“ALCOA — Samara Metallurgical Plant” JSC, Moscow, Russia:

A. M. Drits, Executive Officer on Development of Business and Technologies, е-mail: Alexander.Drits@alcoa.com

Moscow State Industrial University, Moscow, Russia:
V. V. Ovchinnikov, Professor, Chair of Construction Materials Engineering

There were researched the structure and properties of jump joints of the sheets, made of aluminium alloy 1565chM (1565чМ), with AMg5 (АМг5), AMg6 (АМг6), AV (6061) (АВ (6061)) and 7021 alloys. These sheets were made by argon-arc welding. The level of mechanical properties of such joints was defined together with areas of destruction of these joints, depending on the combination of welded alloys. Research results have shown that aluminium alloys AMg5, AMg6, AV T1 (АВ Т1) and 7021 can be successfully welded with 1565ch (1565ч) alloy and have a low turn to formation of shrinkage cracks. The 1565ch alloy belongs to Al – Mg – Mn system alloys with additional alloying of Zn, Zr and Cr. Mechanical properties of sheets, made of 1565ch alloy, are by 15–25% higher, than the same characteristics of AMg5 and AMg6 alloys. The 1565ch alloy has high plasticity parameters. Welded joints 1565ch + AMg5, 1565ch + AMg6 and 1565ch +AV are destructed on the area of thermal influence from AMg5, AMg6 and AV alloys. At the same time, welded joint 1565ch + 7021 is destructed from the 1565ch alloy. All these combinations of materials can be recommended for the usage for responsible welded joints of cisterns of gasoline tankers and freight cars. Welded joint between the 1565ch alloy has the biggest durability and plasticity. Durability of welded joint in other combinations is by 15–25% lower. There is researched the possibility of welding of 1565ch alloy with heat-treatment hardenable alloys of Al –Mg – Si (6061) system and Al – Zn – Mg system (7021). The welded joint between 1565ch and 6061 alloys is destructed on the area of thermal influence from the 6061 alloy. The welded joint between 1565ch and 7021 alloys is destructed on the area of thermal influence from the 1565ch alloy. Plasticity of welded seam with these combinations is near two times lower than plasticity of welded seam between the alloys of Al – Mg – Mn system. There was researched the corrosion resistance of sheets and welded joints from the 1565ch alloy. During the tests, according to the State Standard and ASTM, there was revealed that the 1565ch alloy and welded joint are resistant to intercrystalline corrosion and layer corrosion. Corrosion resistance of 1565ch alloy is at the level of this characteristics for the AMg5 alloy.

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