Contributions of the High Frequency Dynamic Wire Feeding in the GTAW Process for Increased Robustness

Silva, Régis Henrique Gonçalves e; Silva, Rafael Gomes Nunes; Schwedersky, Mateus Barancelli; Dalpiaz, Giovani; Dutra, Jair Carlos

doi:10.1590/0104-9224/si24.30

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…Also, in Figure 12 (in frames C and D) it can be observed that after contact between the wire and the weld pool the arc anchors on the wire tip, since it would be at the same potential as the workpiece, promoting a small reduction in the arc length and, consequently, in the arc voltage. This phenomenon was also observed by Silva et al [15], Yudodibroto et al [7] and Jorge et al [16] Besides the stability of the process, the type of metal transfer also affects the weld bead. In order to evaluate the influence of the intermittent droplet transfer, the weld bead geometry was compared with that obtained with the bridge transfer mode.…”

Section: On Wire Feed Methodology and Metal Transfersupporting

confidence: 69%

“…Although the results for intermittent bridge transfer with a continuous wire feed speed showed better geometry for the root pass procedure, this transfer mode is more susceptible to electrode contamination, principally in the overhead and vertical up welding positions. Although there other techniques to avoid the electrode contaminations, such as dynamic wire feeding as suggested by Silva et al [17], for orbital welding procedures intermittent bridge metal transfer mode should be avoided, and the continuous bridge transfer mode is recommended for continuous wire feeding in GTAW.…”

Section: On Wire Feed Methodology and Metal Transfermentioning

confidence: 99%

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On Orbital GTA Root-Pass Welding: Evaluation of AVC Performance, Bevel Geometry Influence and Wire Feed Technique

2022

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Welding operations are one of the most important operations during pipeline construction and most are still carried out manually with SMAW. The challenges associated with the automation of orbital welding are related to several variables, including the weld pool behavior in vertical and overhead positions, monitoring of parameters and metal transfer, bevel preparation and orbital welding head control. In order to achieve a 360º orbital root pass with GTAW process, this study was focused on evaluating the influence of the arc voltage control (AVC) system for pulsed current process, the bevel geometry and filler wire insertion technique on the welding process and weld bead. Experiments were carried out using 16" ASTM A36 pipes with ½" wall thickness and an automated orbital welding head. The results show that the AVC control must be appropriate for the current mode applied (pulsed or constant) in order to avoid arc length oscillation. Also, the counterboring operation during the bevel preparation increases the amount of material of the groove land and promotes less penetration. Regarding the metal transfer, the continuous bridge transfer mode is recommended for automated orbital GTAW welding and this is achieved with an appropriate AVC control method and filler wire positioning.

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Section: On Wire Feed Methodology and Metal Transfersupporting

confidence: 69%

Section: On Wire Feed Methodology and Metal Transfermentioning

confidence: 99%