Welding electrode and coating for welding under wading environment, and preparation methods of welding electrode and coating

Abstract

The invention discloses a welding electrode and a coating for welding under a wading environment, and preparation methods of the welding electrode and the coating. The coating comprises the followingcomponent raw materials of, by weight, 35-50% of rutile, 10-20% of calcium carbonate, 5-15% of fluorite, 7-18% of mica, 2-9% of ferrosilicon, 3-9% of ferromanganese, 4-10% of titanium and 1.5-5% of yttrium. Potassium sodium water glass with the weight being 18-30% of the total weight of the coating is further added into the coating, and the mass ratio of potassium oxide to sodium oxide in the potassium sodium water glass is 2:1. Meanwhile, the invention further discloses the preparation methods of the welding electrode and the coating. The preparation process is simple, arcing is easy during welding, electric arc combustion is stable, the phenomena of arc quenching and breaking are avoided, an obtained welded seam is attractive in forming, the tensile strength of a butt-joint connector canreach 550 MPa, the thickness of the butt-joint connector is four times that of a plate, cracks are avoided when the cold bending angle is 180 degrees, the advantages of good welding manufacturability, convenient test operation, high welding efficiency and the like are achieved, and welding of workpieces under the wading environment can be met.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to an electrode used for welding in a wading environment. Background technique [0002] With the rapid development of high-tech, automobiles, ships, railways, construction and marine engineering construction in recent years, the application prospects of welding technology are becoming more and more extensive, and the requirements for welding in some special environments are also increasing. Many, for example, the surface of the weldment is wet, with water, or welding in a rainy environment, which is collectively referred to as welding in a wading environment. When welding in this environment, the workpiece is usually dried, and then welded when there is no moisture on the surface of the workpiece. A lot of inconvenience, welding efficiency is greatly reduced. In addition, there are many special environments where the workpiece cannot be dried before welding, ...

AI Technical Summary

Problems solved by technology

When welding in this environment, the workpiece is usually dried, and then welded when there is no moisture on the surface of the workpiece. A lot of inconvenience, welding efficiency is greatly reduced

In addition, there are many special environments where the workpiece cannot be dried before welding, such as emergency maintenance welding near the waterline of the hull and ship lock, welding of steel structures near the water level of the offshore platform, and welding in some emergency situations before welding. handling of the situation, etc.

In these cases, it is very difficult to weld, and the welding quality is difficult to guarantee, and there are potential safety hazards in service

[0003] At present, the commercially available electrodes are mainly land electrodes and underwater electrodes. When land electrodes are used for welding in a wading environment, the water on the surface of the workpiece will be decomposed by heat, resulting in a high concentration of hydrogen dissolved in the weld pool. It is very easy to generate hydrogen pores and hydrogen cooling cracks in the welding rod, which will affect the performance of the joint; in order to protect the arc in the welding area during underwater welding, and at the same time under the action of water pressure, in order to ensure the stability of the arc, more welding rods are added to the underwater electrode. Air Elements and Steady Arc Elements

Therefore, when underwater electrodes are used for welding in a wading environment, too many gas-generating elements will lead to more smoke and gas during welding, and a large number of pores are likely to be generated in the weld, which will affect the quality of the joint

It can be seen that welding in a wading environment is neither suitable for land electrodes nor underwater electrodes.

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