Abstract: 7075 aluminium alloy sheets of 4 mm thickness were welded by manual TIG welding method with Al-Mg-Zn and Al-Mg-Zn-Sc-Zr welding wires as filler material. Welded joints were treated by post-weld heat treatment (PWHT) method. The microstructure and mechanical properties of welded joints with and without post-weld heat treatment were investigated. The results showed that the grains of weld metal zone were refined and mechanical property of TIGW joint welded by Al-Mg-Zn-Sc-Zr welding wire was improved obviously. Compared with joint without post-weld heat treatment, the PWHT joint dispersed and precipitated with fine η′(MgZn2) substable phase, which have no effect on the dispersion distribution of secondary Al3(Sc,Zr) particles, and greatly improved the tensile strength and microhardness of the welded joint.
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2019, Vol. 33 
