Defects Comparison Between Single-and Double-Sided Electron Beam Welded Dissimilar DP600 Steel to 5754 Al Alloy Joints: X-Ray Tomography Study

摘要

DP600 steel to Al-5754 alloy dissimilar welding was performed using electron beam welding process at single and double-sided welding with different welding speed condition. Two major weld defects, i.e. porosity and intermetallic compounds (IMCs) were characterized qualitatively and quantitatively in three-dimensional (3D) X-ray computed tomography (XCT) analysis. It was found that both defects average size, average macro size, and number of defects per volume of scan area increases with increasing welding speed. Maximum defects size reduced but total number increases by increasing welding speed. Comparison with single-sided welding, double-sided welding provides quality weld products by decreasing both defects qualitatively and quantitatively. Pores were more homogeneously distributed at double-sided welded products rather than single-sided. Chances of gaseous pores formation were lowest at double-sided welding condition and identified by Raman spectroscopy gas analysis method. Pores and IMCs number per unit volume decreased noticeably by using double-sided beam passing. From our above study, it is clear that lower speed provides quality products. In addition, double-sided welding gives more better products compared with single-sided welding.