The current work is part of a larger project to study the application of API 5L X80 steel tubes, produced in Brazil, in gas pipeline fabrication. The objective of this work is to evaluate the effects of the process parameters used when performing a circumferential welding technique which combines the utilization of coated electrodes for the root and hot passes, while exploiting self-shielded flux cored arc welding for the filling and finishing passes. The results obtained indicate that, though the material studied, both filler metal and the base alloy, meet the basic toughness and strength specifications of the relevant standards, the final overall quality of the joint is very dependent on the skill of the welders. Although there is a necessity to guarantee an adequate level of training for these professionals for such tasks, that would be beyond the scope of then present work, as it aims to emphasize the characterization of the circumferential weld itself. The mechanical properties were evaluated using hardness measurements, bend testing, nick-break tests and toughness was evaluated by Charpy notchimpact tests. The metallographic characterization of the girth weld joint was undertaken by means of optical and scanning electron microscopy. Though the specific methodology applied has not been qualified by the API 1104 Standard, as such, the strength values obtained were of acceptable levels and an analysis of the joint`s microstructure and overall mechanical properties confirm that no typical fragile structures or phases were present either in the weld metal or the heat affected zone.