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High intensity bridge steel manual welding technique method

A manual welding and process technology, applied in welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve the problem of no preheating, and achieve simple process, high impact toughness reserve and safety margin, excellent low temperature Effect of impact toughness and crack resistance

Inactive Publication Date: 2008-12-31
武钢集团有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to propose a high-strength bridge steel manual welding process, which mainly solves the problem of welding large-span high-strength bridge steel thick plates on-site butt welds without preheating before welding and without heat treatment after welding The material matching of the welding process method and the matching of the welding process meet the requirements of the low-temperature toughness of the joint, especially the third zone of the weld joint -40℃ A KV Impact energy requirements

Method used

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Experimental program
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Effect test

Embodiment 1

[0027] Substrate: steel plate produced by thermomechanical controlled rolling process (TMCP) + tempering, thick plate combination 32mm+32mm; the mechanical properties of the steel plate with a thickness of 32mm are: yield strength R eL : 495MPa, tensile strength R m : 585MPa, Elongation A: 23%, -40℃CA KV Impact energy: 269J. The size of the test plate is 600mm×400mm×32mm; the manual welding groove adopts X-shaped symmetrical groove, and the groove size is shown in figure 1 As shown, δ=32mm, groove angle is 60°, blunt edge H=2mm.

[0028] Welding material matching:

[0029] Manual electrode: The chemical composition and weight percentage of the deposited metal are: C 0.041, Si 0.35, Mn1.20, Ni 1.20, Mo 0.21, P≤0.013, S 0.004, and the rest are iron and unavoidable impurities; the diameter of the manual electrode is Φ4.0mm, the mechanical properties of the welding rod deposited metal is R el =560MPa, R m =645MPa, A=27%, impact energy A KV (-40°C) = 144J.

[0030] Welding ...

Embodiment 2

[0034] Substrate: steel plate produced by thermomechanical controlled rolling process (TMCP) + tempering, thick plate combination 50mm+50mm; the mechanical properties of the steel plate with a thickness of 50mm are: yield strength R eL : 540MPa, tensile strength R m : 635MPa, Elongation A: 21%, -40℃CA KV Impact energy: 188J. The size of the test plate is 600mm×400mm×50mm; the manual welding groove adopts X-shaped symmetrical groove, and the groove size sees figure 1 As shown, δ=50mm, groove angle is 60°, blunt edge H=2mm.

[0035] Welding material matching:

[0036] Manual electrode: The chemical composition and weight percentage of the deposited metal are: C 0.048, Si 0.38, Mn1.30, Ni 1.35, Mo 0.23, P≤0.013, S 0.003, and the rest are iron and unavoidable impurities; the diameter of the manual electrode is Φ4.0mm;

[0037] Welding process parameters are: welding current 170(A), welding voltage 25(V), welding speed 15cm / min, welding heat energy 17kJ / cm, electrode baking syst...

Embodiment 3

[0041] Base material: steel plate produced by thermomechanical controlled rolling process (TMCP) + tempering, thick plate combination 60mm+60mm; the mechanical property of the steel plate with a thickness of 60mm is the yield strength R eL : 495MPa, tensile strength R m : 620MPa, Elongation A: 24.5%, -40℃CA KV Impact power: 257J. The size of the test plate is 600mm×400mm×60mm; the manual welding groove adopts X-shaped symmetrical groove, and the groove size sees figure 1 As shown, δ=60mm, groove angle is 60°, blunt edge H=2mm.

[0042] Welding material matching:

[0043] Manual electrode: The chemical composition and weight percentage of the deposited metal are: C 0.051, Si 0.40, Mn1.50, Ni 1.50, Mo 0.24, P≤0.013, S 0.004, and the rest are iron and unavoidable impurities; the diameter of the manual electrode is Φ4.0mm;

[0044] Welding process parameters are: welding current ~ 165 (A), welding voltage ~ 26 (V), welding speed ~ 15cm / min, welding heat energy ~ 17kJ / cm, elec...

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Abstract

The invention provides a manual welding process method of high strength bridge steel. The manual welding process method comprises the steps as follows: (1) the bridge steel with the tensile strength of 570-650MPa and the thickness of 32-60mm is taken as a base material for welding; the matching welding materials are as follows: the tensile strength of a manual electrode is 590-650MPa and the diameter Phi of the electrode is 4.0mm; (2) a groove is an X-shaped symmetrical groove and the groove angle is 60 degrees, the root face is 2mm; (3) the welding process parameters are as follows: the welding current is 165-170A, the welding voltage is 26-25V, the welding speed is 17-15cm / min, the weld line energy is 15-17kJ / cm and the baking system of the electrode is 350 DEG C multiplied by 1h; (4) the manual welding adopts continuous multilayer and multipass welding, the interlayer temperature is controlled within 100-150 DEG C. The manual welding process method of the invention is characterized by good welding process performance, simple operation, convenient use, high efficiency and energy conservation, and adaptation to the welding of steel for wide-span and high-strengthen bridge structure. The manual welding process method has excellent welding seam crack resistance, and three joint areas have relatively high impact toughness reserve and safety margin.

Description

technical field [0001] The invention relates to a high-strength bridge steel manual welding process, which is used for welding tensile strength R m ≥570MPa low-alloy high-strength bridge steel, suitable for manual welding butt welding process in the manufacture of long-span bridge structures, which belongs to the field of welding technology for the manufacture of long-span bridge structures. Background technique [0002] As the overall design of bridges in our country gradually develops towards high strength, large span, heavy load and high speed. 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, For example, the Nanjing Dashengguan Bridge, the high-speed railway bridge with the largest design load in the worl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/02B23K33/00B23K9/095B23K101/28
Inventor 缪凯刘吉斌黄治军王玉涛牟文广胡因洪陈浮余酒泉周运武
Owner 武钢集团有限公司
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