Effect of the welding angle on the porosity of underwater wet welds performed in overhead position at different simulated depths

被引:14
|
作者
Luna, Luis Edmundo Ramirez [1 ]
Bracarense, Alexandre Queiroz [2 ]
Pessoa, Ezequiel Caires Pereira [3 ]
Costa, Patricia Sheilla [1 ]
Guerrero, Gerardo Altamirano [4 ]
Reyes, Antonio Enrique Salas [5 ]
机构
[1] Consultores Asociados Soldadura SC, Saltillo, Coahuila, Mexico
[2] Univ Fed Minas Gerais, Dept Engn Mecan, Lab Robot Scldagem & Simulacao, Belo Horizonte, MG, Brazil
[3] LeTorneau Univ, Mat Joining Engn Dept, Longview, TX USA
[4] Tecnol Nacl Mexico IT Saltillo, Div Estudios Posgrad & Invest, Tecnol Nacl Mexico IT Saltillo, Blvd V Carranza 2400 Col Tecnol, Saltillo 25280, Coahuila, Mexico
[5] UNAM, Fac Quim, Dept Ingn Met, Circuito Invest Cient S-N,Ciudad Univ, Ciudad De Mexico 04510, Mexico
关键词
Underwater wet welding; Overhead position; Weld zone porosity; Pore formation; Weld bead morphology; MECHANICAL PERFORMANCE; HYDROSTATIC-PRESSURE;
D O I
10.1016/j.jmatprotec.2021.117114
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This research work reports the porosity evolution during welding in the overhead position as a function of depth and working angle between electrode and plate in the underwater wet welding (UWW) process. For this purpose, different welds were simulated inside a hyperbaric chamber at depths of 10 and 50 m using three different plate angles (10, 30 and 70 degrees) respect with the horizontal and three different weld working angles (40, 50 and 60 degrees). Varnished E6013 electrodes were used and a buoyancy-gravity running mechanized device was designed and employed for performing the welds in the overhead position. The results were discussed in terms of the physical mechanisms related to the formation of pores in the weld zone. Thus, it was revealed that the better working angle is 40 degrees with plate angle set at 10 degrees for the reason that the weld beads performed at the greatest test depth (50 m) exhibited lower levels of surface porosity (< 5%). Through metallographic analysis, it was also found that the volume fraction of pores is strongly dependent on the welding depth, which increases with the greater plate angle in both 10 and 50 m depth conditions. Accordingly, measured average porosity in the weld zone related to these welding depth conditions was 0.34 and 2.8 %, respectively.
引用
收藏
页数:14
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