Avaliação de soldagem de tubos API X65 com passe de raiz com eletrodos de classificação E 6010

Abstract

The pipeline infrastructure is essential for the distribution of natural gas, playing a strategic role in the energy sector and industries that use these gases. The choice of welding procedures for these pipelines is approached with technical rigor, as it is crucial to ensure safety and structural integrity. One of the challenges faced by professionals is technical standardization, which often lacks clear national guidelines, leading to the adoption of the American API 1104 code. This study investigated the use of E 6010 electrodes for the root pass in API X65 pipes and for the second pass, known as the hot pass or root reinforcement pass, using the procedure qualification criteria established in the API 1104 standard. The tensile, face and root bend, nickbreak, Charpy-V impact, and Vickers hardness tests confirmed the technical solutions and highlighted this technique as a cost-effective alternative to the E 8010-P1 electrode. Macroscopic analyses were conducted to visualize the welding passes and ensure accuracy in identifying hardness points. The final results showed that the use of E 6010 meets all applicable technical and regulatory requirements, demonstrating efficiency, safety, and significant cost reduction potential. This approach can be applied to various projects in the oil and gas sector, contributing to process improvements and ensuring the sustainability of operations.