The invention discloses a gas shielding device for large-
diameter elbow pipe continuous
welding, and relates to the technical field of
elbow pipe production. The gas shielding device for large-
diameter elbow pipe continuous
welding comprises a mounting backboard, an arc-shaped rail, a sliding trolley and a gas shielding box, an elbow pipe main body is fixed at a front side face of the mounting backboard through a set of clamps, a lower part of the mounting backboard is provided with a set of arc-shaped mounting groove, and the arc-shaped rail comprises a set of arc-shaped rods. The gas shielding device for large-
diameter elbow pipe continuous
welding, with the sliding trolley, can guarantee that the gas shielding box can always jack up an inner wall of the elbow pipe main body, meanwhile,the arc-shaped rail is arranged in the elbow pipe main body, and by cooperation of a motor, a first chain wheel, a second chain wheel and a chain, sliding movement of the gas shielding box in the elbow pipe main body can be realized, simultaneously,
shielding gas is introduced into the gas shielding box, a movable
inert gas shielding chamber can be formed at the inner wall of the elbow pipe main body and can move synchronously with an external
plasma welding gun head, and thus, a problem of insufficient
inert gas shielding range of continuous welding for a large-diameter elbow pipe is solved.