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Steel wire for carbon dioxide shielded arc welding and welding process asing the same

A technology of gas shielding and carbon dioxide, applied in the direction of arc welding equipment, welding medium, welding equipment, etc., can solve problems such as difficult spray transition

Inactive Publication Date: 2006-05-03
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, when the spray transfer of droplets can be used in typical mixed gas shielded arc welding (CO 2 The mixing ratio of gas and Ar gas is 2-40% by volume), when using CO 2 In the welding of shielding gas whose gas mixing ratio exceeds 40% by volume, it is difficult to achieve spray transfer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The billet produced by continuous casting is hot rolled and formed into a bar with a diameter of 5.5mm-7.0mm. Then, the bar is cold-rolled (that is, wire-drawn) to form a steel wire with a diameter of 2.0mm-2.8mm, and then, for a 1kg steel wire, 30-50g of a 2-30% by volume aqueous solution of tripotassium citrate is coated.

[0066] Then, the steel wire is below the dew point of -2℃ and the oxygen concentration is below 200 volume ppm and the CO 2 Annealing is performed in nitrogen with a concentration of 0.1% or less. At this time, by controlling the diameter of the steel wire, the concentration of the potassium citrate solution, the annealing temperature and the annealing time, the K content and the O content caused by the internal oxidation of the steel wire can be controlled.

[0067] After annealing in this way, the steel wire is pickled, and then the surface of the steel wire is subjected to copper plating if necessary. Then cold wire drawing (wet wire drawing) is per...

Embodiment 2

[0079] The steel wires shown in Tables 1, 2 and 3 and Example 1 were used to perform a positive carbon dioxide gas shielded arc welding test and the amount of spatter generated was measured. The results are shown in Table 4. In the Example 2 column of Table 5, the common welding conditions used in the welding test are shown.

[0080] (1) Measurement of splash amount

[0081] When the steel wire extension length is 20mm, the welding speed is 20cm / min, the arc voltage is 30V and the welding current is 300A, a steel plate SM490B (JIS G3106) with a thickness of 19mm, a width of 70mm and a length of 300mm is used to implement a carbon dioxide gas protection flat stack Weld and measure the amount of spatter. The evaluation is as follows: the amount of splashing is 0.3g / min or less as good (○), the amount of splashing is more than 0.3g / min and less than or equal to 0.6g / min as normal (△), and the amount of splashing is greater than 0.6g / Min is the difference (X). The results are shown i...

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Abstract

In carbon dioxide gas-shielded arc welding using a shielding gas composed of carbon dioxide as a main component, a welding wire is proposed which makes jet transfer of molten droplets possible and provides excellent bead shape, and a welding method using this wire is proposed. As a specific method, a welding wire according to the present invention is used, which comprises a steel rod containing 0.003-0.20% by mass of C, 0.05-2.5% by mass of Si, 0.25-3.5% by mass of Mn, 0.015-0.100% by mass of rare earth elements , 0.001-0.05% by mass of P, 0.001-0.05% by mass of S, Fe and unavoidable impurities, and may also contain 0.0100% by mass or less of O, or 0.02-0.50% by mass of Ti, 0.02-0.50% by mass of One or more elements in Zr and 0.02-3.00% by mass of Al.

Description

Technical field [0001] The present invention relates to a welding wire for positive polarity carbon dioxide gas shielded arc welding, and in particular to such a wire for carbon dioxide gas shielded arc welding (hereinafter referred to as welding wire), that is, it can use the welding wire on the positive side (that is, the positive electrode) and achieve the best Stable droplet transfer morphology and excellent weld shape due to less spatter. Background technique [0002] Take CO 2 Gas-shielded arc welding with shielding gas due to CO 2 Gas is cheap and efficient, and is widely used for welding steel materials. In particular, with the rapid spread of automatic welding, the welding method has been used in various fields such as shipbuilding, construction, bridges, automobiles, and civil engineering machinery. In the fields of shipbuilding, construction and bridges, this welding method is mostly used for high-strength current multilayer welding of thick plates, while in the fields...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K9/16
CPCB23K9/16B23K35/3053B23K35/30B23K35/3073B23K35/0255B23K35/0261
Inventor 片冈时彦池田伦正安田功一坂下干雄时乘健次
Owner JFE STEEL CORP
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