期刊
JOURNAL OF MANUFACTURING PROCESSES
卷 68, 期 -, 页码 1615-1636出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jmapro.2021.06.070
关键词
Tailor welded blanks (TWBs); Aluminium alloys; Electron beam welding (EBW); Laser beam welding (LBW); Post-weld heat treatment (PWHT); Cold forming; Stamping; Weld microstructure
资金
- Innovate UK [160080]
- High Value Manufacturing Catapult (HVMC)
- Innovate UK [160080] Funding Source: UKRI
This study demonstrates the applicability of electron beam welding and laser beam welding techniques in manufacturing tailored welded blanks from different aluminum sheets. With an optimal post-weld heat treatment, improvements in elongation and hardness distribution of the welds were achieved, allowing for cold forming at ambient temperature.
This work demonstrates applicability of electron beam welding (EBW) and laser beam welding (LBW) techniques for manufacture of tailored welded blanks (TWBs) from Al-5251 (H22) and Al-6082 (T6) sheets. A combination of dissimilar sheets as well as thicknesses (1.5 mm and 2.5 mm) has been used in addition to a similar combination. An optimal post-weld heat treatment (PWHT) was determined that was effective in relieving stresses and impart adequate ductility in the TWBs allowing cold forming (i.e. stamping), into a cruciform geometry, at ambient temperature. Pull tests revealed marked improvement in elongation for all the welds, including all combinations, after PWHT. Micro-hardness mapping of the weld sections showed transition from a non-uniform to a more uniform distribution via slight increase in hardness of the weld region whilst decrease in the hardness of the parent materials. Non-contact optical measurement using GOM camera showed minimal localised thinning in steep angled areas of the cruciform geometry. The dissimilar LBW TWBs, after PWHT, showed noticeable increase in elongation, homogeneous hardness distribution and slightly refined microstructure in the fusion zone (FZ) compared to their EBW counterparts.
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