Assembled ultra-narrow gap MAG/MIG welding insulating spray nozzle

The invention relates to an assembled ultra-narrow gap MAG/MIG welding insulating spray nozzle which comprises a left insulating strip arranged on the left side of a current contact nozzle at the end of an ultra-narrow gap MAG/MIG welding gun body through a sunk screw, front-rear insulating plates and a right insulating strip, wherein the front-rear insulating plates and the right insulating strip are arranged in the middle and on the right portion of the end of the welding gun body respectively. According to the assembled ultra-narrow gap MAG/MIG welding insulating spray nozzle, the spray nozzle is improved to be of a 4-piece-assembled type from a traditional integral type, cracking, breakage and invalidation caused by large local work temperature difference are greatly lowered, and the service life of the spay nozzle is greatly prolonged; the region, with the highest risen temperature, of the spray nozzle under a long-term working environment is located at the front-rear insulating plates at the current contact nozzle, the allowable free expansion amount of the front-rear insulating plates is given in the design, manufacturing and mounting processes, in work, when the front-rear insulating plates are heated through strong thermal radiation of electric arc and convection current, the insulating spray nozzle extends freely totally without rigid constraint in the thermal expansion state, otherwise the spray nozzle can be shortened freely, so that the service life of the insulating spray nozzle is greatly prolonged.