In the recently developed hybrid welding process, a laser and an electric arc are coupled in order to combine the positive aspects of each technology: high speed, low thermal load and high seam depth, all typical features of the laser; low cost and ability to withstand poor edge preparation, typical of the MIG arc welding. In particular the laser Nd:Yag-GMAW welding has been widely studied for thin sheet welding in the automotive industry. On the other hand the CO2 laser-MIG welding, which is nowadays one of the most promising solutions for optimum power/cost ratios, has significant advantages on the Nd:Yag-GMAW in welding of thick sheets, where high power sources are required. This paper investigates the stability condition of an hybrid CO2-GMAW welding process, by analysing the influence of several process parameters. A preliminary set of experiments was carried out in order to determine the optimal position of the two sources. A second set of experiments allowed to investigate the importance of the filler metal transfer mode on the stability of the whole process. The obtained specimens are I-butt joints of AISI 304 stainless steel sheet of high thickness. The depths, widths and quality of the weld beads have been analysed by means of a statistical approach and related to process parameters.
G. Campana, A. Fortunato, A. Ascari, G. Tani, L. Tomesani (2007). The influence of arc transfer mode in hybrid Laser-MIG welding. JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 191(1-3), 111-113 [10.1016/j.jmatprotec.2007.03.001].
The influence of arc transfer mode in hybrid Laser-MIG welding
CAMPANA, GIAMPAOLO;FORTUNATO, ALESSANDRO;ASCARI, ALESSANDRO;TANI, GIOVANNI;TOMESANI, LUCA
2007
Abstract
In the recently developed hybrid welding process, a laser and an electric arc are coupled in order to combine the positive aspects of each technology: high speed, low thermal load and high seam depth, all typical features of the laser; low cost and ability to withstand poor edge preparation, typical of the MIG arc welding. In particular the laser Nd:Yag-GMAW welding has been widely studied for thin sheet welding in the automotive industry. On the other hand the CO2 laser-MIG welding, which is nowadays one of the most promising solutions for optimum power/cost ratios, has significant advantages on the Nd:Yag-GMAW in welding of thick sheets, where high power sources are required. This paper investigates the stability condition of an hybrid CO2-GMAW welding process, by analysing the influence of several process parameters. A preliminary set of experiments was carried out in order to determine the optimal position of the two sources. A second set of experiments allowed to investigate the importance of the filler metal transfer mode on the stability of the whole process. The obtained specimens are I-butt joints of AISI 304 stainless steel sheet of high thickness. The depths, widths and quality of the weld beads have been analysed by means of a statistical approach and related to process parameters.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
