Study on Welding of TIG Tailor Welded Galvanized Sheets and Formability of Stretch Forming

In this study TIG welding of Tailor welded Galvanized Sheets and their formability of stretch forming have been carried out. It has been found that the microstructure of weld region is ferrites and pearlites, and the microstructure of heat-affected zone (HAZ) is blocky pearlites and ferrites. Stretch tests suggested that when the weld line parallels the tensile axis, sigma s, sigma b and the sigma s/sigma b is higher than that of the weld line perpendicular to the tensile axis. When the weld line parallels the tensile axis, the elongation of the specimen and n are lower than that of the specimen with the weld line perpendicular to the tensile axis. When the weld line perpendicular to the tensile axis, the fracture surface is basically the same as that of the base metal, when the weld line parallels the tensile axis, the fracture surface is dimples and cleavages.