The utility model provides a be used for welded protection mechanism. Protection mechanism includes: interior safety cover sets up that the orientation of interior safety cover is had a plurality of air vents by the surface of splice by in the welding and be located by the splice two, and the interior inert gas of interior safety cover blows to by the splice through a plurality of air vents, outerprotection cover, the cover is established by the splice to prevent to be entered the external world by the inert gas of splice, outer protection cover has the mouth of operation, operates the mouthand is fed through with the convenience to being welded by the splice by the splice. The utility model discloses inert gas and staff and external direct contact's problem has been solved among the prior art among the titanium pipe welding process effectively.