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Submerged arc welding method of bridge steel of different intensity scale

A submerged arc welding and level technology, applied in welding medium, welding equipment, welding equipment and other directions, can solve the problem that the toughness of the impact energy joint of the deposited metal cannot meet the welding technical requirements, and can not meet the welding technical index requirements of large-span bridge manufacturing. Low temperature toughness decline and other problems, to achieve the effects of excellent welding process performance, high impact toughness reserve and safety margin, and high impact energy

Inactive Publication Date: 2009-01-07
武钢集团有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Using the existing submerged arc welding materials to match the welding process, the impact energy of the deposited metal and the actual joint toughness are far from meeting the welding technical requirements of modern long-span bridge manufacturing, especially compared with high toughness base materials, the toughness index is different too far
In the case of large input energy and multi-layer welding, the low-temperature toughness of the joints decreases significantly, which is far from meeting the welding technical index requirements of the new generation of long-span bridge manufacturing

Method used

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  • Submerged arc welding method of bridge steel of different intensity scale
  • Submerged arc welding method of bridge steel of different intensity scale
  • Submerged arc welding method of bridge steel of different intensity scale

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Experimental program
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Effect test

Embodiment 1

[0023] Base material: WNQ570 is a steel plate produced by thermomechanical control rolling process (TMCP+tempering), 14MnNbq is a steel plate produced by normalizing, and the thick plate combination is 32mm+32mm; the thickness of 14MnNbq bridge steel is 32mm, and the mechanical properties of the steel plate are: yield Intensity R eL : 370MPa, tensile strength R m : 530MPa, Elongation A: 35%, -40℃CA KV Impact energy: 172J; WNQ570 bridge steel has a thickness of 32mm, and the mechanical properties of the steel plate are: yield strength R eL : 490MPa, tensile strength R m : 585MPa, Elongation A: 27%, -40℃CA KV Impact energy: 270J. The size of the test plate is 600mm×400mm×32mm; the submerged arc welding groove adopts X-shaped asymmetrical groove, and the groove size sees Figure 1a As shown, the groove angle is 60°, and the blunt edge is 6mm.

[0024] Matching welding materials: The chemical composition and weight percentage of welding wire are: C: 0.06, Si: 0.06, Mn: 1.5, N...

Embodiment 2

[0029] Base material: WNQ570 is a steel plate produced by thermomechanical control rolling process (TMCP+tempering), 14MnNbq is a steel plate produced by normalizing, and the combination of thick plates is 50mm+50mm; the thickness of 14MnNbq bridge steel is 50mm, and the mechanical properties of the steel plate are: yield Intensity R eL : 415MPa, tensile strength R m : 510MPa, Elongation A: 26%, -40℃CA KV Impact energy: 120J; the thickness of WNQ570 bridge steel is 50mm, and the mechanical properties of the steel plate are: yield strength R eL : 560MPa, tensile strength R m : 650MPa, Elongation A: 21%, -40℃CA KV Impact energy: 220J. The size of the test plate is 600mm×400mm×50mm; the submerged arc welding groove adopts X-shaped asymmetrical groove, and the groove size sees Figure 1b As shown, the groove angle is 60°, and the blunt edge is 6mm.

[0030] Matching welding materials: The chemical composition and weight percentage of welding wire are: C: 0.09, Si: 0.05, Mn: ...

Embodiment 3

[0035] Base material: WNQ570 is a steel plate produced by thermomechanical control rolling process (TMCP+tempering), 14MnNbq is a steel plate produced by normalizing, and the thick plate combination is 60mm+60mm; the thickness of 14MnNbq bridge steel is 60mm, and the mechanical properties of the steel plate are: yield Intensity R eL : 395MPa, tensile strength R m : 550MPa, Elongation A: 20%, -40℃CA KV Impact energy: 290J; the thickness of WNQ570 bridge steel is 60mm, and the mechanical properties of the steel plate are: yield strength R eL : 420MPa, tensile strength R m : 570MPa, elongation A: 18%, impact energy A at -40°C KV : 120J. The size of the test plate is 600mm×400mm×60mm; the submerged arc welding groove adopts X-shaped asymmetrical groove, and the groove size sees Figure 1c As shown, the groove angle is 60°, and the blunt edge is 6mm.

[0036] Matching welding materials: The chemical composition and weight percentage of welding wire are: C: 0.12, Si: 0.06, Mn:...

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Abstract

The invention discloses a hidden arc welding method for bridge steel at different levels of strength, which adopts two steel types with different tensile strengths, namely 510-550MPa and 570-650MPa as the subject of hidden arc welding; an X-type asymmetric divided edge is adopted as the divided edge of hidden arc welding; the adopted steel types are 14MnNbq steel and WNQ5709 steel; the yield strength ReL of the 14MnNb steel is 370-415MPa, the tensile strength Rm thereof is 510-550MPa, the unit extension A thereof is 20-35%, and the -40 DEG C AKV impact energy thereof is 120-290J; the yield strength Rel of the WNQ570 steel is 420-560MPa, the tensile strength Rm thereof is 570-650MPa, the unit extension A thereof is 18-27%, and the -40 DEG C AKV impact energy thereof is 120-270J; the thickness of steel plates is 32-60mm; the angle of the divided edge is 60 DEG; and the length of the truncated edge is 6mm. The hidden arc welding method meet the requirements for using the key hidden arc welding technique to manufacture dissimilar steel joints with a novel bridge structure of large-span, heavy-duty, high-speed, high-strength and high-tenacity. The joints made through hidden arc welding have good tensile strength and cold-bending performance; the impact energy of the three areas of the joint reaches a high level; and the joints have relatively high impact tenacity reserve and safety margin.

Description

technical field [0001] The invention relates to a method for submerged arc welding, in particular to a method for submerged arc welding of bridge steels of different strength levels. Background technique [0002] Due to the increasing development of bridge welded structures in the direction of high parameters and large-scale, this puts forward higher and higher requirements for the performance of steel for welded structures, not only must have good comprehensive mechanical properties, but also have good processing performance, The quality of weldability is one of the main indicators to evaluate the performance of steel. Weldability, welding materials and corresponding welding processes are the three basic elements for welding low-alloy structural steel, and the three are inseparable. Therefore, if the weldability of different steel strength levels of long-span bridges and the supporting welding materials and welding processes are not solved in a timely and effective manner,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K33/00B23K9/095B23K35/30B23K101/28
Inventor 缪凯刘吉斌黄治军王玉涛牟文广陈浮胡因洪周运武
Owner 武钢集团有限公司
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