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Gas protection solid welding wire for 1000 MPa high-strength steel welding and preparing and welding methods of gas protection solid welding wire

A technology of solid welding wire and welding method, applied in the direction of welding equipment, welding equipment, welding medium, etc., to achieve the effects of good arc stability, beautiful weld shape, and excellent welding process performance

Active Publication Date: 2017-01-11
SICHUAN XIYE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Carrying out research on the key technologies mentioned above is extremely challenging, groundbreaking, and of great significance

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0039] This embodiment discloses a gas-shielded solid welding wire for welding 1000MPa high-strength steel. The chemical composition of the welding wire includes: C: 0.07-0.13%, Si: 0.3-0.5%, Mn: 1.8-2.3%, Ni: 2.7-3.2%, Cr: 0.3-1.2%, Mo: 0.4-0.85%, Ti: 0.01-0.1%, Al: 0.01-0.03%, P: less than 0.008%, S: 0.005%-0.010%, Cu: 0.3 % or less, Nb: 0.01-0.035%, and the balance is Fe.

[0040] Further, the preparation method steps of the 1000MPa high-strength steel welding gas-shielded solid welding wire of the above-mentioned embodiment are as follows:

[0041] Desulfurized molten iron is used to control the sulfur content of molten iron entering the furnace. Intermediate frequency induction furnace is used to make steel, and raw materials with low content of impurity elements are selected to control the C, S and P at the end of smelting at a low level. After deoxidation and alloying, LF is used Furnace and other refining processes outside the furnace plus vacuum degassing to smelt mo...

Embodiment 2

[0043] The chemical composition of a gas-shielded solid welding wire for welding 1000MPa high-strength steel disclosed in this embodiment includes: C 0.09%, Mn 1.82%, Si 0.4%, Cr 0.7%, Mo 0.65%, Ni 2.80%, Ti0. 05%, Cu 0.25%, Al 0.015%, S 0.006%, P 0.004%, and the balance is iron and unavoidable impurities.

[0044] The welding method of the 1000MPa high-strength steel welding gas-shielded solid welding wire welding deposited metal described in the present embodiment comprises the following steps: adopt 80%Ar+20%CO 2 The argon-rich mixed gas is used for deposited metal welding. The test plate is Q235 (heap edge), the thickness is 20mm, the groove angle is 25°, and the root gap is 16mm. The welding specification is: welding current 230-270A, welding voltage 28-31V, welding speed 25-30cm / min, gas flow 20L / min, interlayer temperature 130-150℃. Yield strength of deposited metal б s =940MPa, tensile strength б b = 1060MPa, elongation of deposited metal = 17%, impact energy KV of ...

Embodiment 3

[0048] The chemical composition of a 1000MPa high-strength steel welding gas-shielded solid wire disclosed in this embodiment includes: C 0.10%, Mn 2.05%, Si 0.35%, Cr 0.8%, Mo 0.10%, Ni 3.05%, Ti0. 02%, Cu 0.15%, Al 0.018%, S 0.004%, P 0.006%, and the balance is iron and unavoidable impurities.

[0049] The welding method of the 1000MPa high-strength steel welding gas-shielded solid welding wire welding deposited metal described in the present embodiment comprises the following steps: adopt 80%Ar+20%CO 2 Argon-rich mixed gas is used for welding deposited metal. The material, specification, groove angle, preheating temperature, and welding process of the test plate are the same as those in Example 1. The yield strength of the deposited metal is б s =960MPa, tensile strength б b = 1080MPa, elongation of deposited metal = 18%, impact energy KV of deposited metal at -20°C 2 = 60J.

[0050] The welding method of the 1000MPa high-strength steel welding gas-shielded solid wire we...

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Abstract

The invention discloses a gas protection solid welding wire for 1000 MPa high-strength steel welding and preparing and welding methods of the gas protection solid welding wire. Chemical ingredients of the welding wire include, by weight, 0.07-0.13 part of C, 0.3-0.5 part of Si, 1.8-2.3 parts of Mn, 2.7-3.2 parts of Ni, 0.3-1.2 parts of Cr, 0.4-0.85 part of Mo, 0.01-0.1 part of Ti, 0.01-0.03 part of Al, 0.008 part or below of P, 0.005-0.010 part of S, 0.3 part or below of Cu, 0.01-0.035 part of Nb and the balance Fe. The welding wire can replace an imported welding wire, the construction cost of high-strength steel for large hydropower stations, water pumping and energy storage power stations and the like can be remarkably reduced, and remarkable economic benefits and social benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of welding materials, in particular to a gas-shielded solid welding wire for welding 1000MPa high-strength steel and its preparation and welding method, which is suitable for metals of corresponding strength levels and used for all-position welding. Background technique [0002] my country's conventional energy is dominated by coal and water energy, and water energy resources are second only to coal, occupying a very important position. my country's hydropower construction has achieved remarkable results. At present, there are 33 large-scale high-head hydropower projects that have been or will be built on the upper reaches of the Yangtze River, the Jinsha River, and the Dadu River. Among the hydropower stations with a capacity of more than 5 million kW, there are Xiangjiaba, Xiluodu, Baihetan, Wudongde, and Longpanxia. Wait. With the continuous increase of my country's electricity load, based on the need t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40B23K9/16
Inventor 康丹丹王高见朱藤辉刘丽
Owner SICHUAN XIYE NEW MATERIAL
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