A method for evaluating the liquation cracking susceptibility of welded joints in Al–Mg–Si alloys

Abstract

Welded joints in 6005-T6 alloy, strengthened by heat treatment, are investigated. The temperature dependences of the mechanical properties are determined using the Gleeble^® 3800 System equipment in the welding conditions. The unknown parameters of the volume heat source are determined by inverse modelling. Three-dimensional problems of thermal conductivity and thermal plasticity are solved numerically. Accumulated plastic strains are used as a criterion for the formation of liquation cracking. The proposed method can be used to predict the formation of liquation cracks in welding of 6005-T6 alloy.

Keywords:

• welded joints
• aluminium alloy
• mechanical properties
• liquation cracking