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MAG welding steel wire and MAG welding method using same

A welding method and steel wire technology, applied in welding equipment, welding medium, welding equipment, etc., can solve the problems of lack of research on metal wire components, insufficient arc stability, etc.

Inactive Publication Date: 2003-10-15
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in these welding methods, the stability of the arc is not sufficient, and also the composition of the wire has not been studied

Method used

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  • MAG welding steel wire and MAG welding method using same
  • MAG welding steel wire and MAG welding method using same
  • MAG welding steel wire and MAG welding method using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] The billet produced by continuous casting and hot rolling is made into a wire rod with a diameter of 5.5-7.0 mm, and then wire drawing is carried out under a cold condition to make a steel wire with a diameter of 2.0-2.8 mm. A 2-30 mass % tripotassium citrate aqueous solution is coated on the steel wire. The coating amount of tripotassium citrate aqueous solution is 30-50g in every 1kg steel wire. Next, the dew point of the steel wire: below -2°C, O 2 : 200 volume ppm or less, CO 2 : 0.1% by volume or less of N 2 The steel wire is annealed in atmosphere. The annealing temperature is 750-950°C. At this time, the oxygen content and K content in the steel wire are adjusted by adjusting the diameter of the steel wire, the concentration of the potassium salt solution, the annealing temperature and the annealing time.

[0107] After annealing, the steel wire is pickled, copper-plated on the surface of the steel wire, and then drawn under cold conditions to obtain a posit...

Embodiment 2

[0119] Conducted using positive polarity MAG welding wire using No. 22 and No. 30 wires shown in Table 2 Figure 2C Welding tests of lap joints with plate thickness t = 1.2 mm shown. Gap weldability was evaluated. Welding conditions are as follows: shielding gas flow rate: 20 liters / minute, welding power supply: converter power supply, polarity: positive polarity, welding current: 150A, welding voltage: 16V, welding speed 80cm / min.

[0120] The results of the evaluation are shown in Table 5.

[0121] (a) Penetration evaluation: the evaluation is as follows: Figure 2C The maximum penetration of the welded portion of the lower plate shown is 40% or more of the plate thickness: good: ○, 10% or more and less than 40%: slightly better: △, less than 10%: poor: ×.

[0122] (b) Appearance evaluation: the evaluation is as follows: there are defects caused by erosion or Figure 2C If neither of the upper and lower steel plates shown is completely penetrated, it is bad: ×, if intern...

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Abstract

The present invention is one kind of welding positive electrode MAG steel wire and its positive electrode MAG welding method. The welding positive electrode MAG steel wire is suitable for positive electrode DC welding and can avoid molten default produced in welding thin steel plate. It may be used in welding with wide gap and has excellent gap welding performance and electric arc stability andless sputtering. Specifically, the positive electrode MAG steel wire contains C 0.20 wt%, Si 0.25-2.5 wt%, Mn 0.45-3.5 wt%, RE elements 0.005-0.040 wt%, P less than 0.05 wt% and S less than 0.05 wt%except Fe and inevitable impurities.

Description

technical field [0001] The present invention relates to a positive polarity MAG (metal active gas, hereinafter referred to as MAG) welding steel wire and a welding method using it, in particular to welding a 0.2-4.5 mm thick metal wire with a weld bead as the positive pole (negative pole side). Positive polarity MAG welding steel wire used for steel plate and positive polarity MAG welding method using it. Background technique [0002] As shielding gas, Ar gas and CO are used 2 The MAG welding method of mixed gas of gas (5% by volume or more) or oxygen (1-10% by volume) is the most popular welding method, and is widely used for welding iron and steel materials because it is a highly efficient welding method. In particular, due to the rapid spread of automatic welding, it has been widely used in shipbuilding, construction, bridges, automobiles, construction machinery and other fields. In the fields of shipbuilding, construction, and bridges, it is mostly used for high-curren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/025B23K33/00B23K35/30
CPCB23K9/025B23K33/00B23K35/3053
Inventor 片冈时彦阪口修一安田功一
Owner JFE STEEL CORP
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