Argon filling protection device for welding back surface of stainless steel or dissimilar steel branch pipe

Abstract

The invention relates to an argon filling protection device for the welding back surface of a stainless steel or dissimilar steel branch pipe. The argon filling protection device is widely applicableto stainless steel or dissimilar steel welding in various industries. The upper end of a sliding rod is connected with a handle; the lower part of the sliding rod passes through a round pipe sliding rail; a threaded hole is formed in one end, close to the handle, of the round pipe sliding rail; the round pipe sliding rail is in threaded connection with a fastening screw; the round pipe sliding rail is connected with the two ends of a gas distribution pipe; the gas distribution pipe passes through a circular cover plate and is connected through welding; rectangular slot holes are formed uniformly in positions along 0-180 degrees of circumference by taking the center of the circle of the circular cover plate as the center,; a plurality of holes are uniformly drilled in the gas distribution pipe at the lower part of the circular cover plate along the circumference; an argon inlet pipe is welded on the gas distribution pipe at the upper part of the circular cover plate; the lower end of the sliding rod is connected with a bolt; and the bolt penetrates through a rubber piston pad and a gasket to be screwed with a nut. The argon filling protection device has the advantages of being applicable, economical, convenient and reliable, and the welding quality of the branch pipe is improved.

Description

technical field [0001] The invention relates to an argon-filled protective device for welding the back of stainless steel or dissimilar steel branch pipes, which can be widely used in stainless steel or dissimilar steel welding in various industries. Background technique [0002] More than 80% of the welding activities of overhaul, technical renovation and daily inspection and maintenance in operating power plants are welding of stainless steel parts, of which a large number of stainless steel branch pipes (such as BOSS, pipe-pipe) are welded by manual argon tungsten arc welding (also known as "manual TIG welding"), while the stainless steel branch pipe adopts manual TIG bottom welding or single-sided welding and double-sided forming welding method, if the back of the weld seam of the branch pipe is exposed to air, the near surface of the back weld seam will form a "tofu slag" weld seam (causing oxidation , slag, porous or honeycomb defects), directly affect the welding qual...

AI Technical Summary

Problems solved by technology

To fill the whole pipe with argon, it is necessary to try to find the valves arranged at both ends of the pipeline. If there are no valves at both ends of the pipeline to close, this method will not work, and this method of argon filling will cause a great waste of argon, which is costly and expensive. economy

[0009] In summary, the above three methods of argon-filling protection on the back of welding of stainless steel or dissimilar steel branch pipes all have deficiencies or limitations.

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