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High-strength Q500qE bridge steel thick plate submerged-arc welding method

A submerged arc welding, high-strength technology, applied in welding equipment, arc welding equipment, edge parts of workpieces, etc., can solve the problems of inability to meet the technical requirements of construction, construction environment, manufacturing costs and manufacturing cycle difficulties, and achieve high impact The effect of toughness reserve and safety margin, excellent crack resistance and excellent low temperature toughness

Inactive Publication Date: 2014-07-02
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the manufacturing process of large-scale steel structures, pre-weld preheating and post-weld heat treatment mean that the construction environment, manufacturing cost and manufacturing cycle are difficult, and cannot meet the technical requirements of construction.

Method used

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  • High-strength Q500qE bridge steel thick plate submerged-arc welding method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Base material: Q500qE, thick plate combination 50mm+50mm. The size of the test plate is 600mm×400mm×50mm, the submerged arc welding groove adopts double-sided U symmetrical groove, the groove angle is 60°, the blunt edge is 7mm, and R7mm. Welding material matching: WQ-6 welding wire, flux is SJ101Q, mechanical property of deposited metal is R el =542MPa, R m =630 MPa, A=25%, Z=74%, -40℃KV 2 Impact energy = 143J. Butt welding with Q500qE steel (50mm+50mm) thick plate, welding material is WQ-6 welding wire, welding wire diameter Ф5.0mm; welding process specification: welding current 630 (A), welding voltage 31 (V), welding speed ~34 ( cm / min), the welding line energy is 35 (kj / cm); submerged arc welding adopts multi-layer and multi-pass continuous welding, the temperature between layers is controlled at 170~180(℃), no preheating before welding, and no welding after welding heat treatment.

[0032] The mechanical properties of the butt joints welded by the above weldi...

Embodiment 2

[0034] Base material: Q500qE, thick plate combination 60mm+60mm. The size of the test plate is 600mm×400mm×60mm, the submerged arc welding groove adopts double-sided U symmetrical groove, the groove angle is 60°, the blunt edge is 7mm, and R7mm. Welding material matching: WQ-6 welding wire, flux is SJ101Q, and the mechanical properties of deposited metal are R el =542MPa, R m =630MPa, A=25%, Z=74%, -40℃KV 2 Impact energy = 143J. Butt joint welding with Q500qE steel (60mm+60mm) thick plate, welding material is WQ-6 welding wire, welding wire diameter Ф5.0mm; welding process specification: welding current 630 (A), welding voltage 31 (V), welding speed ~34 (cm / min), welding line energy 35 (kj / cm); submerged arc welding adopts multi-layer and multi-pass continuous welding, the temperature between layers is controlled at 190~210(℃), no preheating before welding, no post-welding Carry out heat treatment.

[0035] The mechanical properties of the butt joints welded by the above ...

Embodiment 3

[0037] Base material: Q500qE, thick plate combination 60mm+60mm. The size of the test plate is 600mm×400mm×60mm, the submerged arc welding groove adopts double-sided U symmetrical groove, the groove angle is 60°, the blunt edge is 7mm, and R7mm. Welding material matching: WQ-6 welding wire, flux is SJ101Q, and the mechanical properties of deposited metal are R el =542MPa, R m =630MPa, A=25%, Z=74%, -40℃KV 2 Impact energy = 143J. Butt joint welding with Q500qE steel (60mm+60mm) thick plate, welding material is WQ-6 welding wire, welding wire diameter Ф5.0mm; welding process specification: welding current 630 (A), welding voltage 31 (V), welding speed ~34 (cm / min), welding line energy 35 (kj / cm); submerged arc welding adopts multi-layer and multi-pass continuous welding, the temperature between layers is controlled at 190~210(℃), no preheating before welding, no post-welding Carry out heat treatment.

[0038] The mechanical properties of the butt joints welded by the above ...

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Abstract

A high-strength Q500qE bridge steel thick plate submerged-arc welding method includes the steps: applicable mechanical properties of base plates include ReL not smaller than 500MPa, Rm not smaller than 650MPa, elongation A not smaller than 18%, and -40oCKV2 impact power not smaller than 120J; thick plates are combined by welding under equal thickness of 50mm and 60mm, preheating is not performed before welding, and heat treatment is not performed after welding; submerged-arc welding grooves are double-side U-shaped symmetric grooves at 60-degree angle, root face R of each grove is 7mm; tensile strength of submerged-arc welding rods is not lower than 610MPa, the diameter phi of the submerged-arc welding rods is 5.0mm, and the submerged-arc welding rods are used with sintered flux SJ101Q; welding process parameters include current 630A, voltage about 31V, speed 34cm / min, energy input 35kJ / cm, and flux baking system 350 DEG C*1h; multi-layer multiple welding is performed continuously, and inter-layer temperature is not larger than 210 DEG C. The high-strength Q500qE bridge steel thick plate submerged-arc welding method is simple to operate, efficient, energy saving, and especially applicable to welding of large-span bridge steel thick plates.

Description

technical field [0001] The invention relates to a Q500qE high-strength bridge steel thick plate submerged arc welding butt welding process, which is suitable for welding tensile strength R m ≥650MPa level high-strength bridge engineering thick plate structural steel, which belongs to the field of long-span bridge thick plate manufacturing and welding technology. Background technique [0002] The proposed Hutong Yangtze River Bridge in my country is a long-span public and railway bridge with 6-line highway and 4-line railway. It will become the bridge with the largest span for road and railway in the world. In order to meet the requirements of high-strength, long-span, heavy-load, and high-speed development of bridge construction in my country, Wuhan Iron and Steel (Group) Company developed a new generation of high-strength, high-toughness bridge steel Q500qE for the bridge, and its comprehensive mechanical properties have reached The level of similar foreign steel grades, es...

Claims

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Application Information

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IPC IPC(8): B23K9/18
CPCB23K9/18B23K9/23B23K31/12B23K33/00B23K2101/18
Inventor 缪凯牟文广陈浮李立军黄治军胡因洪许颖胡家国王靓
Owner WUHAN IRON & STEEL (GROUP) CORP
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