7 Tubular Structures: Welding Difficulty and Potential …
245
Fig. 7.9 a Macroscopic view of FSWed AA5083-O sheets depicting various weld zones and b CT
scan image showing defect-free weld
investigate the soundness of the joint, micro-CT scan was done on the welded tube,
as presented in Fig. 7.9b. It can be observed that there is no occurrence of any void
or flaw in the weld zone which confirms it to be a defect-free welded tube. Hence,
it can be concluded that the chosen parameters for welding produces a defect-free
welded tube.
7.5.2.2 Micrographic Analysis
The microstructures of the as-received AA5083-O alloy and its rolled sheet along
RD are presented in Fig. 10a, b, respectively. The structure of the grains of the
rolled metal (RM) was found to be more elongated in the RD than the as-received
base material (BM). This elongation was caused due to the rolling operation in due
course of forming the sheet. There were no other microstructural changes observed
in rolled AA5083-O sheets due to rolling. The average grain size was found to be
Fig. 7.10 Optical microscopic images of a as received BM and b RM
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Fig. 7.9 a Macroscopic view of FSWed AA5083-O sheets depicting various weld zones and b CT
scan image showing defect-free weld
investigate the soundness of the joint, micro-CT scan was done on the welded tube,
as presented in Fig. 7.9b. It can be observed that there is no occurrence of any void
or flaw in the weld zone which confirms it to be a defect-free welded tube. Hence,
it can be concluded that the chosen parameters for welding produces a defect-free
welded tube.
7.5.2.2 Micrographic Analysis
The microstructures of the as-received AA5083-O alloy and its rolled sheet along
RD are presented in Fig. 10a, b, respectively. The structure of the grains of the
rolled metal (RM) was found to be more elongated in the RD than the as-received
base material (BM). This elongation was caused due to the rolling operation in due
course of forming the sheet. There were no other microstructural changes observed
in rolled AA5083-O sheets due to rolling. The average grain size was found to be
Fig. 7.10 Optical microscopic images of a as received BM and b RM