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

: 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 p...

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Bibliographic Details
Published in:Soldagem & Inspeção 2022, Vol.27, p.1
Main Authors: Pigozzo, Ivan Olszanski, Gonçalves e Silva, Regis Henrique, Wallerstein, Daniel
Format: Article
Language:English
Subjects:
Automatic welding
Automation
Bevels
Continuous bridges
Control methods
Counterboring
Fillers
Gas tungsten arc welding
Grooves
METALLURGY & METALLURGICAL ENGINEERING
Orbital welding
Performance evaluation
Pulsed current
Shielded metal arc welding
Vertical orientation
Wall thickness
Weld metal pool
Wire
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Summary:: 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
ISSN:0104-9224
1980-6973
1980-6973
DOI:10.1590/0104-9224/si27.12