Construction method for all-position automatic welding of hydropower-station super-size pressure steel tube

A pressure steel pipe and construction method technology, applied to arc welding equipment, manufacturing tools, welding equipment, etc., can solve problems such as tight construction schedule, unsatisfactory demand, high strength, etc., achieve reduced labor intensity, stable and reliable welding quality, and improved The effect of welding efficiency

Inactive Publication Date: 2017-10-17
CHINA GEZHOUBA GRP MECHANICAL & ELECTRICAL CONSTR
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially the welding construction of large-diameter thick-walled pressure steel pipes and volutes, due to the tight construction period, high strength, high quality requirements, and the shortage of skilled welders, the traditional manual arc welding has become increasingly unable to meet the demand

Method used

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Embodiment Construction

[0031] The present invention will be described in detail below.

[0032] A construction method for all-position automatic welding of giant penstock steel pipes in a hydropower station, comprising the following steps:

[0033] The first step is to round the steel pipe tiles with steel pipes;

[0034] The second step is to perform tack welding at the back seam of the steel pipe weld;

[0035] The third step is to clean and polish the weld groove;

[0036] The fourth step, preheating before welding;

[0037] The fifth step is to attach the flexible track to the steel pipe along the weld seam to be welded;

[0038] In the sixth step, the welding trolley with inverter pulse power supply walks and welds on the flexible track. The welding trolley adopts solid welding wire for automatic welding, and is equipped with argon-rich gas protection measures;

[0039] The seventh step is to weld the stiffened ring flaps at both ends of the steel pipe;

[0040] The eighth step is to trans...

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PUM

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Abstract

The invention discloses a construction method for all-position automatic welding of a hydropower-station super-size pressure steel tube. The construction method comprises the following steps that a round steel tube is assembled by steel tube tiles; positioned welding is conducted on the back joint of a steel tube welded joint; cleaning and polishing are conducted on a welded joint groove; weld preheating is conducted; a flexible railway is absorbed on steel tubes along a to-be-welded welded joint; a welding tractor conducts welding while walking on the flexible railway, automatic welding is conducted by the welding tractor through solid core wires, and meanwhile a rich-chlorine gas protective measure is arranged; ribbed ring lobe pieces are welded to the two ends of the steel tube; the steel tube is transported to a previous steel tube, and girth welding is conducted on the two steel tubes; and butt welding of ribbed rings are conducted. According to the construction method for all-position automatic welding of the hydropower-station super-size pressure steel tube, the flexible railway is adopted so that the welding tractor can freely crawl along the surface of the pressure steel tube, thus all-position welding is achieved, the labor intensity of workers is greatly relieved, and the welding efficiency is improved; and the welding tractor automatically completes welding in the whole process, so that the welding quality is stable and reliable.

Description

technical field [0001] The invention relates to a construction method for all-position automatic welding of a giant penstock steel pipe of a hydropower station, which is used for all-position automatic welding of the penstock steel pipe of a hydropower station. Background technique [0002] For a long time, the traditional low-efficiency, high-energy-consumption, simple and heavy manual arc welding has been used in the welding of penstocks in hydropower stations. With the intensive construction of large and giant hydropower stations in China in recent years, my country's hydropower construction has entered an unprecedented stage of rapid development. Especially the welding construction of large-diameter thick-walled pressure steel pipes and volutes, due to the tight construction period, high strength, high quality requirements, and the shortage of skilled welders, the traditional manual arc welding has been increasingly unable to meet the demand. For this reason, the develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/00B23K9/235
CPCB23K9/0026B23K9/235
Inventor 卫书满周复明陈强
Owner CHINA GEZHOUBA GRP MECHANICAL & ELECTRICAL CONSTR
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