding of up to 30 mm thick AlMg3 plates using electromagnetic weld pool support

“…For a better understanding of the magnetohydrodynamical phenomena in the weld pool, we have performed computer simulations of the process 14. These simulations show that the ac magnetic field can drastically reduce the width of the lower region of the weld pool.…”

High-power laser beam welding for thick section steels – new perspectives using electromagnetic systems

“…A schematic drawing, as well as the basic working principles of this electromagnetic weld assistance system, can be found in [12]. The balancing of the hydrostatic pressure with the magnet mounted below the weld root was demonstrated in [12][13][14] for aluminium alloys, [15][16][17] for austenitic stainless steels, and [18,19] for duplex stainless steels with ferromagnetic properties. The first results for ferritic steels were published in [20][21][22][23][24][25], where typical structural steels and pipeline steels were welded.…”

“…Similar simplified models are in the same way well suited if one is interested in evaluating the resulting pressure differences in the weld bead during the application of electromagnetic fields as an inductive weld support system for a given magnetic flux density applied or to limit the parameter window for such application. This was done for non-ferrous alloys in [13,14], for austenitic stainless steel without or weak ferromagnetic properties in [15][16][17], and for duplex stainless steel in [19] discussing different simulation techniques to include an electromagnetic flow control in laser beam welding at the same time. In the same way, similar numerical models were exploited for (1) the evaluation of trends of a possible flow altering, e.g.…”