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Preparation method of gas shielded welding wire

A technology for gas shielding and welding wire, which is applied in the field of preparation of gas shielded welding wire, can solve the problems of inability to meet welding requirements and decrease in strength, and achieve the effects of high strength, stable production process and improved mechanical properties.

Inactive Publication Date: 2014-05-07
无锡市华瑞渔机厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although its toughness has been improved to a certain extent, it still cannot meet the welding requirements of some steel types, and practice has shown that its strength has decreased to a certain extent. Therefore, this welding wire still needs further improvement.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for preparing a gas shielded welding wire, the welding wire is composed of the following components in weight percentage: C: 0.12%, Si: 0.60%, Mn: 0.40%, P≤0.015%, S≤0.010%, Nb: 0.09%, Ti: 0.04%, Ca: 0.035%; Ni: 1.1%, N: 0.0060%, O: 0.0020%, the rest is Fe and inevitable inclusions; the preparation method is:

[0016] 1) The cast slab with the above composition is made through hot metal desulfurization, converter top-bottom blowing, vacuum deep treatment and composition fine-tuning;

[0017] 2) Controlled rolling: the controlled rolling method is as follows: the starting rolling temperature is 1160°C, the cumulative reduction rate of the last three passes of controlled rolling is ≥35%, and the final rolling temperature is 900°C;

[0018] 3) Controlled cooling: Control the cooling speed of the welding wire to ≥6°C / s, air-cool the welding wire to room temperature, and then inspect and deliver.

Embodiment 2

[0020] A method for preparing a gas shielded welding wire, the welding wire is composed of the following components in weight percentage: C: 0.18%, Si: 0.40%, Mn: 0.50%, P≤0.015%, S≤0.010%, Nb: 0.07%, Ti: 0.06%, Ca: 0.015%; Ni: 1.3%, N: 0.0020%, O: 0.0060%, the rest is Fe and inevitable inclusions; the preparation method is:

[0021] 1) The cast slab with the above composition is made through hot metal desulfurization, converter top-bottom blowing, vacuum deep treatment and composition fine-tuning;

[0022] 2) Controlled rolling: the controlled rolling method is as follows: the starting rolling temperature is 1180°C, the cumulative reduction rate of the last three passes of controlled rolling is ≥35%, and the final rolling temperature is 880°C;

[0023] 3) Controlled cooling: Control the cooling speed of the welding wire to ≥6°C / s, air-cool the welding wire to room temperature, and then inspect and deliver.

Embodiment 3

[0025] A method for preparing a gas shielded welding wire, the welding wire is composed of the following components in weight percentage: C: 0.15%, Si: 0.50%, Mn: 0.45%, P≤0.015%, S≤0.010%, Nb: 0.08%, Ti: 0.05%, Ca: 0.025%; Ni: 1.2%, N: 0.0040%, O: 0.0040%, the rest is Fe and inevitable inclusions; the preparation method is:

[0026] 1) The cast slab with the above composition is made through hot metal desulfurization, converter top-bottom blowing, vacuum deep treatment and composition fine-tuning;

[0027] 2) Controlled rolling: the controlled rolling method is as follows: the starting rolling temperature is 1170°C, the cumulative reduction ratio of the last three passes of controlled rolling is ≥35%, and the final rolling temperature is 890°C;

[0028] 3) Controlled cooling: Control the cooling speed of the welding wire to ≥6°C / s, air-cool the welding wire to room temperature, and then inspect and deliver.

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PUM

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Abstract

The invention discloses a preparation method of a gas shielded welding wire. The gas shielded welding wire is composed of C, Si, Mn, P, S, Nb, Ti, Ca, Ni, N, O and Fe. The preparation method comprises 1) obtaining a casting blank composed of the component above through molten iron desulphurization, converter top and bottom blowing, vacuum deep processing and composition fine adjustment; 2) rolling control including controlling the rolling start speed to be 1160-1180 DEG C, the rolling control tail three-stage accumulative reduction rate to be larger than or equal to 35% and the finishing rolling temperature to be 880-900 DEG C; 3) cooling control including controlling the cooling speed of the welding wire to be larger than or equal to 6 DEG C / s to cool the welding wire to room temperature for inspection and delivery. By means of reasonable composition and proportion and low-alloy-element design, the welding wire is provided with excellent strength and toughness matching. When the welding wire is used for welding, welding joints can be provided with a high strength (Rm >= 750 MPa) and an excellent low-temperature toughness (-20 DEG C Akv >= 200 J).

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for preparing a gas shielded welding wire. Background technique [0002] Gas shielded welding is easy to automate, has high welding wire deposition rate and good weld shape, so it is widely used. With the increasing toughness required by modern pipelines, pressure vessels, and bridge steel, the performance of welded joints must also match it. The weld structure generally contains proeutectoid ferrite, acicular ferrite, bainite, martensite, etc. With the increase of alloying elements, proeutectoid ferrite decreases and acicular ferrite increases until Bainite, martensite, etc. appear. The weld has the characteristics of cast state, and its strengthening and toughening is mainly achieved by alloying. With the increase of alloying elements in the weld, the strength of the weld increases and the toughness of the weld generally decreases. In order to imp...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/0261B23K35/3066B23K35/40
Inventor 刘德仁
Owner 无锡市华瑞渔机厂
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