Affiliation:
1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, People's Republic of China
Abstract
This paper focuses on pulse metal inert gas welding (P-MIG) and cold metal transfer (CMT) of 6082-T6 aluminium alloy. The microstructure and properties of joints were analysed and the phase transformation of the welding zones (WZ) was calculated using JMatPro. The results showed that CMT joints are better than P-MIG joints in tensile strength and hardness. The main reason is that the average grain size and the second phase size of CMT joints are smaller than those of P-MIG joints. Moreover, the larger number of large-angle grain boundaries (LAGB), diffusely distributed Al3Mg2 and Al6Mn phases in CMT WZ, as well as a small amount of distributed Al3Zr, are beneficial to the joints properties too.
Funder
the Key Science and Technology Project of Yunnan Province
the Key Research & Development Program of Yunnan Province
the Basic Research Project of Yunnan Province
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science