Análise da variação da geometria dos canais da mesa de soldagem no processo de friction stir welding

Abstract

Friction stir welding is a process of welding by friction, still in development and with many parameters being established empirically for each specific case. The process is capable of performing continuous linear welding due to the friction generated by the rotation of a non-consumable tool in the region to be joined. The table of support has the function of assisting in fixing the parts and ensure a good dissipation of the heat generated in the process. There are still few studies under the influence in the table of support in the process and in the generation of defects. It is intended to verify the influence of the existence of a channel in the support table, under the welding line, with two different geometries (concave and rectangular) compared to the results obtained without the existence of the channel in the quality of the welded joints of aluminum in the alloys 5053-H34 and 1200-H14. The channels should allow a complete penetration of the tool without any contact of the tool with the table of support. This study proved to be ineffective in improving the quality of the welded joint. The channels only harmed the union for 5052-H34 aluminum alloy. While for the 1200-H14 aluminum alloy the rectangular channel avoided tool contact with a table, which was find in the absence of a channel, without apparent damage to the quality of the weld, while the concave channel impaired the quality of the joint.