Method for improving welding efficiency of butt joint of 9% nickel steel upwardly-added flat butt joint plate

By using an X-shaped bevel design and a multi-layer, multi-pass welding method, combined with the use of a clamping plate and an arc-extinguishing plate for fixation, the problem of low efficiency in overhead and flat butt welds of 9% nickel steel LNG storage tank panels was solved, achieving a high-efficiency and low-cost welding effect.

CN116372317BActive Publication Date: 2026-08-04NANTONG RUNBANG OFFSHORE ENG EQUIP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANTONG RUNBANG OFFSHORE ENG EQUIP CO LTD
Filing Date
2023-05-08
Publication Date
2026-08-04

AI Technical Summary

Technical Problem

The existing technology for welding the overhead and flat butt joints of 9% nickel steel LNG storage tank panels has low welding efficiency, high material and labor costs, and difficulty in guaranteeing welding quality.

Method used

An X-shaped bevel design is adopted, combined with a clamping plate and an arc-extinguishing plate for fixation. A front-to-back welding method is used to perform multi-layer, multi-pass welding on both the flat and overhead welding surfaces. ENiGrMo-6 welding rods are used, and welding parameters and hand gestures are controlled to avoid carbon gouging and grinding.

Benefits of technology

It increases welding efficiency by more than 100%, reduces material consumption by 30%, labor costs by 50%, and significantly improves welding quality and internal quality, meeting the requirements for low-temperature impact.

✦ Generated by Eureka AI based on patent content.

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    Figure CN116372317B_ABST
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Abstract

This invention discloses a method for improving the welding efficiency of overhead and flat butt welded plates of 9% nickel steel. (1) An X-shaped groove is opened on the 9% nickel steel plate and the assembly is completed according to the X-shaped groove assembly size requirements. (2) The blunt edge of the groove surface of the 9% nickel steel plate is ground and impurities are removed from both sides of the weld on the overhead and flat welding surfaces of the groove. (3) The overhead welding surface of the 9% nickel steel plate is reinforced and fixed with a caliper plate, and an arc-starting and arc-extinguishing plate is installed at the arc-starting and arc-extinguishing end of the 9% nickel steel plate weld. (4) When welding the flat welding surface of the X-shaped groove of the 9% nickel steel plate, the root pass is performed first, followed by the fill pass, and then the cover pass. (5) When welding the overhead welding surface of the X-shaped groove of the 9% nickel steel plate, the root pass is performed first, followed by the fill pass, and then the cover pass. (6) The appearance of the overhead and flat welding surfaces and the internal quality of the weld are inspected. The weld root of this invention has good fusion, reducing welding workload and lowering construction costs.
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