Copper-free wires for gas-shielded arc welding

Abstract

A copper-free welding wire for gas shielded arc welding, which has excellent arc stability during semi-automatic welding or automatic welding, thereby ensuring better wire feedability and reducing the amount of welding slag. The wire has a smooth machined surface, and depressions formed in the surface (toward the center of the wire) relative to the machined surface reference, the depressions being distributed on the surface of the wire in a circumferential direction. The ratio of the total length of the processed surface to the reference arc length of the welding wire is in the range of 50-95%. 0.03-0.70 g of surface treatment agent is coated per 1 kg of the welding wire. The surface treatment agent includes at least one of animal oil, vegetable oil, mineral oil, mixed oil and synthetic oil. The wire makes stable contact of the wire with the contact tip so that copper flakes do not accumulate in the wire guide and contact tip during prolonged welding, thus providing good arc stability and enabling stable and Reduce splash.

Description

technical field [0001] The present invention relates to copper-free welding wire for gas-shielded arc welding, and more particularly to such a copper-free welding wire for gas-shielded arc welding, which has good arc stability during semi-automatic welding or automatic welding, thereby ensuring better feeding Silkiness and reduce the amount of welding spatter. Background technique [0002] Recently, with the development of automatic welding, the application of gas-shielded arc welding wires has rapidly increased, and as a result, gas-shielded arc welding wires are widely used especially in the fields of automobile industry, shipbuilding industry, construction industry and the like. In this way, welding wires are widely used in the above-mentioned various fields, and in order to ensure the properties of the welding wires, such as electrical conductivity, wire feedability, rust resistance, etc., the welding wires are generally copper-plated on their surfaces. In the case of c...

AI Technical Summary

Problems solved by technology

[0006] The inventors of the present invention studied the conventional technology as described above, and found that since it is essentially impossible to uniformly control the size (volume) of the bottleneck-like or cave-like pit, that is, the inner volume of the depression, as disclosed in the conventional technology It is impossible to uniformly coat the surface of the welding wire with a functional coating agent in the circumferential direction only by using the ratio of the length of the bottle-neck or cave-like pit and the length of the part that the vertically incident light cannot reach from the outside to the reference arc length of the welding wire

Therefore, in the conventional technology, when welding for a long time, the powdery functional coating agent accumulates in the wire feeding guide and the contact tip, causing unstable wire feeding, and the powdery functional coating agent hinders the contact between the contact tip and the welding wire. The stable contact between them will cause the arc to be unstable, resulting in an increase in the generation of welding slag

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