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Protecting welding process with mixed Ar plus CO2 gas

A technology of mixed gas and shielded welding, which is applied in metal processing equipment, welding media, manufacturing tools, etc., can solve the problems of affecting the internal quality of the weld, more alloying element burning loss, and large welding spatter particles, etc., to improve the welding seam Effects of appearance quality, less spatter rate, and shorter cleaning time

Inactive Publication Date: 2007-08-22
SICHUAN DONGFENG ELECTRIC MACHINARY WORKS CO LTD
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AI Technical Summary

Problems solved by technology

[0002] The current welding process of C02 gas shielded welding, in the welding process, the welding spatter particles are large, the utilization rate of the welding wire is not high, and the welding slag is distributed on the entire surface of the weld bead. If it is not cleaned, it will seriously affect the internal quality of the weld. At the same time, due to the certain oxidation of C02 gas, the alloy elements in the weld metal burn more, forming certain oxides, and the tensile strength of the weld is high
Taking the welding of the Malan III volute as an example, C02 gas shielded welding is used, and the welding is performed by a qualified electric welder. However, after 100% radiographic inspection of the weld, it is found that there are certain welding defects in the weld - slag inclusion, etc.

Method used

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Examples

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Effect test

Embodiment 1

[0007] Example 1: Test materials and welding equipment: base metal: 16Mn, welding wire: H08Mn2SiA φ1.2, shielding gas: 80% Ar plus 20% C02 and C02 gas, welding equipment: NB-500

[0008] Ar plus CO 2 The mixed gas shielded welding process, which includes the following steps: (1) Select the arc voltage: the arc voltage plays an important role in the melting depth of the groove, the arc voltage increases, the melting depth of the two sides of the groove increases, but the voltage is too large , the two sides of the groove will produce undercuts, and even cause defects such as slag inclusions. If the voltage is too low, the heating of the two sides of the groove will be weakened, and the weld bead will be raised. Therefore, the selected arc voltage is 20-26V; (2 ) Selection of welding current: The welding current determines the metal deposition rate, the stability of the arc, the weld shape and the droplet transition state. If the current is too large, the molten pool will be de...

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Abstract

The protected welding process with mixed Ar plus CO2 gas includes the following steps: selecting arc voltage in 20-26 V; selecting welding current in 200-230 A; selecting gas flow rate in 15-20 l / min; connecting to power source in correct polarity; selecting wire feeding speed in 5.25 m / min; determining wire extending length of 15 mm; feeding wire in equal speed; and continuously welding. The present invention has the advantages of excellent welding performance, lowered welding material consumption, high welding quality, etc. and may be used in welding rotor rack, machine foundation, etc.

Description

technical field [0001] The invention relates to a mixed gas shielded welding process for metal structural parts, especially Ar plus CO 2 Mixed gas shielded welding process. Background technique [0002] The current welding process of C02 gas shielded welding, in the welding process, the welding spatter particles are large, the utilization rate of the welding wire is not high, and the welding slag is distributed on the entire surface of the weld bead. If it is not cleaned, it will seriously affect the internal quality of the weld. , At the same time, due to the certain oxidation of C02 gas, the alloy elements in the weld metal burn more, forming certain oxides, and the tensile strength of the weld is high. Taking the welding of the Malan III volute as an example, C02 gas shielded welding is used, and the welding is performed by a qualified electric welder. However, after 100% radiographic inspection of the weld, it is found that there are certain welding defects in the weld ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/095B23K35/38
Inventor 王文军
Owner SICHUAN DONGFENG ELECTRIC MACHINARY WORKS CO LTD
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