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
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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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