Tool for preheating cylinder body circular seam before welding and removing hydrogen after welding and using method of tool

Abstract

The invention discloses a tool for preheating a cylinder body circular seam before welding and removing hydrogen after welding and a using method of the tool, belongs to the field of container manufacturing and welding, and overcomes the defects in the prior art. The tool structurally comprises burners (1), a concave arc-shaped heating pipe (2), an oxygen-enriched gas pipe (3), a supporting pipe (4), a support (5), a fixing screw (6), a gas pipe (7), an oxygen-enriched air pipe (8), an air stop valve (9) and a gas stop valve (10), wherein the supporting pipe (4) is welded in the center of thesupport (5); the lower end of the oxygen-enriched gas pipe (3) is assembled inside the supporting pipe (4), and the height of the oxygen-enriched gas pipe (3) is adjusted by the fixing screw (6); theair stop valve (9) controls the oxygen-enriched air pipe (8); the gas stop valve (10) controls the gas pipe (7); the oxygen-enriched gas pipe (3) communicates with the inner cavities of the gas pipe (7) and the oxygen-enriched air pipe (8); the upper end of the oxygen-enriched gas pipe (3) communicates with the inner cavity at the lowest point of the concave arc-shaped heating pipe (2); two ends of the concave arc-shaped heating pipe (2) are closed; and the burners (1) are uniformly distributed on the inner side of the concave arc-shaped heating pipe (2).The using method comprises the steps ofuniformly rotating the cylinder body; placing the tool under the cylinder body circular seam; opening a valve to ignite; and adjusting a stop valve to control the flame. The tool is capable of meeting process requirements and wide in practical range.

Description

[0001] Technical field [0002] The invention belongs to the field of container manufacturing and welding, and relates to preheating and post-welding hydrogen elimination processes for cylinder girth seam welding. Background technique [0003] Pressure vessels mainly operate under high temperature and high pressure conditions, and must bear relatively high loads. Therefore, the weld metal and heat-affected zone of the pressure vessel must have high strength, high enough impact toughness and high heat resistance, and ensure that the welded joint has no cracks, slag inclusions and other defects. In order to ensure the quality of the weld seam of the pressure vessel, it is necessary to preheat the groove to be welded before welding. The welding can only be carried out after the preheating temperature meets the process requirements, and the hydrogen elimination treatment should be carried out immediately after welding. However, the pre-weld preheating and post-weld hydrogen eli...

AI Technical Summary

Problems solved by technology

However, the pre-weld preheating and post-weld hydrogen elimination tooling in the prior art is heated by a single gas nozzle, and the heating rate is relatively slow, and the heating is uneven, especially for the circular seam of the medium-thick plate cylinder, the effect is not ideal, and the weld seam is affected The quality of the welding seam cracks in severe cases, resulting in repeated repairs

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