Steel wire for carbon dioxide shielded arc welding and welding process asing the same
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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: 2004-09-29
JFE STEEL CORP
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[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
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Embodiment 1
[0065] Billets made by continuous casting were subjected to hot rolling and formed into rods with a diameter of 5.5mm-7.0mm. Then, the rod is cold-rolled (ie, wire-drawn) and formed into a steel wire with a diameter of 2.0mm-2.8mm, and then, for 1kg of 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 -2°C and the oxygen concentration is below 200 volume ppm and the CO 2 Annealing is performed in nitrogen gas with a concentration of 0.1% or less. At this time, by controlling the diameter of the steel wire, the concentration of potassium citrate solution, the annealing temperature and the annealing time, the K content and O content caused by the internal oxidation of the steel wire can be controlled.
[0067] After annealing in this way, the wire is pickled and the surface of the wire is then, if necessary, copper-plated. Next, cold wire drawing (wet wire drawing) is performed and a...
Embodiment 2
[0079] Using the steel wires shown in Tables 1, 2 and 3 and Example 1, a positive polarity carbon dioxide gas shielded arc welding test was carried out and the amount of spatter generated was measured. The results are shown in Table 4. In the Example 2 column of Table 5, common welding conditions used in the welding tests are shown.
[0080] (1) Measurement of splash volume
[0081] In the case of steel wire protruding length of 20mm, welding speed of 20cm / min, arc voltage of 30V and welding current of 300A, the steel plate SM490B (JIS G3106) with a thickness of 19mm, a width of 70mm and a length of 300mm was used to implement a carbon dioxide gas shielded plate stack Weld and measure the amount of spatter generated. The evaluation is as follows: good (○) if the spattering amount is 0.3 g / min or less, fair (△) if the spattering amount exceeds 0.3 g / min and less than or equal to 0.6 g / min, and more than 0.6 g / min min is the difference (×). The results are shown in Table 3 t...
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Abstract
In carbon dioxide arc welding by use of shielding gas comprised of carbon dioxide as main component, a welding wire that enables spray transfer of globules, and provides an excellent bead shape in addition to reduction of amount of spatters even in a high-speed welding, and a welding method using the welding wire are proposed. As the specific means, a welding steel wire for use in carbon dioxide arc welding in DC-electrode negative, comprising a bar steel having a composition that contains 0.003 to 0.20% by mass of C, 0.05 to 2.5% by mass of Si, 0.25 to 3.5% by mass of Mn, 0.015 to 0.100% by mass of REM (rare-earth elements), 0.001 to 0.05% by mass of P, and 0.001 to 0.05% by mass of S, or further contains 0.0100% by mass or less of O, or further contains one or two or more of 0.02 to 0.50% by mass of Ti, 0.02 to 0.50% by mass of Zr, and 0.02 to 3.00% by mass of Al, or further contains 0.0001 to 0.0150% by mass of K, or further contains 3.0% by mass or less of Cr, 3.0% by mass or less of Ni, 1.5% by mass or less of Mo, 3.0% by mass or less of Cu, 0.015% by mass or less of B, 0.20% by mass or less of Mg, 0.5% by mass or less of Nb, 0.5% by mass or less of V, and 0.020% by mass or less of N, and contains Fe and unavoidable impurities as residue is used.
Description
technical field [0001] The present invention relates to a welding wire for positive polarity carbon dioxide gas shielded arc welding, and more particularly to such a wire for carbon dioxide gas shielded arc welding (hereinafter referred to as welding wire) that can use the welding wire on the positive side (i.e., the positive pole) and realize the optimum Stable droplet transfer morphology, resulting in excellent weld bead shape due to low spatter. Background technique [0002] with CO 2 Gas shielded arc welding due to CO 2 Gases are cheap and efficient and are 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-intensity current multi-layer welding of thick plates, while in the fields o...
Claims
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