Abstract
This study was aimed to investigate the welding parameters on mechanical behavior of 2 mm thick AA1050 sheet materials joined by cold metal transfer (CMT) method. Macro structural examination showed that decreasing heat input decreased the pore size in the weld metal. Tensile test was applied and failure occurred in heat affected zone of aluminum sheet metal. Maximum tensile strength was found in the sample with minimum heat input. Heat affected zone was observed explicitly in the sample produced with the maximum heat input. Decreasing joint gap affected the bending strength positively. Bending strength was found superior with maximum bonding line length.
Highlights
Arc welding of thin sheet aluminum alloys pose unique challenges
Cold metal transfer (CMT) is an automated welding process based on dip transfer welding, characterized by controlled material deposition during the short circuit of the wire electrode to the work piece [4]
Present study revealed that cold metal transfer (CMT) welding method achieved to join 2 mm thick AA1050 aluminum alloy due to its low heat input feature
Summary
Arc welding of thin sheet aluminum alloys pose unique challenges. Due to comparatively high coefficients of thermal expansion and thermal conductivity when compared to steel, control of heat input to the weldments is a major prerequisite to avoid some problems such as burning through and distortion [1,2]. The benefits including thin heat affected zone, little distortion and improved productivity made the cold metal transferring (CMT) process incomparable when applied in welding thin plates and weld-brazing [3]. Cold metal transfer (CMT) is an automated welding process based on dip transfer welding, characterized by controlled material deposition during the short circuit of the wire electrode to the work piece [4]. This arc welding process is reported for working with a lower heat input compared to other arc processes. In the conventional dip arc process the wire is moved forward until a short circuit occurs. The filler metal is moved towards the weld pool
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