Efficient low heat input and double-wire surfacing method

Abstract

The invention relates to an efficient low heat input and double-wire surfacing method. The method comprises the following steps that a welding gun with two welding wires is adopted, the included angle between the two welding wires ranges from 10 degrees to 60 degrees, solid welding wires or self-protection flux-cored welding wires can be selected as the welding wires, corresponding welding flux needs to be selected when the solid welding wires are adopted, the two welding wires are connected with the positive electrode and the negative electrode of a power source respectively, the welding wires are conveyed to a position to be welded, arc striking is carried out, arc starting is carried out on the ends of the welding wires, combustion is stabilized, welding is carried out, a direct current power source is adopted as the welding power source, and the welding current ranges from 100 A to 400 A. According to the efficient low heat input and double-wire surfacing method, the fusion covering efficiency is high, and the fusion covering speed in the method is two times of the speed of welding wire fusing in traditional electric arc welding under the same welding current; the base metal is less heated, welding deformation is small, and the welding heat affected zone is small; the weld joint is fast solidified, and the fine grain tissue can be obtained.

Description

technical field [0001] The invention relates to a low-heat-input double-wire high-efficiency surfacing welding method, which belongs to the field of welding technology. Background technique [0002] With the development of welding technology, how to improve the productivity and welding quality of arc welding and expand its application field has become the focus of researchers. Under such circumstances, such as typical surfacing welding occasions, its application is limited to a certain extent, and the rational distribution of arc heat input to the base metal and welding wire has become an important direction for the development of arc welding in recent years. There are many traditional surfacing welding methods using arc heat as the heat source. Typical submerged arc welding, manual electrode welding, MAG welding, etc. can all be used for surfacing welding. These traditional welding processes are all that the workpiece is connected to one pole of the power supply during wel...

AI Technical Summary

Problems solved by technology

In all these arc welding methods, the workpiece to be welded is an electrode of the welding arc, which consumes a lot of electric energy (40-50% of the electric energy is consumed on the base metal), the heat input of the workpiece is large, and the melting amount of the base metal is large.

But in fact, in many cases, the base metal does not need such a large heat input. Excessive heat input will lead to a decrease in the performance of the welded joint, resulting in large welding deformation and residual stress and other quality problems, especially the various arc welding methods currently used. The substantial improvement of the coefficient is greatly limited, so that the traditional arc encounters great challenges in balancing welding efficiency and base metal heat input

Taking stainless steel surfacing on typical low-carbon steel as an example, in order to improve the surface corrosion resistance of the material and balance production costs, a layer of stainless steel is often surfacing on the surface of cheap carbon steel for chemical containers, etc. Traditional buried Arc surfacing often causes large deformation of the base metal, and needs to be corrected after welding, and the intergranular corrosion performance of the stainless steel layer is often reduced due to excessive heat input, and these two main problems are caused by excessive welding heat input. Large, in order to avoid these problems, many times can only rely on reducing welding heat input and sacrificing welding efficiency to ensure

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