Metodología para inspección visual en el proceso de soldadura SMAW en tuberías de acero al carbono

Abstract

The objective of this technical project was the elaboration of a visual inspection methodology in the SMAW welding process in carbon steel pipes ASTM A106 grade B. Thus, 3 specimens of different diameter and thickness were elaborated, each of them has with 2 weld joints, with a V-butt joint and a 60° groove angle. Simultaneously, a WPS was developed for the verification of the welding process, in which the welding parameters, characteristics of the filler material and base material are specified, together with a scheme that details the type of joint and its dimensions. Next, different visual inspection techniques were applied, such as videoscopy, dye penetrant and magnetic particles, the same ones that were used under the ASME Section V standard. Subsequently, to make inspection reports for each technique used. These reports were made for each weld bead in where the characteristics of the equipment or material used, the discontinuities found in each weld bead, the acceptance and rejection criteria according to API 1104 and AWS D1.1 standards are detailed. Finally, the methodology for each of the applied techniques was elaborated, which is divided into 4 sections with different steps and parameters to consider. It also has a table of variables for a study prior to the implementation of these tests. It was concluded that for the correct application of the different visual inspection methods, an analysis must be made to select the appropriate technique based on the table of variables detailed in the methodology. It is recommended to comply with the parameters and steps detailed in the different sections of each technique.