Welding type GIL maintenance device and method thereof

The invention discloses a welding type GIL maintenance device and method, and the device comprises a flange type power transmission line which comprises an outer pipe mechanism, an inner pipe mechanism disposed in the middle of the outer pipe mechanism, a connection mechanism disposed on the surface of the inner pipe mechanism, and a fixing assembly disposed between the outer pipe mechanism and the inner pipe mechanism. The reducer pipe is connected with the outer end of the outer pipe mechanism; wherein the outer pipe mechanism and the inner pipe mechanism are coaxially arranged. According to the overhauling device and method for the welding type GIL, all the GILs in an original welding type GIL fault gas chamber are replaced with flange type GILs, when the flange type GILs are in butt joint, shells are connected in a flange butt joint bolt fastening mode, the inner sides are connected in a sealed mode, the links of on-site welding operation, cutting operation, welding seam detection operation and the like a