Gas shielded arc welding method for high intensity bridge heavy plate K type joint

A welding method and high-strength technology, applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problem that the impact energy of deposited metal and the actual joint toughness cannot meet the welding technical requirements, the impact energy cannot meet the requirements, and the toughness index is too different To solve problems such as distance, achieve the effect of excellent welding process performance, high impact toughness reserve and safety margin, and excellent crack resistance

Inactive Publication Date: 2009-10-07
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] The main problem at present: the current domestic 600-700MPa grade gas shielded welding material is matched with the welding process, the impact energy of deposited metal and the actual joint toughness are far from meeting the welding technology of the new generation of large-span, heavy-duty, high-speed bridge manufacturing Requirements, especially compared with high-toughness substrates, the toughness index is too far apart
In the case of K-type joints and multi-layer welding of high-strength steel thick plates, the joint strength and low temperature (-40°C KV ) impact energy can not meet the requirements

Method used

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  • Gas shielded arc welding method for high intensity bridge heavy plate K type joint
  • Gas shielded arc welding method for high intensity bridge heavy plate K type joint
  • Gas shielded arc welding method for high intensity bridge heavy plate K type joint

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A method for gas-shielded welding of K-type joints of high-strength bridge steel plates, the steps of which are as follows:

[0022] (1) Substrate: WNQ570, that is, the tensile strength is 575MPa, and after TMCP+tempering, the thick plate combination is 44mm+36mm; the size of the test plate is 600mm×400mm×44(36)mm; its yield strength R eL : 465MPa, elongation: A18%, impact energy -40℃CA KV : 250J bridge steel, a combination of thickness 36 and 44mm; matching welding wire tensile strength greater than 600MPa, welding wire diameter Φ1.2mm;

[0023] (2) The gas shielded welding groove adopts double-sided K-type symmetrical groove, the groove angle is 50°, and the blunt edge is 2mm;

[0024] (3) Welding current 250A, welding voltage 22V, welding speed 20cm / min, welding line energy 17kJ / cm, the volume percentage is 20% CO 2 Add 80% Ar-rich argon as shielding gas and control its flow rate at 18L / min for continuous welding until the weld seam is filled, and the interlayer te...

Embodiment 2

[0028] A method for gas-shielded welding of K-type joints of high-strength bridge steel plates, the steps of which are as follows:

[0029] (1) Substrate: WNQ570, that is, the tensile strength is 650MPa, and after TMCP+tempering, the thick plate combination is 50mm+50mm; the size of the test plate is 600mm×400mm×50mm; its yield strength R eL : 525MPa, Elongation: A22%, Impact Energy -40℃CA KV : 240J bridge steel, a combination of thickness 50 and 50mm; matching welding wire tensile strength greater than 600MPa, welding wire diameter Φ1.2mm;

[0030] (2) The gas shielded welding groove adopts double-sided K-type symmetrical groove, the groove angle is 50°, and the blunt edge is 2mm;

[0031] (3) The welding current is 260A, the welding voltage is 23V, the welding speed is 29cm / min, the welding line energy is 12kJ / cm, and the volume percentage is 20% CO 2 Add 80% Ar-rich argon as shielding gas and control its flow rate at 20L / min for continuous welding until the weld seam is f...

Embodiment 3

[0035] A method for gas-shielded welding of K-type joints of high-strength bridge steel plates, the steps of which are as follows:

[0036](1) Substrate: WNQ570, that is, the tensile strength is 620MPa, and after TMCP+tempering, the thick plate combination is 44mm+36mm; the size of the test plate is 600mm×400mm×44(36)mm; its yield strength R eL : 510MPa, elongation: A21%, impact energy -40℃CA KV : 270J bridge steel, a combination of thickness 44 and 36mm; matching welding wire tensile strength greater than 600MPa, welding wire diameter Φ1.2mm;

[0037] (2) The gas shielded welding groove adopts double-sided K-type symmetrical groove, the groove angle is 55°, and the blunt edge is 2mm;

[0038] (3) The welding current is 255A, the welding voltage is 23V, the welding speed is 24cm / min, the welding line energy is 15kJ / cm, and the volume percentage is 20% CO 2 Add 80% Ar-rich argon as shielding gas and control its flow rate at 19L / min for continuous welding until the weld seam i...

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Abstract

The present invention discloses a gas shielded arc welding method for high intensity bridge heavy plate K type joint which welds wide span high intensity bridge steel K type joint with perfect weld joint property, and does not need pre-warming and post heat-treated. The method is that: using Rm: 570-650 MPa, Rel: 420-490MPa, A:18-24%, -40 deg c A(KV): 120-270J bridge steel with thickness 36-50mm; a matching welding wire Rm: more than 600MPa, the welding wire diameter 1.2mm; a gas shielded arc welding bevel angle is two-sided k type symmetrical, the bevel angle 50-55 degree, blunted edge 2mm; wealthy argon is used as protective gas and flow quality is 18-20 L / min for welding continuously in condition of current 260-250A, voltage 23-22V, welding speed 29-20cm / min and welding weld line energy 12-17 kj / cm for filling the weld joint, an interlayer temperature is controlled between 100-150 deg c.

Description

technical field [0001] The invention relates to a gas-shielded welding method for high-strength bridge steel, especially suitable for tensile strength R m A gas-shielded welding method for K-type joints of long-span bridge structures manufactured from 570-650MPa low-alloy high-strength bridge steel. Background technique [0002] As the overall design of the bridge gradually develops towards high strength, long span, heavy load and high speed. In order to meet the requirements of the development of bridge construction in my country, Wuhan Iron and Steel (Group) Company has developed 14MnNbq, WNQ570, WNQ690 and other high-strength, high-toughness bridge steels, whose comprehensive mechanical properties have reached the level of similar foreign steels, especially low-temperature impact Toughness has been greatly improved. The improvement of the performance of the base material puts forward urgent requirements for matching welding materials and welding processes. Due to the in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K33/00B23K9/095B23K35/38B23K9/02B23K35/30
Inventor 缪凯黄治军刘吉斌王玉涛牟文广董汉雄邹德辉胡家国陈浮方要治
Owner 武钢集团有限公司
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