Controlled Short-Circuiting MIG/MAG Welding Process (CCC) Applied to the Root Pass in the Construction of Offshore Oil Pipelines - Process Analysis Tools

摘要

This work consists in the study and development of the Controlled Current Short-circuiting MIG/MAG (or GMAW) Welding (CCC) with enphasis on the analysis tools designed specifically for this process. Currently, root pass in pipe welding is performed predominantly with SMAW, of inherent lower productivity. The semi-mechanized, slag free process herein developed (CCC) yields satisfactory properties welds with higher productivity, obtains the advantages of short-circuiting metal transfer and avoids its inconveniences by means of current waveform control, providing arc and weld pool stability with low welder training time. The developed software based CCC analysis tools are described.