Arc welding wire

Abstract

A wire for arc welding is provided with hardness deviation on the surface layer in the circumferential direction is within 45, and has a surface condition where the values of the critical measurement distance R, at the point where the gradient of a graph converges to a certain value, and the value of correlation function G(R)(A 2) of critical roughness satisfy 1.0* 104 to 2.0* 105 and 5.0* 104 to 1.0* 108, respectively, when the distance R and the value of correlation function G(R) of roughness are plotted in the graph after measuring each coordinates and height in the area to be measured on the surface of the wire by using an interatomic force microscope or a similar scanning atomic microscope and calculating the value of the roughness correlation function G(R) as a function of the measurement distance (R) with the equation of G(R)=<[z(x, y)-Z(x, y)]2>.

Description

technical field [0001] The present invention relates to arc welding wires including solid wires, fluxed wires, etc., and in particular, to arc welding wires suitable for welding mild steel, high tensile steel, stainless steel, etc., with good arc stability and deliverability. Background technique [0002] In the manufacture of solid welding wire, a wire rod (welding wire) with a diameter of 5.5 to 8.0 mm is formed by hot rolling or drawing, and high-temperature rust usually remains on the surface of the wire rod, and as time passes, it reacts with moisture in the air to form Low temperature rust. Therefore, in order to remove the scale, bending processing, wire brushing, etc., or physical methods such as shot blasting and sandblasting are used. In addition, the welding wire with the above-mentioned scale attached can also be dipped in hydrochloric acid or sulfuric acid to remove the rust by chemical methods. It is also possible to use physical and chemical methods such as ...

AI Technical Summary

Problems solved by technology

However, this method, like the general surface roughness measurement method, estimates the roughness of the surface state from a macroscopic dimension, so it is also difficult to obtain accurate surface information.

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