Estudio de ondas ultrasónicas para estabilizar el arco en soldadura con arco metálico sumergido bajo agua

Abstract

[EN] Interest in underwater welding has undergone tremendous growth over the years due to the large range of potential economic and logistical advantage offered by the technique [Levi, 2017]. The appeal of underwater welding is that in enables work to be carried out in ships and offshore structures on-site, eliminating the cost of pulling them out of water. It adapts a very useful method (welding) to an unusual situation, such as underwater conditions. With the European approach to use more renewable energy the United Kingdom and Germany account for over two thirds of the world’s total wind power [Wikipedia, 2018]. The usage of offshore wind farms has become more common for harvesting wind energy to generate electricity. More stable and higher wind speeds are found offshore, increasing the amount of energy produced [BOEM, 2017]. Offshore wind farms have a low global warming potential compared to onshore wind farms as there is a reduction of the emissions of greenhouse gases. [M. Dolores Esteban, J. Javier Diez, Jose S.López, Vicente Negro, 2010]. Therefore the increase of offshore wind farms demands further investigation in underwater welding to improve reparations, safety and life expectancy of the underwater structures. The economic and technical incentives motivate studies to improve the process of welding underwater. It has been proven that using ultrasounds helps to stabilize the arc and therefore to improve the consistency of the materials being weld using flux cored wires. An improvement in tensile strength and the bending properties was noticed and during tensile testing the fracture occurrence of the weld joint was transferred from the joint in the base metal. [Q.J.Sun, 2016]. We will use the concept behind stabilizing the arc with ultrasounds to stabilize a wet welding process using stick electrodes.

[ES] El objetivo del proyecto es investigar si las ondas ultrasónicas asistidas mejorarán U-SMAW. Intentaremos incorporar el transductor ultrasónico mientras soldamos para ver si hay mejoras en la soldadura.

Analizaremos la estabilidad del arco, las propiedades de resistencia a la tracción y a la flexión, la distribución de la dureza y el centro de la soldadura y las microestructuras de la zona de fusión.