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Welding Process of Thick Plates and Steel Castings

A welding process and steel casting technology, applied in welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve problems such as welding defects and base metal damage, and save construction costs, reduce repairs, and shorten production. effect of cycles

Active Publication Date: 2016-10-05
JIANGSU NEW TIMES SHIPBUILDING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a welding process for thick plates and steel castings, which can solve the problems of welding defects and base metal damage in the existing process

Method used

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Embodiment Construction

[0024] The present invention will be further described below:

[0025] For specific implementation, first, formulate the welding procedure specification: 1. Scope of application, welding method: a. Approval range: plate thickness 50~200mm; b. Steel grade: EH36 & steel casting; c. Welding method: gas shielded welding; d , Joint form: butt welding; e, preparation and cleaning method of test block: machining, grinding; f, test block thickness: 100mm; g, welding position: vertical welding 3G, flat welding 1G. 2. Control of groove shape: Strictly control the groove angle and assembly clearance, and reduce heat input by reducing the amount of welding. 3. Make relevant requirements on welding methods, welding materials, welding parameters, etc. to ensure welding performance: a. Selection of welding materials: SQJ501Ni(L)4Y; b. Requirements on the back: back planing; c. Gas purity: CO2≥99.95%; d. Gas flow rate: 15~25L / min; e. Back planing and liner: ceramic liner & back planing; f. P...

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Abstract

The invention discloses a welding procedure of thick slabs and cast steel, and relates to the field of marine products, in particular to a welding procedure of EH36 slabs and cast steel, wherein the thickness of the slabs is 100mm. The welding procedure is characterized by including the following machining steps of preparing materials, qualifying and testing the welding procedure, determining a welding sequence and welding conditions, determining whether the welding sequence and the welding conditions are qualified or not, detecting a run-on tab / run-off tab, conducting preheating, sequentially conducting tack welding, backing welding and interlayer welding, finishing welding defects in time, checking the welding process, completing welding, conducting polishing and UT detection, and giving out a report. By the adoption of the welding procedure, the welding defects and base material damage are reduced, and construction cost is saved.

Description

technical field [0001] The invention relates to the field of marine engineering products, in particular to a welding process for a 100mm thick EH36 plate and a steel casting. Background technique [0002] Welding is a processing technology and connection method that produces an interatomic bond between two workpieces through heating, pressure, or both. Welding is widely used and there are many types. Thick plate welding is also a kind of welding. It usually refers to the welding of plates that require three or more layers of multi-layer welding. Its carbon content is relatively high, welding cold cracks are particularly sensitive, and welding is difficult. Thick plates are generally used in more important parts in the hull structure, such as hull plates, main engine bases, etc. The steel castings in the hull structure usually have large thickness and rigidity, and complex shapes, and are generally used for components that bear large loads, such as bow columns, stern column...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/00B23K9/235
CPCB23K9/173B23K9/235B23K2103/04
Inventor 廖军钱炜陆建坤李文彬黄炼唐建波
Owner JIANGSU NEW TIMES SHIPBUILDING
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