The invention relates to an
argon arc welding device for cambered
butt joint with a square aluminum tube. The device includes a rack, a protective box is arranged on the inner bottom of the rack, a
hydraulic cylinder is arranged in the protective box, a
piston rod is arranged on the upper portion of the
hydraulic cylinder, a guiding shell is arranged on the end portion of the
piston rod, a pair ofguiding rails are arranged between the inner side of the rack and the outer side of the protective box, and a moving base is arranged on the guiding rails; a rotary motor and an
argon arc welding machine are arranged on the moving base, a rotating shaft is arranged on the upper portion of the rotary motor, a rotary base is arranged on the end portion of the rotating shaft, the top of the rotary base is provided with a rotating column, a locating
pipe is arranged on the end portion of the rotating column and internally provided with an adjusting
pipe, and an
argon arc welding head is arrangedon the end portion of the adjusting
pipe; a connecting pipe is connected to the rear end of the adjusting pipe, the argon arc
welding head is connected to one end of the connecting pipe, and the otherend of the connecting pipe is connected to the argon arc
welding machine. The argon arc
welding device greatly improves the efficiency of argon arc welding of the square aluminum tube, the argon arcwelding head can be horizontally rotated and adjusted, and the flexibility of argon arc welding performed on the square aluminum tube is significantly improved.