In this study, three different pipe grades, namely X42N, quality A, and quality B, per TS EN ISO 3183 standard were joined by TIG and electric arc welding methods. In order to determine the mechanical properties of the materials after the welding processes and to determine the quality of welding application, radiographic examination, root bend test, nick break test, macrostructure examination, and hardness measurements were carried out. As a result of these analysis, it was determined that the TIG welding method creates less shrinkage in the pipe inner diameter of the weld seam region and provides higher mechanical properties compared to the electric arc welding method. It was also revealed that X42N quality pipe provides better mechanical properties compared to grade B and grade A pipes. When the increases in the hardness values were examined, it was found the mechanical properties were improved with increasing hardness values.