Auxiliary device for biomass boiler pipeline butt-welding, and welding method thereof

The invention relates to the technical field of welding, and discloses an auxiliary device for biomass boiler pipeline butt-welding, and a welding method thereof. The auxiliary device comprises two arc-shaped connecting plate symmetrical left and right; the inner arc surfaces of the connecting plates can perfectly fit to the outer surface of a pipeline; connecting seats are arranged at the upper ends and the lower ends of the connecting plates; the connecting seats at the upper ends of the two connecting plates can be fixedly connected through a connecting mechanism, and the connecting seats at the lower ends of the two connecting plates can be also fixedly connected through a connecting mechanism; two butt-jointed pipeline end parts are located between the inner arc surfaces of the two connecting plates; welding windows are arranged on the connecting plates and extend along the arc-shaped directions of the connecting plates, and the width of each welding window is larger than the width of a welding line betw