What is buried solitary welding?

Features: 1. High welding productivity.

The welding current used in submerged arc automatic welding is large, coupled with the thermal insulation effect of flux and slag, the thermal efficiency is high, the penetration depth is large, and the monofilament submerged arc welding can penetrate 20mm at a time without beveling the weldment. The welding speed is high, taking the butt welding of steel plate with a thickness of 8-10mm as an example, the speed of single-filament submerged arc welding can reach 50-80cmmin, and the speed of hand-arc welding is not more than 10-13cmmin.

2. Welding***.

The presence of flux and slag not only prevents nitrogen and oxygen in the air from invading the molten pool, but also solidifies slowly, so that the metallurgical reaction between the liquid metal and the melted flux has more time, and reduces the possibility of porosity, cracks and other defects in the weld. The flux can also bleed alloy into the weld, improving the mechanical properties of the weld metal. In addition, the weld is beautifully formed.

3. Good working conditions.

The mechanized operation of the welding process is more convenient, and the smoke and dust are less, and there is no arc radiation, the working conditions are improved because the submerged arc welding adopts granular flux, which is generally only suitable for the flat welding position, and the welding of other positions needs to adopt special measures to ensure that the flux can cover the welding area, and the submerged arc automatic welding is mainly suitable for the welding of low carbon steel and alloy steel medium and heavy plates, and is a welding technology commonly used in the production of large-scale welded structures.

High production efficiency, welding, good working conditions, no arc radiation in mechanized operation, but the relative position of the weld pool and the weld and the groove cannot be directly observed during welding, and it is generally only suitable for flat welding and fillet welding positions.

Submerged arc welding.

1. The principle and characteristics of submerged arc welding.

Submerged arc welding is also a welding method that uses an electric arc as a heat source. In submerged arc welding, the arc is burned under a layer of granular meltable flux, and the arc light is not exposed. This is where submerged arc welding gets its name. The metal electrodes used are bare wires that are fed continuously.

Second, the scope of application of submerged arc welding.

Due to the large penetration depth, high productivity and high degree of mechanical operation, submerged arc welding is suitable for welding long welds of medium and heavy plate structures. It has a wide range of applications in shipbuilding, boilers and pressure vessels, bridges, overweight machinery, nuclear power plant structures, marine structures, ** and other manufacturing sectors, and is one of the most commonly used welding methods in today's welding production.

In addition to being used for the connection of components in metal structures, submerged arc welding can also be used to weld wear-resistant or corrosion-resistant alloy layers on the surface of the base metal.

With the development of welding metallurgy technology and welding material production technology, the materials for submerged arc welding have developed from carbon structural steel to low-alloy structural steel, stainless steel, heat-resistant steel, etc., as well as some non-ferrous metals, such as nickel-based alloys, titanium alloys, copper alloys, etc.

Submerged arc welding (including submerged arc surfacing and electroslag surfacing welding, etc.) is a method in which the arc is burned under the flux layer for welding. Its inherent welding quality is stable, welding productivity is high, no arc light and little smoke and dust, etc., making it the main welding method in the production of important steel structures such as pressure vessels, pipe sections, and box-shaped beams and columns. In recent years, although many new welding methods with high efficiency and high quality have emerged, the application field of submerged arc welding has not been affected in any way.

Submerged arc welding accounts for about 10% of the total amount of deposited metal by various fusion welding methods, and it has not changed much over the years.