Controle da porosidade na soldagem no processo mig/mag (mig-metal inert gas e mag-metal active gas) na fabricação de componentes automotivos

Abstract

Porosity in robotic MIG and MAG welding is one of the most common defects in the joint of metals. In the automotive sector, the recurrence of this type of defect in welded joints may compromise the quality of the final product, both in terms of appearance and resistance of the welded assembly. The lack of control over the parameters and equipment of Welding, including stick-out, can have a great influence on the occurrence of porosity. This type of defect was identified in the weld seam of the rear axle of a vehicle automotive through macrographic analysis. The objective of this work is to identify the cause and control the occurrence of this defect. The identified cause was the size of the stick-out used in the welding process. To control this parameter, a device in order to set the stick-out size to 17mm. Data obtained after the control confirm the effectiveness of the developed device.