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Butt joint method for super-thick steel plates

A technology of extra-thick steel plates and steel plates, which is applied in the field of butt joints of extra-thick steel plates, can solve the problems of poor flatness of raw materials at the factory, failure to meet design and manufacturing requirements, and machine tool processing capabilities that cannot reach the equality of roll plates and rolls, and achieve the effect of fast heat dissipation

Active Publication Date: 2014-08-27
中铁宝桥(扬州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the steel used for the base plate is Q345D / 150mm thick steel plate, affected by the rolling process of the steel mill, the flatness of the raw material is poor, which is far from meeting the design and manufacturing requirements
And the steel plate thickness of 150mm is rarely used in the field of bridge steel structure manufacturing, and the processing capacity of the machine tool cannot achieve the effect of rolling plate roll flattening

Method used

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  • Butt joint method for super-thick steel plates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The thickness of the steel plate is 140mm, and the material is Q345D. First, process the gap at the joint of the two steel plates. The gap is a double-sided symmetrical U-shaped groove, the angle of the groove is 8°, and the radius of the arc at the root of the groove is 9mm; welding Preheating before the front, the preheating temperature reaches 40±5°C, after preheating, position the weld seam; alternately weld the weld seams on both sides by turning over multiple times, first weld the front weld seam to the 1 / 4 depth of the U-shaped groove Turn over the steel plate at the same time, and then weld the reverse side weld seam, turn over the steel plate again when welding to 1 / 2 depth of the U-shaped groove, and then weld the U-shaped groove on the front side completely, turn over the steel plate for the third time, and weld the U-shaped groove on the reverse side , Each layer of weld seam is de-welded in sections; during the welding process, the steel plate is restrained ...

Embodiment 2

[0029]The thickness of the steel plate is 150mm, and the material is Q345D. First, process the gap at the joint of the two steel plates. The gap is a double-sided symmetrical U-shaped groove, the angle of the groove is 9°, and the radius of the arc at the root of the groove is 10mm; welding Preheating before the front, the preheating temperature reaches 50±5°C, after preheating, position the weld seam; alternately weld the weld seams on both sides by turning over multiple times, first weld the front weld seam to 1 / 4 of the depth of the U-shaped groove Turn over the steel plate at the same time, and then weld the reverse side weld seam, turn over the steel plate again when welding to 1 / 2 depth of the U-shaped groove, and then weld the U-shaped groove on the front side completely, turn over the steel plate for the third time, and weld the U-shaped groove on the reverse side , Each layer of weld seam is de-welded in sections; during the welding process, the steel plate is restrain...

Embodiment 3

[0031] The thickness of the steel plate is 180mm, and the material is Q345D. First, process the gap at the joint of the two steel plates. The gap is a double-sided symmetrical U-shaped groove, the angle of the groove is 10°, and the radius of the arc at the root of the groove is 11mm; welding Preheating before the front, the preheating temperature reaches 60±5°C, after preheating, position the weld seam; alternately weld the weld seams on both sides by turning over multiple times, and weld the front seam first to the 1 / 4 depth of the U-shaped groove Turn over the steel plate at the same time, and then weld the reverse side weld seam, turn over the steel plate again when welding to 1 / 2 depth of the U-shaped groove, and then weld the U-shaped groove on the front side completely, turn over the steel plate for the third time, and weld the U-shaped groove on the reverse side , Each layer of weld seam is de-welded in sections; during the welding process, the steel plate is restrained...

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Abstract

The invention discloses a butt joint method for super-thick steel plates. The butt joint method for the super-thick steel plates comprises the steps of: machining grooves at butt joint parts of the steel plates, wherein the grooves are U-shaped grooves with symmetrical two surfaces, the angle of each groove is 8-10 degrees, and the radius of the arc at the root of each groove is 9-11mm; pre-heating before welding, wherein the preheating temperature is 40-60 DEG C, and locating welded joints after preheating; alternatively welding the welded joints on two sides by turning over for many times, backstep welding the layers of welding joints; keeping temperature in a welding process to be not more than 200 DEG C; keeping warm after welding, and cooling slowly. Since the U-shaped grooves are employed, the sectional area of the welded joints are greatly reduced, thermal input is reduced, control on welding deformation is facilitated, welding residual stress is reduced by backstep welding, two sides of the welded joint of the steel plate are subjected to uniform force by turning over for many times in welding, deformation in the welding process is corrected, the super-thick steel plate is rapid in heat dissipation after welding, quality of the welded joint is ensured by the method of keeping warm after welding, and stress deformation can be reduced by slowly cooling.

Description

technical field [0001] The invention relates to a butt joint method of extra-thick steel plates. Background technique [0002] Steel plates are classified according to their thickness, thin steel plates < 4 mm (thinnest 0.2 mm), thick steel plates 4-60 mm, and extra-thick steel plates 60-115 mm. The base plate of the steel-concrete composite section of the Maanshan Steel Tower has a thickness of 150mm, an outline size of 7800X15900mm, and a weight of 136.9t. It is densely covered with elevator holes, concrete pouring holes, and prestressed steel strand passing holes. The base plate and the bulkheads on it are all required to be polished and tightly welded, and the overall flatness of the base plate unit is highly required during fabrication. Since the steel used for the base plate is Q345D / 150mm thick steel plate, affected by the rolling process of the steel mill, the flatness of the raw material is poor, which is far from meeting the design and manufacturing requirement...

Claims

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Application Information

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IPC IPC(8): B23K9/18B23K9/32
CPCB23K9/02B23K9/18B23K9/235B23K9/32B23K33/00B23K2101/18B23K2103/04
Inventor 李彦国刘志刚李军平吴江波张海涛
Owner 中铁宝桥(扬州)有限公司
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