Abstract
Qualification of the hybrid metal extrusion & bonding (HYB) process for welding of aluminium offshore structures
Highlights
The extrusion zone (EZ) in the hybrid metal extrusion & bonding (HYB) weld consists of a mixture of consolidated filler metal (FM) and thermally softened Base metal (BM), where the BM is brought into the groove from the retreating side
It is documented that the HYB process has reached a technology readiness level that makes it suitable for offshore applications
The HYB process qualification applies to butt welding of 4mm AA6082-T6 profiles for use in living quarters, where both gas metal arc welding (GMAW) and friction stir welding (FSW) are currently employed during the assembling stage and design against fatigue failure is not an issue
Summary
They have a nominal chemical composition of about 0.65 wt% Mg - 1.00 wt% Si - 0.50 wt% Mn - 0.20 wt% Fe - 0.03 wt% Cu - 0.02 wt% Ti - Al (balance) and display yield and ultimate tensile strength values in the range from 310-320 and 335-350 MPa, respectively in the T6 temper condition.[20] In the present study, one 4mmthick GMA butt weld (produced using AA5183 filler metal additions) and one 4mmthick FS butt weld, which stem from the production of the Johan Sverdrup living quarter topside structure, have been selected for the HYB benchmarking. The same mandatory and supplementary test regimes have been adopted in the present benchmark study, where the dual objective is to qualify the HYB process for butt welding of 4mm AA6082-T6 extruded profiles and rank its performance against GMAW and FSW under comparable experimental conditions.
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