Inner protective gas rod for welded pipe welding

Abstract

The invention provides an inner protective gas rod for welded pipe welding. The inner protective gas rod comprises a tail end rod section, plugs and a gas outlet rod section, wherein a plurality of gas outlet holes are formed in the gas outlet rod section, the plugs are arranged at two ends of the gas outlet rod section correspondingly, and a gas pressure bin covering the outer side of the gas outlet rod section is formed by the two plugs and the inner wall of a welded pipe; the tail end rod section is provided with a tail end gas hole and communicates with the gas outlet rod section, and gasentering the gas outlet rod section is exhausted through the gas outlet holes and the tail end gas hole; and the inner protective gas rod further comprises a connecting rod section, the connecting rodsection and the tail end rod section communicate with the two plugs correspondingly, and the gas is injected into the gas outlet rod section through the connecting rod section. The inner protective gas rod outputs the stable gas through the gas outlet holes, and the gas pressure bin is formed between the two plugs, so that one lifting force is provided for a weld joint of the welded pipe in the crystallization process, downward acting force borne by liquid metal is reduced, and the effect of protecting the weld joint against subsidence is achieved; and due to the arrangement of the tail end gas hole, the effects of cooling a welded position and preventing the welded position from being oxidized can be achieved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to an inner shielding gas rod used for welded pipe welding. Background technique [0002] Welded pipes, also known as welded pipes, are an industrial method of manufacturing pipes that is superimposed by the two processes of cold bending of strips and welding. Industrialized manufacturing of pipes has the characteristics of high production efficiency, many specifications and varieties, good product stability, and excellent quality. Among all the pipes produced, the production of circular longitudinal welded pipes is the most common, and it has developed rapidly in the contemporary era of rapid industrialization. Products Widely used in industry, agriculture and major national projects. [0003] The most common problem encountered by straight seam welded pipes is that the internal weld reinforcement cannot be effectively controlled, so that the produced pipes form a non-smooth exce...

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Problems solved by technology

[0003] The most common problem encountered by straight seam welded pipes is that the internal weld reinforcement cannot be effectively controlled, so that the produced pipes form a non-smooth excessive shape between the weld seam and the base metal, resulting in stress angles. During the service of time, there will be problems of stress corrosion and crevice corrosion, so that the cracks will expand and cause the pipe to crack

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