With regards to the 5000 group, the 6000 group and the 7000 group aluminium alloys which have recently begun to be applied to the lower structural components of automobiles as well as ships, railway carriages and structures for civil engineering and construction, 7 kinds of alloys were subjected to a comparative study in terms of the strength of MIG welded joints by using 3.0 mm thick plates. The following findings were obtained as a result. 1) As a result of the tensile test of butt-joints with weld reinforcement, with the 5000 group alloys, 5154-O and 5083-O, nearly 100% of joint strength could be obtained. With the 6000 group alloys, 6061-T6 and 6N01-T5, which have softened parts affected by welding-heat, the joint strength was about 70%. The joint strength of the 7000 group alloys, the strength of whose heat-affected softened part improves owing to natural ageing, was about 80 to 90%. 2) The thermally treated alloys of 6000 and 7000 groups fractured at the weld heat-affected zone and their butt-joints have the level of tensile strength in proportion to the minimum hardness of their weld heat-affected zone. 3) As a result of conducting the tensile test on the lap-joints by one-side fillet welding, with all the base materials tested fracture occurred at the weld metal, their tensile strength was lower than those of butt-joints, and their joint efficiency was about 40-70%. Also, the determining factors for joint strength cannot be explained only by the strength of the base material and the hardness of the weld.
Tensile strength of MIG-welded aluminium alloys for structures
Welding International ; 22 , 4 ; 199-205
2008
7 Seiten, 17 Bilder, 3 Tabellen, 6 Quellen
Article (Journal)
English
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