Reinforcement cage welding auxiliary tool and welding auxiliary method

The invention relates to a reinforcement cage welding auxiliary tool and a welding auxiliary method.The welding auxiliary tool comprises a fixing rod, a positioning rod used for clamping a fixed main reinforcement and a limiting assembly used for positioning a to-be-fixed main reinforcement, the first end of the positioning rod is fixed to the fixing rod, and the second end of the positioning rod is fixed to the limiting assembly; the limiting assembly comprises a limiting plate arranged on the fixing rod in a sliding and sleeving mode and a fastener used for locking the limiting plate on the fixing rod. The fixing rod is a screw rod, and the fastener is a nut which is screwed on the fixing rod and located on the side, back to the positioning rod, of the limiting plate. The spacing between the two main reinforcements is controlled by limiting the previous main reinforcement and the next main reinforcement at the same time through the positioning rods and the limiting plates, and the technical problem that in