|
Because the characteristics of low weight, easy formability, good corrosion and oxidation resistance, aluminum alloy have been applied extensively in engineering structures and general appliances. Because the increase ing use in the industry, it is very important to study the weldability of dissimiliar joing of aluminum alloys.
The purpose of this research was to systematically study the weldability of aluminum alloys under Tungsten Inert Gas Arc Welding (TIG). The base metals used were 5052-H32 and 6061-T6 with filler metal of ER5356. Different post weld heat treatments of the 5052 and 6061 weldments were conducted. A series of experiments including tensile testing, microhardness testing, optical metallography and SEM analysis were used to determine the releationship between mechanical properties and microstructures of the alumimum weldments.
The experimental results indicate that there is no obvious difference on the 5052-H32 weldments because they are non-heat-treatable aluminum alloys. Proper post weld heat treatment (160℃, 8 hours) can increase the mechanical properties of the 5052-6061 weldments. Post weld full heat treatment has a great influence on mechanical properties of the HAZ of 6061-T6 weldment.
|