Owing　to　the　rapid　cooling　rates,　the　deposited　and　base　metals　could　be　mixed　incompletely　during　laser　welding　of　Al　alloys　in　most　cases.　The　objective　of　this　research　is　to　explore　a　possible　method　to　promote　the　mixing　of　materials　inside　the　molten　pool　by　making　use　of　the　magnetofluid　dynamic　effect　of　electric　current.　Full　penetration　CO2　laser　welding　of　3　mm　thick　alloy　6009　sheets　was　performed　with　an　external　electric　current　simultaneously　into　the　weld　pool　via　a　filler　wire.　It　is　found　that　the　deposited　metal　is　mainly　concentrated　on　the　upper　part　of　the　weld　fusion　zone,　and　the　weld　zone　microstructure　is　non-uniform　without　the　electric　current　addition.　With　the　application　of　an　electric　current,　the　weld　fusion　zone　geometry　is　reshaped,　and　the　chemical　composition　and　microstructure　of　the　weld　metal　are　homogenised.　The　mechanism　is　found　to　be　electromagnetic　force　stirring　of　the　molten　pool.