What is the welding method of submerged arc welding? What is submerged arc welding

Hello 1. Generally, the welding angle height is determined according to the thickness of the plate and the welding method.

2. Submerged arc welding (including submerged arc surfacing and electroslag surfacing welding, etc.) is a method of arc burning under the flux layer for welding, and its inherent welding quality is stable, welding productivity is high, no arc light and smoke and dust are very little, 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.

Submerged arc welding welding process and operation method: Preparation before welding 1. Prepare the welding wire flux, the welding wire needs to remove dirt, oil, rust and other substances, and coil it regularly in the wire reel, the flux should be dried in advance (bake at 250 °C for 1-2 hours), and do not let other impurities mix. The weld of the workpiece should remove oil and dirt Welding work 1, press the start button, at this time the welding wire is pumped up, and then the welding wire automatically becomes sent down to the workpiece contact friction and cause arc, so as to ensure that the arc burns normally and the welding work is carried out normally.

End of Soldering Close the gate of the flux funnel and stop the flux feed. Tap (i.e. press half deep, don't press to the bottom)...

Submerged arc welding is also known as arc welding under the flux layer, its welding walking, wire feeding are automatic, that is to say: it is a method of arc burning and welding under the flux layer, its advantages are high degree of automation, stable quality, high welding speed, the disadvantage is that it is only suitable for horizontal welding on a fixed platform. The welding schematic diagram is shown in the figure below

1. Brazing. Brazing refers to the welding method in which the brazing metal below the melting point of the weldment and the weldment are heated to the melting temperature of the brazing material at the same time, and the liquid brazing material is used to fill the gap of the solid workpiece to make the metal connection. According to different temperatures, it can be divided into hard brazing and soldering.

During brazing, the first thing to do is to remove the oxide film and oil stain on the contact surface of the base metal, so as to facilitate the capillary to play a role after the brazing metal is melted, and increase the wettability and capillary fluidity of the brazing metal. According to the different melting points of the brazing precursor, brazing is divided into hard brazing and soft brazing.

2. Fusion welding. Fusion welding refers to the process of welding the welded joint to a molten state under the action of high temperatures. Since the welded workpieces are tightly adhered to each other, under the action of temperature field, gravity, etc., without pressure, the molten liquid of the two workpieces will be mixed.

After the temperature is lowered, the molten part is condensed, and the two workpieces are firmly welded together to complete the welding method.

3. Pressure welding. Pressure welding is to make two workpieces under pressure to achieve atomic bonding in a solid state, also known as solid welding. The commonly used pressure welding process is resistance butt welding, when the current passes through the connection end of the two workpieces, the temperature rises due to the large resistance, and when heated to the plastic Wu Hu san state, it is connected under the action of axial pressure to become a whole.

4. Gas welding. Gas welding, English: oxygen fuel gas welding (abbreviated as OFW).

It is a welding method that uses the flame generated by the mixed combustion of combustible gas and combustible gas as the heat source to melt the weldment and welding material to achieve interatomic bonding.

5. Electroslag welding.

Electroslag welding uses the resistive heat generated by the electric current through the slag as a heat source to melt the filler metal and the base metal, and solidify to form a firm connection between metal atoms.

At the beginning of welding, the welding wire and the welding groove are short-circuited and the arc starts, a small amount of solid flux is continuously added, and the heat of the arc is used to melt it to form liquid slag, and when the slag reaches a certain depth, the feeding speed of the welding wire is increased, and the voltage is reduced, so that the welding wire is inserted into the slag pool, and the arc is extinguished, so as to transfer to the electroslag welding process.

There are two types of single-sided welding and double-sided welding.

There are basically two types of welding methods.

Hello, the difference between submerged arc welding and argon arc welding: submerged arc welding: the method in which an electric arc burns under the flux layer for welding.

Features: 1) Submerged arc welding can use a larger welding current than the number of letters, and the production efficiency is high. 2) The protection effect is good and the weld quality is high.

