Butt joint submerged-arc welding method of bridge steel with tensile strength more than 690Mpa grade

A tensile strength, submerged arc welding technology, applied in welding medium, welding equipment, welding equipment and other directions, can solve the problem of harsh welding working environment, too far difference in toughness index, impact energy can not achieve high strength, high toughness matching bridge engineering structure Manufacturing welding technical index requirements and other issues, to achieve the effects of excellent low temperature impact toughness and crack resistance, high impact toughness reserve and safety margin, and excellent welding process performance

Inactive Publication Date: 2010-03-03
武钢集团有限公司
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AI Technical Summary

Problems solved by technology

[0004] At present, high-strength bridge steel and engineering structural steel with a tensile strength greater than 690MPa mainly adopt manual welding and gas shielded welding. In order to prevent cracks during welding, preheating is carried out before welding. 200℃, and heat treatment must be carried out after welding. Not only is the welding process complicated, the welding working environment is harsh, and the welding efficiency is low. The most important thing is that the mechanical properties of the joint are far from the toughness index of the base material with high toughness.
It cannot meet the welding technical index requirements for the manufacture of long-span, heavy-duty, high-speed bridge steel and large-scale offshore platform lifting structures
In the case of multi-layer welding, the low temperature of the joint (-40℃KV 2 ) impact energy cannot meet the high-strength, high-toughness matching bridge engineering structure manufacturing welding technical index requirements

Method used

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  • Butt joint submerged-arc welding method of bridge steel with tensile strength more than 690Mpa grade

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Effect test

Embodiment 1

[0020] Base material: Quenched and tempered bridge steel with a tensile strength of 690MPa, thick plate combination of 40mm+40mm. The size of the test plate is 600mm×400mm×40mm, the submerged arc welding groove adopts double-sided X-shaped asymmetric groove, the groove angle is 60°, and the blunt edge is 5mm.

[0021] Welding material: The chemical composition and weight percentage of submerged arc welding wire are: C: 0.06, Si: 0.06, Mn: 1.60, Ni: 0.28, Ti: 0.005, Cr: 0.25, P≤0.0095, S≤0.005, and the rest are Fe and Unavoidable impurity elements.

[0022] Matching of submerged arc welding wire and flux: the diameter of submerged arc welding wire is Φ4.0mm, and the flux is CHF105; the mechanical properties of the deposited metal are R el : 600MPa, R m : 695MPa, A: 25%, Z: 72%, -40℃KV 2 Impact energy: 143J. Submerged arc welding butt weld with WNQ690 steel 40mm+40mm plate thickness;

[0023] Welding process parameters are: welding current 570A, welding voltage 31V, welding...

Embodiment 2

[0026] Base material: Quenched and tempered bridge steel with a tensile strength of 740MPa, thick plate combination of 40mm+40mm. The size of the test plate is 600mm×400mm×40mm, the submerged arc welding groove adopts double-sided X-shaped asymmetric groove, the groove angle is 60°, and the blunt edge is 5mm.

[0027] Welding material: The chemical composition and weight percentage of submerged arc welding wire are: C: 0.095, Si: 0.08, Mn: 1.95, Ni: 0.53, Ti: 0.014, Cr: 0.58, P≤0.013, S≤0.009, and the rest are Fe and Unavoidable impurity elements.

[0028] Matching of submerged arc welding wire and flux: the diameter of submerged arc welding wire is Φ4.0mm, and the flux is CHF105; the mechanical properties of the deposited metal are R el : 620MPa, R m : 735MPa, A: 26%, Z: 71%, -40℃KV 2 Impact energy: 139J. Submerged arc welding butt weld with WNQ690 steel 40mm+40mm plate thickness;

[0029] Welding process parameters are: welding current 570A, welding voltage 31V, welding...

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Abstract

The invention relates to a butt joint submerged-arc welding method of bridge steel with tensile strength more than 690Mpa grade, overcoming the defects that at the present, bridge steel and other engineering structural steel which are in 690Mpa strength grade needs preheating before welding and heat treatment after welding and has severe welding environment and the like during manual and gas protective welding. The butt joint submerged-arc welding method comprises the following steps: adopting steel with tensile strength Rm of between 690Mpa and 745Mpa, the yield strength ReL of between 550 and 690Mpa, the extension rate A of between 19 percent and 21 percent, KV2 ballistic work of between 165J and 180J at 40 DEG C below zero and the thickness of 40mmm, and adopting same-thickness butting;adopting matched welding wires with the tensile strength more than 690Mpa and diameter phi of 4.0mm, and using CHF105 as a welding flux; adopting a double-sided X-type asymmetrical submerged-arc welding groove with the angle of 60 degrees and the truncated edge of 5mm; continuously welding until welding seams are full, and under the conditions that the welding current is 570A, the voltage is 31V,the speed is 35cm/min and the linear energy is 30kj/cm; baking the welding flux for 1 hour at 350DEG C and keeping the temperature of welding layers between 100 DEG C and 150DEG C.

Description

technical field [0001] The invention relates to a high-strength steel submerged arc welding method, which is suitable for the submerged arc welding method of high-strength bridge steel and engineering structural steel with a tensile strength greater than 690 MPa. Background technique [0002] With the overall design of bridge structural steel gradually developing towards high strength, heavy load and long span. In order to meet the requirements of my country's engineering construction development, Wuhan Iron and Steel (Group) Corporation has developed high-strength and high-toughness series steels such as WNQ690 in recent years. Its comprehensive mechanical properties have reached the level of similar foreign steels, especially low-temperature impact toughness. Big improvement. The improvement of the performance of the base material puts forward urgent requirements for matching welding materials and welding processes. [0003] Since the welded structure of bridge engineerin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K33/00B23K9/095B23K35/12B23K35/30B23K9/025B23K103/04
Inventor 缪凯牟文广黄治军刘吉斌王玉涛陈浮邹德辉董汉雄龚涛胡因洪
Owner 武钢集团有限公司
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