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GMAW-Ar welding method for Q420B steel plate

A Q420B, welding method technology, applied in welding media, welding equipment, welding equipment, etc., can solve the problems of unstable welding performance, prone to laminar tearing, and impact on weld performance, so as to reduce welding stress and avoid cold. Cracks and lamellar tearing tendencies, avoiding the effect of hardened martensite

Inactive Publication Date: 2019-02-19
GUANGZHOU ZENGLI STEEL STRUCTURE
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Problems solved by technology

[0003] However, due to the addition of strong carbide-forming elements such as V, Ti, and Nb in Q420B low-alloy high-strength structural steel, it affects the performance of the weld and makes its welding performance not stable enough.
Since the content of each alloy element in the steel has slight changes in each batch, the carbon equivalent of Q420B also has slight changes, the range of which is between 0.45-0.47, and the welding difficulty belongs to C level. From the perspective of welding performance, Q420B It is more difficult to weld; from the analysis of the plate thickness of the components, the greater the plate thickness, the worse the performance of the steel plate in the Z direction, and the greater the welding shrinkage of the thick plate. Therefore, the Q420B steel plate is prone to lamellar tearing tendency during welding. lead to poor welding effect

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  • GMAW-Ar welding method for Q420B steel plate
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Embodiment Construction

[0030] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0031] like figure 1 and figure 2 Shown, the GMAW-Ar welding method of the Q420B steel plate of the present invention comprises the following steps:

[0032] S1: Groove preparation: make an asymmetrical X-shaped groove on the test piece, and reserve a blunt edge of 0-2 mm; the angle of the deep groove is 50°, and the angle of the shallow groove is 60°; the height of the deep groove is 2 / 3tmm, the shallow groove height is 1 / 3tmm; among them, t / mm is the thickness of the test piece.

[0033] S2: Grinding the joint: use a grinder to grind the groove surface and the groove periphery within 20 mm to remove rust, oil, scale, and water, so that the test piece revea...

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Abstract

The invention provides a GMAW-Ar welding method for a Q420B steel plate. The GMAW-Ar welding method for the Q420B steel plate comprises the following steps: S1: making asymmetric X-shaped grooves in specimens, S2: grinding the groove surface and the periphery of the grooves within 20 mm with a grinding wheel machine, S3: assembling the ground specimens, S4: position welding the assembled specimens, S5: preheating the specimens by a flame heating method before welding, S6: welding the bottom by adopting the GMAW-Ar method, S7: carrying out welding through the GMAW-Ar method, S8: cleaning root of a bottom welding pass by carbon arc air gouging, S9: controlling the interlayer temperature between 150 and 200 DEG C by the flame heating method, S10: cleaning up slag and spatter during welding, and S11: detecting flaw. The GMAW-Ar welding method for the Q420B steel plate can effectively control the cold crack and the laminar tearing tendency and improve the welding quality.

Description

technical field [0001] The invention relates to a welding method, in particular to a GMAW-Ar welding method for a Q420B steel plate. Background technique [0002] Q420BB is a low-alloy high-strength structural steel. With the development of my country's industry, new high-strength structural steel represented by Q420B is widely used in the production and construction of building steel structures and large-span steel pipe towers for transmission lines. The difficulty of welding in steel structure engineering can be divided into four difficulty levels from A to D according to the carbon equivalent of steel in GB / 50661-2011. Usually, the weldability of steel is judged according to the carbon equivalent of steel. The greater the carbon equivalent of steel, the more The greater the tendency of weld cold cracks, the worse the welding performance, and the welding difficulty is relatively greater. [0003] However, due to the addition of strong carbide-forming elements such as V, T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/173B23K9/235B23K33/00B23K35/38B23K103/04B23K101/18
CPCB23K9/173B23K9/235B23K33/004B23K35/383
Inventor 张帝起张洋
Owner GUANGZHOU ZENGLI STEEL STRUCTURE
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