One-time forming device and method for longitudinal submerged arc welding steel pipe

Abstract

The invention relates to a one-time forming device and method for a longitudinal submerged arc welding steel pipe. The device comprises material preparation equipment, a material conveying roller way, an edge milling machine and a one-time forming combined machine. The material preparation equipment is sequentially and mechanically connected with the edge milling machine and the one-time forming combined machine through the material conveying roller way, and a steel plate ultrasonic measuring instrument is arranged between the material preparation equipment and the edge milling machine. The material preparation equipment comprises steel coil preparation equipment and steel plate preparation equipment, wherein the steel plate preparation equipment is connected with the steel coil preparation equipment through a steel plate moving table. The forming process comprises the steps of steel pipe raw material preparation, steel plate ultrasonic flaw detection, steel plate edge milling, steel plate pre-bending, rough forming, fine forming, sizing, seam closing, pre-welding, fixed-length pipe cutting and product discharging in a longitudinal submerged arc welding steel pipe forming device at a time. According to the invention, the material preparation mode is widened, the production of the longitudinal submerged arc welded steel pipe is automatically controlled, the steel pipe product quality and the production efficiency are improved, and the cost and the labor intensity are favorably reduced.

Description

Technical field [0001] The present invention belongs to the field of industrial production, involving a steel pipe production technique, and more particularly to a disposable molding apparatus and method for direct sewing arc welding steel tubes. Background technique [0002] Decanite arc welding steel tubes will have a large proportion of performance in the future transport fluid pipeline, and the long-term oil and gas pipeline will gradually replace the spiral arc welding pipe. The advantages of the bubble arc welding steel pipes are in the construction of long-range pipelines, and the line steel pipes account for considerable proportion. Under normal circumstances, the line steel pipe investment accounts for 35% to 40% of the total project investment. The welding process adopted by the submerged arc welding steel pipe is a submerged arc welding technology, which is welded by a filler, and the particulate protective flux is buried. The production of the diameter can reach 1500m...

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Problems solved by technology

[0003] The forming process of JCOE or UOE straight seam submerged arc welded steel pipes can only use steel plates as raw materials for production and preparation, and the selection of raw materials is limited. The equipment involved in the production and forming is not online, such as feeding, milling, forming, Jointing and pre-welding are independent equipment, which cannot form continuous forming production. Each equipment must be operated and controlled independently. The production speed is not related to each other. The intervention of human factors is strong and serious, and the outer diameter of the steel pipe end and the outer diameter of the pipe have a large deviation

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