This machine is composed of traveling cart,welding arm,welding gun mechanical tracking device,pneumatic system,electrical control system,flux feeding and recovery machine and submerged arc welding the box beam.It is always used for box-beam SAW welding.There are two kinds of welding method for box-beam SAW welding,single arc single wire and double arc double wire.For single arc single wire welding,the welding power can be domenstic-made or foreign-imported;while for double arc double wire welding,usually equipped with welding power Amercian Lincoln DC-1000,AC-1200 to improve work efficiency.