Effect of Welding Parameters on Weld Bead Shape for Welds Done Underwater

Abstract

Abstract:The desire to model a control system so as to optimize the welding process parameters and the effect of the environment during underwater wet welding makes it necessary to study the effects of these parameters as it affects the weld bead geometry of welds achieved in underwater welding. The objective of this paper is to analyze how welding arc current, voltage, speed, and the effect of the water environment affect the weld bead geometry such as bead width, penetration, and reinforcement height. Comparing the differences of the effects of welding input parameters for air and wet welding as it affects the welding output quality parameter is the method employed in this research paper. The result of this study will give a better understanding of applying control mechanism in predicting the quality of a weld during underwater welding. A clearer insight of the weldability of structural steels for offshore applications as it relates to underwater welding, having a full knowledge of the nonlinear multivariable parameters is indicative of better control methods.

Efecto del Aporte Térmico Sobre el Comportamiento Metalúrgico de Soldaduras Subacuáticas Mojadas Empleando el Proceso FCAW-S

“…Esos resultados están de acuerdo con los reportados por Li et al [14]. Por su parte, Emuejevoke Omajene et al [23], también reportan que un incremento en la corriente de soldadura tiende a aumentar la penetración y el refuerzo de los cordones realizados. Por otro lado, es evidente que la tensión eléctrica determina la forma de la sección transversal del cordón y su apariencia.…”

Influence of Arc Brazing Parameters on Microstructure and Joint Properties of Electro-Galvanized Steel

“…Spattering occurs under many factors, such as an unstable arc, and/or unclean joint surface due to inadequate current/voltage supply, etc. [23,24]. The severe melting occurs at high current due to high input according to Equation (1).…”

Mechanical and Microstructural Properties of A36 Marine Steel Subjected to Underwater Wet Welding

“…The greater convective heat transfer coefficient in water compared to air was shown to result in rapid cooling during underwater welding. A low water temperature can result in more inclusions and a higher diffusible hydrogen level in the coarse grain heat-affected zone, which leads to a greater cracking tendency [10].…”