Submerged-arc welding process for T-type joint for extra thick steel plate

A technology of super-thick steel plate and submerged arc welding, which is applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of easy occurrence of thermal cracks, high labor intensity, undercutting, etc., and reduce the deterioration of mechanical properties and reduce the Labor intensity, the effect of improving welding efficiency

Active Publication Date: 2011-11-16
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a submerged-arc welding process for T-joints of extra-thick steel plates, which solves the problem of low manual priming efficiency and high labor intensity during welding of T-joints of extra-thick steel plates. problems such as undercut, mechanical slag inclusion, and large workload of root cleaning on the reverse side; by selecting the appropriate groove form, welding sequence, welding process parameters and slow cooling measures, it is easy to remove slag in the filled bead, reduce the workload of root cleaning, and reduce the Small welding deformation, reduce welding residual stress, and ensure weld quality

Method used

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  • Submerged-arc welding process for T-type joint for extra thick steel plate

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Effect test

Embodiment 1

[0018] Base material: 80mm thick E550 steel plate produced by quenching and tempering process, the mechanical properties are: yield strength 710MPa, tensile strength 730MPa, elongation 20.0%, impact energy at -40°C 197J. The test plate has a symmetrical K-shaped groove, the groove angle is 45°, the steel plate size is 1200mm×200mm×80mm, no blunt edge is left, and there is no gap between the two plates.

[0019] Welding material matching: use OK Autrod 13.40 submerged arc welding wire with OK Flux 10.62 flux produced by Sweden ESAB company with a diameter of 4mm.

[0020] The 80mm+80mm thick E550 steel plate is preheated to 120°C with a flame before welding, the interlayer temperature is controlled at 120-150°C, the groove is polished with a grinder before welding, and the submerged arc welding is used for bottoming , filling, covering.

[0021] The welding current of the bottom pass is controlled at 450-500A, the welding voltage is controlled at 24-27V, and the welding speed ...

Embodiment 2

[0025] Base material: 50mm thick E500 steel plate produced by TMCP + tempering process, the mechanical properties are: yield strength 560MPa, tensile strength 675MPa, elongation 23.5%, impact energy at -40°C 268J. The test plate has a symmetrical K-shaped groove, the groove angle is 50°, the steel plate size is 1200mm×200mm×80mm, no blunt edge is left, and a gap of 1mm is left between the two plates.

[0026] Welding material matching: use OK Autrod 12.34 submerged arc welding wire and OK Flux 10.62 flux produced by Sweden ESAB company with a diameter of 4mm for welding.

[0027] Preheat the 50mm+50mm thick E550 steel plate to 100°C with a flame before welding, control the interlayer temperature at 100-150°C, grind the groove with a grinder to see the light before welding, and use submerged arc welding to make the bottom , filling, covering.

[0028] The welding current of the bottom pass is controlled at 450-500A, the welding voltage is controlled at 24-26V, and the welding ...

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Abstract

The invention discloses a submerged-arc welding process for a T-type joint for an extra thick steel plate and belongs to the technical field of welding of extra thick plates. The process comprises the following steps of: before welding, pre-heating the extra thick steel plate to 100 to 150 DEG C; removing pollutants of oxides, greasy dirt and the like on the surface of the groove of the extra thick steel plate; bottoming the extra thick steel plate by submerged-arc welding; forming systematical grooves and after the front face of the extra thick steel plate is bottomed, welding and filling; performing back gouging on the reverse side of the extra thick steel plate and welding and filling the reverse side; and filling welding wires on the front side of the extra thick steel plate and covering the side. The problems that manual bottoming efficiency is low, labor intensity is high, and heat cracking, undercutting, mechanical slag inclusion, large working amount of back gouging of the reverse side and the like are easily caused by submerged-arc welding bottoming when the T-type joint of the extra thick plate of which the thickness is 50 to 150mm is welded are solved; by the selection of an appropriate groove form, the welding sequence, and welding process parameters, and slow cooling measures, slag is easy to clean in a filling weld pass, the working amount of back gouging is reduced, the welding deformation is reduced, the welding residual stress is reduced and the quality of a weld joint is guaranteed; and the submerged-arc welding process is easy to operate and implement, and is convenient to popularize.

Description

technical field [0001] The invention belongs to the technical field of extra-thick plate welding, and in particular relates to a submerged-arc welding process for T-shaped joints of extra-thick steel plates. Background technique [0002] T-joints of extra-thick plates are widely used in the field of engineering construction and welding certification of ship plates and marine steel classification societies. Submerged arc welding, as an efficient welding method, is also widely used in the welding of long and straight welds. When manual welding is used for the bottoming weld of T-joints of extra-thick plates, the technical level of the welders is high, the labor intensity is huge, and the production efficiency is low. The seam quality is stable, but it is prone to difficulty in slag removal, large root cleaning workload and welding defects such as undercut, mechanical slag inclusions, thermal cracks, etc., which will reduce efficiency and weld quality. The extra-thick plate ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K9/235
Inventor 张熹陈延清郭占山刘宏章军鞠建斌董现春许良红张楠张飞虎
Owner SHOUGANG CORPORATION
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