Welding fume suction arm assembly

The utility model belongs to the field of welding fume suction arm assemblies, and particularly relates to a welding fume suction arm assembly which comprises a stand column, a stand column rotating joint is arranged on the stand column, a rhombic main arm is arranged on the stand column rotating joint, an air inlet is formed in the rhombic main arm, a middle rotating joint is arranged on the rhombic main arm, and the middle rotating joint is provided with an air outlet. A base is arranged on the middle rotating joint, a front arm body is hinged to the base, and a front arm body support is hinged to the front arm body. Through the arrangement of the lower plate assembly, the limiting plate, the upper plate assembly, the supporting shaft, the shaft sleeve, the oil filling hole, the limiting pin, the ball, the support assembly, the upper and lower mailbox plates, the front and rear oil tank plates, the oil filling port, the rotating pin, the steel ball and the like, and through the arrangement of the stand colu