Estudio de la afectación del proceso de reparación en uniones soldadas de un acero hsla astm a572.

Abstract

The present work has as objective to study the effect of the repair process in welded joints of an HSLA ASTM A572 steel, considering the thermal effects caused by the initial welding, the roughing process and the repair welding process, in order to establish a maximum number of repairs in welded joints, in order to guarantee the structural integrity of the joint. For this, the changes at the microstructural level and in the mechanical properties of the joints with multiple repairs were analyzed. In order to verify the veracity of the acquired material, the tensile test was carried out to compare the mechanical properties tested with those provided by the steel manufacturer. In order to have a broader spectrum of study, the welded joints were formed using two welding procedures, a simple SMAW and a combined SMAW-FCAW procedure. The welds were verified under visual inspection tests and industrial radiography before forming the test specimens to be tested in traction of reduced section and lateral bending, the results of the aforementioned tests allowed to obtain the parameters of the qualified welding and repair WPS, with which the reliability of work and quality of the joints governed under the AWS D1.1 code is guaranteed. The microstructural changes of the joint and the thermally affected area (HAZ) were analyzed under the micrograph and hardness tests, for the variation of the HAZ, macrographs were performed comparing its percent of increase between the number of repairs and processes.