Device for collecting underwater wet method welding arc ambient gas and use method thereof

The invention relates to a device for collecting underwater wet method welding arc ambient gas and a use method thereof and solves the technical problem of the blank of a gas collecting device in theprior art and the technical problem that quantitative analysis of wet method welding reaction gas cannot be finished. The device for collecting underwater wet method welding arc ambient gas disclosedby the invention is provided with a gas storage device and a gas feeding device, wherein the gas storage device and the gas feeding device are arranged in an up-down through mode and are in sealing and fixed connection; the gas feeding device is of a structure in a reversed funnel shape and comprises a funnel body and a funnel neck, the funnel body and the funnel neck are communicated to form an integrated structure, and an opening of the lower end of the funnel body serves as a gas inlet; the gas storage device is of a structure in a reversed liquid-separation funnel shape and comprises a bottle body, a bottle opening is arranged at the bottom of the bottle body, and the bottle opening and the opening at the upper end of the funnel neck are in fixed and sealing connection; a gas discharging pipe is arranged at the upper part of the bottle body, and a gas exhausting valve is arranged on the gas discharging pipe; the gas storage device is further provided with a welding torch pipe, andthe welding torch pipe penetrates through the funnel body and is in fixed and sealing connection with the funnel body. The device disclosed by the invention can be widely applied to the technical field of underwater wet method welding.