3) The working conditions are good. 4) Submerged arc welding relies on the accumulation of granular flux to form protective conditions, so it is mainly suitable for horizontal position tan wheel weld welding. However, a special mechanical device can be used to ensure that the flux is stacked in the welding area and does not fall, so as to realize submerged arc horizontal welding, vertical welding and vertical welding, as well as submerged arc horizontal welding and vertical welding with magnetic flux.

5) The composition of submerged arc welding flux is mainly metal and non-metal oxides such as MNO, SIo2, etc., which is difficult to weld aluminum, titanium and other metals and their alloys with strong oxidation like arc welding. 6) It is only suitable for the welding of long welds. Due to the poor flexibility of maneuverability, the welding equipment is also more complex than hand arc welding, and the short weld does not show the characteristics of high production efficiency.

7) The electric field strength of the submerged arc welding arc is large, and when the current is less than 100A, the stability of the arc is not good, so it is not suitable for welding thin plates with a thickness of less than 1mm. TIG welding: arc welding is carried out under the protection of argon gas by using welding wire as electrode and filler metal.

Features: 1) It has a wide range of current regulation. (2) It is conducive to the realization of full-position welding.

3) It is conducive to controlling the quality of welding.

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.

The essence of submerged arc welding is that under the flux layer of a certain size particle, the arc heat generated by the discharge between the wire and the weldment causes the end of the welding wire and the weldment to melt locally to form a molten pool, and the weld is formed after the molten pool metal solidifies. This process is carried out under the flux layer, so it is called submerged arc welding.

After an electric arc is generated between the end of the wire and the weldment, the radiant heat of the arc melts the surrounding flux, a portion of which reaches the boiling point, and evaporates to form a high-temperature gas that discharges the molten flux (slag) around the arc.

An air bubble is formed, in which an electric arc burns, and the upper part of the bubble is surrounded by an outer film consisting of partially melted flux and slag shell. Not only does it do a good job of separating the molten pool from the air, but it also blocks the radiation of the arc light.

As the arc burns continuously inside the bubble, the wire melts continuously to form molten droplets that fall into the molten pool. When the arc moves forward along the direction of the weld, the molten pool also cools and solidifies to form a weld, and the slag with less density floats on the surface of the molten pool and becomes a slag shell after cooling.

The welding process of submerged arc welding can be described as follows: after the flux flows out of the funnel, it is evenly sprinkled on the assembled weldment, and the stacking height is 30 50mm. The welding wire is controlled by the wire feed wheel and fed into the welding arc area through the contact tip. The output of the welding power supply is connected to the contact tip and the weldment respectively.

The wire feeding mechanism, flux funnel and control panel shield are usually mounted on a trolley. When welding, the welding process can be carried out automatically by pressing the start button.

1. Buried solitary welding has certain advantages, such as high weld quality, high productivity, good working conditions, etc., but there are also many disadvantages

1. Submerged arc welding needs to rely on granular flux to cover the arc to form protective conditions, and can only be applied to horizontal plane subposition welding. Although vertical welding and horizontal welding have been studied, they have not been widely used because they have no significant effect.

2. The main components of flux are metal and non-metal oxides such as MNO and SIO2, which is difficult to weld aluminum, magnesium and other metals with strong oxidation and their alloys.

3. It is only suitable for long weld welding, and the productivity of short weld welding is not as good as manual arc welding.

4. The chemical composition of the flux determines that the potential gradient of the arc column of submerged arc welding is large, and the arc stability is poor when the current is less than 100A, so it is not suitable for welding thin plates with a thickness of less than 1mm.

Second, the electrode arc welding has the following characteristics compared with submerged arc automatic welding:

1) The energy of the welding line is small, the metal grains of the weld are fine, and the mechanical properties of the welded joint are good.

2) Easy to operate, strong adaptability, suitable for welding of different steel grades, various positions and various structures.

3) The equipment is simple and the investment is small.

4) Low production efficiency.

5) The labor intensity of welders is high.

6) Welder skills determine welding quality.

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.

It depends on whether you are speaking from a physical point of view or a chemical point of view.