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Registration Number

0215U000672, 0112U002399 , R & D reports

Title

Research of physical-metallurgical peculiarities of the underwater automated arc welding at increased hydrostatical pressure and determination of properties control strategy of properties of low-alloy steels

Head

Maksimov Sergey,

Registration Date

16-03-2015

Organization

E.O.Paton Electric Welding Institute of the National of Sciences of Ukraine

Description

The mechanism of influence of hydrostatical pressure on the weld metal oxygen and hydrogen saturation, the process of pore formation, and processes of heat-, mass- and electrotransfere in the column of the arc and the electrode regions and the stability of its burning are studied. Principles of creation of electrode materials of new generation are set forth in relation to the problem of arc welding directly in the water at higher depths. Flux-cored wires and manual electrodes for welding in salt water of low-alloy higher-strength steels up to 40 mm thick have been developed. Technological bases of the deep-water welding in the automatic mode of pipelines from higher-strength steels are worked out. Of pilot test in the Yellow Sea at welding on of lugs for salvage operations showed that the efforts of destruction exceeds the required in 1.5 times. Industrial testing at sealing heat exchanger tubes at a depth of 207 m in London showed that application of wet flux-cored wire automatic welding can increase the reliability of the heat exchanger, reducing time lost while performing work under its seal, rationally to use an assembling area, bring down financial expenses.

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Бут Віктор Степанович
Грецький Юрій Якович