The　T-joints　of　medium-thick　6082　Al-alloy　plates　created　by　dual　pulsed　gas　metal　arc　welding　(P-GMAW)　and　bilateral　synchronous　welding　were　investigated　to　improve　weld　quality　using　the　adaptive　deposition　method,　which　calculates　the　minimum　amount　of　deposition　according　to　the　welding　condition,　groove　size,　and　cross-sectional　area,　effectively　reducing　the　heat　input　and　deformation　of　the　welds　on　the　basis　of　weld　filling.　The　optimized　linear　energy　with　a　wire　feed　speed　(WFS)　of　9.5　m/min　can　ensure　a　well-formed　weld　with　a　complete　root　fusion,　and　high-quality　T-joint　welds　were　obtained　both　in　root　openings　of　0　mm　and　1　mm.　The　biggest　penetration　was　4　mm,　which　was　four　times　more　than　that　of　the　result　from　a　single　torch　welding　process.　When　the　distance　between　the　two　welding　torches　exceeded　20　mm,　the　molten　pool　was　completely　separated,　and　process　pores　were　observed　in　the　unfused　root　zone.　Influenced　by　the　thermal　cycles　in　asymmetric　welding,　the　hardness　distribution　changed:　the　width　of　the　softer　zone　at　the　base　plate　with　the　fore　arc　was　smaller　than　that　zone　with　the　rear　arc.　Furthermore,　dual　P-GMAW　bilateral　synchronous　welding　with　an　asymmetric　heat　source　can　further　reduce　the　deformation　of　the　welded　joint　by　about　20%　compared　to　that　of　symmetric　welding.