Method for welding specially-thick high-strength bridge steel plate

A welding method and bridge technology are applied in the welding of low-alloy high-strength steel extra-thick plates, and the welding of extra-thick and high-strength bridge steel plates, which can solve the problems of difficult control of welding deformation of extra-thick plates, low welding efficiency, and easy occurrence of cold cracks. , to avoid reheat embrittlement, improve welding efficiency, and avoid reheat cracks

Inactive Publication Date: 2012-10-24
SHOUGANG CORPORATION
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AI-Extracted Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a welding method for extra-thick and high-strength bridge steel plates, which solves welding defects such as cold cracks and reheat cracks that are prone to...
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Abstract

The invention provides a method for welding a specially-thick high-strength bridge steel plate and belongs to the technical field of specially-thick plate welding. The test plate of the method adopts a symmetric narrow gap U-shaped groove form, is combinedly welded by using two efficient welding methods, namely gas shielded welding for priming and bottom filling, and double-wire submerged arc welding for continuous filling and finishing, so as to achieve the purposes of reducing filling level and giving full play to the efficient double-wire submerged arc welding and high automation degree. The method has strong operability, greatly improves the welding efficiency of the specially-thick bridge steel plate, and significantly reduces manpower cost. Furthermore, by selecting a proper welding sequence, the method solves the problem that the welding deformation of the specially-thick steel plate is hard to control.

Application Domain

Arc welding apparatusWorkpiece edge portions

Technology Topic

Image

  • Method for welding specially-thick high-strength bridge steel plate
  • Method for welding specially-thick high-strength bridge steel plate
  • Method for welding specially-thick high-strength bridge steel plate

Examples

  • Experimental program(2)

Example Embodiment

[0024] Example 1:
[0025] Base material: 100mm thick Q370qE bridge steel plate produced by hot-rolled + normalizing process, yield strength 380MPa, tensile strength 530MPa, elongation 32%, impact energy at -40°C at 1/4 plate thickness, 263J, plate thickness 1/2 The impact energy is 233J at -40℃, the thickness of the welded steel plate is 100mm+100mm, the size of the test plate is 600mm×220mm×100mm, and the groove form is shown in the attachment figure 1 Shown
[0026] Welding material: gas shielded welding wire diameter Φ1.2mm, cladding metal mechanical properties: yield strength 525MPa, tensile strength 595MPa, elongation 27%, -40℃ impact energy 76J; submerged arc welding wire diameter Φ5mm, cladding metal mechanical properties It is: the yield strength is 450MPa, the tensile strength is 560MPa, the elongation is 30%, and the impact energy is 125J at -40°C.
[0027] Welding process: Use mechanical treatment to clean the groove surface before welding to remove oil and rust; preheat 150℃ before welding, and control the interlayer temperature at 150~200℃; gas shielded welding welding process parameters: welding current 230~ 240A, welding voltage 29~31V, welding speed 3.5~4mm/s, welding heat input 20~23kJ/cm; welding process parameters of double wire submerged arc welding: 1 wire, 2 wires spacing 35mm, 2 wires 10° to the vertical , 1 wire welding current 690~710A, 1 wire welding voltage 28~30V, 2 wire welding current 550~600A, 2 wire voltage 34~36V, welding speed 13~14mm/s, total welding heat input 33~35kJ/cm; First, the welding surface is filled with gas shielded welding to 20mm in the center, then the other side is cleaned, and the back welding surface is filled with gas shielded welding + double-wire submerged arc welding, and then the first welding surface is filled with double-wire submerged arc welding ; After welding, use aluminum silicate plate to cover the welded joint for slow cooling.
[0028] 100mm thick bridge steel welded by the above process, the mechanical properties of the welded joint: yield strength 385MPa, tensile strength 537MPa, broken at the base metal; 1/2 thickness of the plate: welding seam -40℃ impact energy 74J, heat affected zone -40 ℃ impact energy 108J; 1/4 plate thickness: welding seam -40℃ impact energy 98J, heat affected zone -40℃ impact energy 189J.

Example Embodiment

[0029] Example 2:
[0030] Base material: 150mm thick Q370qE bridge steel plate produced by hot-rolled + normalizing process, yield strength 375MPa, tensile strength 520MPa, elongation 30%, impact energy at -40°C at 1/4 thickness, 227J, thickness 1/2 The impact energy is 207J at -40℃, the thickness of the welded steel plate is 150mm+150mm, the size of the test plate is 600mm×220mm×100mm, and the groove form is shown in the attachment figure 2 Shown
[0031] Welding material: gas shielded welding wire diameter Φ1.2mm, cladding metal mechanical properties: yield strength 525MPa, tensile strength 595MPa, elongation 27%, -40℃ impact energy 76J; submerged arc welding wire diameter Φ5mm, cladding metal mechanical properties It is: the yield strength is 450MPa, the tensile strength is 560MPa, the elongation is 30%, and the impact energy is 125J at -40°C.
[0032] Welding process: Before welding, mechanical treatment is used to clean the groove surface to remove oil stains and rust; preheat 150℃ before welding, and the temperature between layers is controlled at 150~200℃; gas shielded welding welding process parameters: welding current 260~ 270A, welding voltage 30~32V, welding speed 4~4.5mm/s, welding heat input 25~27kJ/cm; double wire submerged arc welding process parameters: 1 wire, 2 wires spacing 35mm, 2 wires and the vertical direction is 10 °, 1 wire welding current 700~720A, 1 wire welding voltage 29~31V, 2 wire welding current 580~620A, 2 wire voltage 34~36V, welding speed 12~13mm/s, total welding heat input 35~40kJ/cm ; First, the welding surface is filled with gas shielded welding to the center 30mm, then the other side is cleaned, and the back welding surface is filled with gas shielded welding + double-wire submerged arc welding, and then the first welding surface is filled with double-wire submerged arc welding Full; After welding, use aluminum silicate plate to cover the welded joint for slow cooling.
[0033] The 150mm thick bridge steel welded by the above process, the mechanical properties of the welded joint: yield strength 380MPa, tensile strength 515MPa, broken at the base metal; 1/2 thickness of the plate: welding seam -40℃ impact energy 65J, heat affected zone -40 ℃ impact energy 92J; 1/4 plate thickness: welding seam -40℃ impact energy 83J, heat-affected zone -40℃ impact energy 127J.
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PUM

PropertyMeasurementUnit
Yield strength>= 370.0MPa
Tensile strength>= 510.0MPa
Impact energy>= 41.0J
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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