Non-back gouging submerged-arc welding method of H-shaped steel

A technology of H-beam and submerged arc welding, which is applied in arc welding equipment, welding equipment, workpiece edge parts, etc., can solve the problems of low welding efficiency and poor welding quality, reduce the loss of welding materials, reduce the amount of milling, and is suitable for wide range of effects

Inactive Publication Date: 2015-04-22
SHANGHAI HULIN HEAVY IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of low welding efficiency and poor welding quality, and utilize pulsed arc excavation for the above-mentioned current H-beam free-cutting welding process to meet the needs of web welding with a thickness of 14mm and above without root-cutting. characteristics, a low cost, good applicability, and high welding efficiency submerged arc welding method for H-shaped steel without root cleaning is proposed, so as to improve the quality of the weld seam, increase the penetration depth of the weld seam, and avoid the process of root cleaning

Method used

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  • Non-back gouging submerged-arc welding method of H-shaped steel
  • Non-back gouging submerged-arc welding method of H-shaped steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this example, the thickness of the H-shaped steel plate is 16mm, the material of the base metal is Q235B, the welding wire used is H08A, the diameter of the welding wire is 5mm, and the flux is SJ101, which requires full penetration and root cleaning welding.

[0038] see figure 1 , adopt the method of the present invention to comprise the following steps:

[0039] Preparation before welding:

[0040] 1) Make a K-shaped symmetrical bevel on the web 2, the bevel angle is 70°, and the blunt edge 3 is 14mm;

[0041] 2) Remove the scale, rust and oil on the groove surface and near the weld, and polish it smoothly;

[0042] 3) Group pair, control the gap between the group pair to 0.5mm, and at the same time ensure that the axis of welding wire 5 is aligned with the center of the gap, the axis of welding wire 5 is perpendicular to the horizontal plane, and spot weld the web 2 and wing 1;

[0043] 4) Carry out grinding treatment on the tack welding place, with reference ...

Embodiment 2

[0052] In this example, the thickness of the H-shaped steel plate is 14mm, the material of the base metal is Q235B, the welding wire used is H08A, the diameter of the welding wire is 5mm, and the flux is SJ101, which requires full penetration and root cleaning welding.

[0053] see figure 1 , adopt the method of the present invention to comprise the following steps:

[0054] Preparation before welding:

[0055] 1) Make a K-shaped symmetrical bevel on the web 2, the bevel angle is 68°, and the blunt edge 3 is 12mm;

[0056] 2) Remove the scale, rust and oil on the groove surface and near the weld, and polish it smoothly;

[0057] 3) Group pairs, control the gap between the groups to be 0 mm, and at the same time ensure that the axis of the welding wire 5 is aligned with the center of the gap, the axis of the welding wire 5 is perpendicular to the horizontal plane, and spot weld the web 2 and the wing 1;

[0058] 4) Carry out grinding treatment on the tack welding place, with...

Embodiment 3

[0066] In this example, the thickness of the H-shaped steel plate is 18mm, the base material is Q235B, the welding wire used is H08A, the diameter of the welding wire is 5mm, and the flux is SJ101, which requires full penetration without root cleaning.

[0067] see figure 1 , adopt the method of the present invention to comprise the following steps:

[0068] Preparation before welding:

[0069] 1) Make a K-shaped symmetrical bevel on the web 2, the bevel angle is 72°, and the blunt edge 3 is 16mm;

[0070] 2) Remove the scale, rust and oil on the groove surface and near the weld, and polish it smoothly;

[0071] 3) Group pairs, control the gap between the group pairs to be 1 mm, and at the same time ensure that the axis of the welding wire 5 is aligned with the center of the gap, the axis of the welding wire 5 is perpendicular to the horizontal plane, and spot weld the web 2 and the wing 1;

[0072] 4) Carry out grinding treatment on the tack welding place, with reference t...

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Abstract

The invention discloses a non-back gouging submerged-arc welding method of H-shaped steel. The method comprises a web beveling step, a step of removing scales, rusts and oil stains on the surface of a groove and near a welding line, a step of assembling, controlling an assembling gap and performing the spot welding for a web and a wing plate, a positioned welding treatment step, a step of putting the H-shaped steel on an H-shaped steel welding mold and a welding step, wherein in the web beveling step, a K-shaped groove is formed in a web with a thickness of 14 mm and more, a truncated edge of the web is not smaller than 12 mm, and the bevel angle is 70+- 2 degrees; in the welding step, a pulse current function is added, and reasonable matched use adjustable parameters are a current basic value of 350-400 A, a current peak value of 800-1000 A, a pulse duty factor of 60-70%, a pulse frequency of 1-1.5 Hz, voltage of 30-35 V and a welding speed of 380-410 mm/min; and the welding sequence of the welding line is as follows: the submerged-arc welding is performed for the frontal surface and the overturned diagonal plane at the two sides of the web according to the diagonal staggered sequence. The method increases the melting depth of the welding line, improves the quality of the welding line, omits a carbon arc gouging back gouging procedure, and has the advantages of low cost, good adaptability and high welding efficiency.

Description

technical field [0001] The invention relates to a section steel welding method, in particular to a root cleaning-free submerged arc welding method for welding H-section steel with a web thickness greater than or equal to 14 mm, and belongs to the field of welding technology. Background technique [0002] In the production of H-shaped steel, when welding webs with a thickness greater than or equal to 14mm and full penetration welding requirements, the traditional method usually adopts small blunt edges, gas shielded welding for bottoming, submerged arc welding for filling and covering, and carbon arc gouging for cleaning. The process of submerged arc welding of the root and back welds to ensure the welding quality of the root of the weld. [0003] Carbon arc gouging is a commonly used method in the steel structure industry at present. It can be used for all-position root cleaning, which is convenient for removing root defects of welds, but it also has disadvantages: 1) Smoke,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K9/025B23K9/235B23K33/00
CPCB23K9/18B23K9/025B23K9/235B23K33/004
Inventor 周方明吴兴祥王伟建陆炜
Owner SHANGHAI HULIN HEAVY IND
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