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Combined welding process for 690-grade high-strength steel of cylindrical pile leg

A welding process and high-strength steel technology, applied in welding equipment, manufacturing tools, arc welding equipment, etc., can solve problems such as high welding cost, reduced production efficiency, and large gap between joints, so as to solve the problem of large welding gap and prevent The effect of welding cold cracks

Inactive Publication Date: 2020-10-13
NANTONG ZHENHUA HEAVY EQUIP MFG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a combination welding process of 690-grade high-strength steel for cylindrical pile legs, which can solve the problems of large butt seam formation gap, high cost of manual welding with single use of electrodes, and decreased production efficiency. Single use of submerged arc welding, due to the large gap, does not meet the basic requirements of submerged arc welding

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  • Combined welding process for 690-grade high-strength steel of cylindrical pile leg
  • Combined welding process for 690-grade high-strength steel of cylindrical pile leg
  • Combined welding process for 690-grade high-strength steel of cylindrical pile leg

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Embodiment Construction

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

[0021] Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art wi...

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Abstract

The invention relates to a combined welding process for 690-grade high-strength steel of a cylindrical pile leg. The combined welding process is characterized by comprising the specific steps of S1: preparation before welding, S2: preheating before welding, S3: manual backing welding, S4: submerged arc welding filling and covering, S5: post heat treatment, and S6: polishing and cleaning. Because a690 high-strength steel thick plate has a large quenching tendency, the preheating temperature is not lower than 150 DEG C, and the generation of welding cold cracks can be prevented; and post heat treatment and heat preservation are carried out after welding, so that good performance and reasonable structure distribution of a welded joint can be guaranteed. The combined welding process of electrode manual arc welding backing and submerged arc welding filling and covering can effectively solve the problem of a large welding gap of the marine platform pile leg.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a combined welding process of 690-grade high-strength steel for cylindrical pile legs. Background technique [0002] With the development of offshore platforms, the high-strength steel EH690 material with a yield strength of 690MPa is more and more widely used on the pile legs of offshore platforms, and the thickness of the material also increases accordingly. At present, in order to ensure good mechanical properties and welding quality of EH690 steel plates on offshore platforms, the commonly used welding methods include electrode manual arc welding and submerged arc welding. However, in actual production, the gap between the butt joints of the pile legs is relatively large, which often does not meet the requirements for submerged arc welding. Single use of electrode manual welding or submerged arc welding is not conducive to production; The two welding methods of submerged ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K9/23B23K9/235
CPCB23K9/235B23K9/186B23K9/23
Inventor 沈波吴正峰田小林陈天怡陈卫东
Owner NANTONG ZHENHUA HEAVY EQUIP MFG
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