Abstract
Tailored blanks, especially semi-finished parts formed by welding steel and aluminum alloys, are being employed in the automobile industry to reduce the weight of automobiles. However, when dissimilar metals are welded, galvanic corrosion due to differences in ionization tendency occurs, decreasing the reliability of such welded products. In addition, the heat input when aluminum alloys are welded causes an aging problem. In this study, combined-cycle corrosion testing was performed for S45C/6000 series steel/aluminum alloys joined by friction welding. First, S45C steel pipes were joined to A6061-T6 and A6063-T6 aluminum alloy pipes by friction welding. Then, after combined-cycle testing, changes in appearance and joint strength were investigated as the number of cycles increased. In the natural aging test, test pieces were placed in a desiccator whose temperature was adjusted to about 20 °C with a humidity from 0 to 10 %. One piece was removed at predetermined time intervals and used in tensile testing. After tensile testing, fracture surfaces were observed with an optical microscope. For the S45C/A6061 friction- welded material, a decrease in tensile strength was found at the 36th cycle. It was confirmed that the strength of the S45C/A6063 friction-welded material decreased clearly at the 27th cycle. Any obvious changes in strength were not seen in specimens after 540 hours of natural aging.
Highlights
“Tailored welded blanks” (TWBs) is a term that mainly denotes raw materials welded together to form semi-finished parts destined for subsequent forming
It was found that S45C/A6061 joints were stronger than S45C/A6063 joints
It is thought that this result does not directly mean that welding A6063 to steel is difficult, but merely that the welding conditions adopted here would be more suitable for A6061 welding
Summary
“Tailored welded blanks” (TWBs) is a term that mainly denotes raw materials welded together to form semi-finished parts destined for subsequent forming. The joint strength of steel/aluminum TWBs welded by laser welding have stayed at around 80 % of the base aluminum and aluminum alloy until now In these studies, deep drawing tests were conducted, and limited drawing ratios from 1.7 to 1.9 have been obtained [1,2,3,4]. Combined-cycle corrosion testing of steel/6000 series aluminum alloys joined by frictio In this case, since friction welding involves solid-phase joining performed below the melting point of the materials. To obtain fundamental experimental data for the corrosion properties of steel/aluminum TWBs, dissimilar TWB tubes of S45C steel and 6000 series aluminum alloys were fabricated using friction welding, and combined-cycle corrosion tests were conducted. Fracture surfaces obtained by tensile testing were observed using an optical microscope to investigate the mechanism of corrosion progression and of variation of joint strength
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