Which is better weld strength between submerged arc welding and high frequency welding

Straight seam submerged arc welded pipe and longitudinal seam high-frequency welded pipe are both a kind of longitudinal seam steel pipe, and their name is the first in the form of weld expression. The differences between longitudinal submerged arc welded pipes and longitudinal seam high-frequency welded pipes are: welding process, forming process, field of use, appearance and other differences.

The longitudinal submerged arc welded pipe uses the weld of the weld wire and the plate to fuse the filler, which can be understood as the weld of the longitudinal steel pipe is welded through the filler. Submerged arc welding is through the embedded welding of the weld, and the flux of the longitudinal submerged arc welded pipe is granular, which plays a cooling rate of the long longitudinal submerged arc welded pipe weld.

Straight seam submerged arc welded pipe.

The longitudinal high-frequency welded pipe is a skin effect that uses high-frequency current to make the edge of the steel plate weld melt rapidly in a very short intersection, and under the action of external force, the weld is fused together, and the weld is the base metal fusion welding.

The production of longitudinal submerged arc welded pipe adopts JCOE process forming, which is more complex than the forming process of longitudinal seam high-frequency welded pipe, and the forming efficiency is lower than that of longitudinal high-frequency welded pipe.

Longitudinal high-frequency welded pipe.

The forming process of longitudinal high-frequency welded pipe is multi-roll gradually turned into a round shape, and the strip steel is extruded by high temperature and external force to form a U-shaped round finished rolled pipe.

Straight seam submerged arc welded pipes can be used in large-diameter oil and gas long-distance pipelines, steel pipe piling, steel structures, submarine steel pipes and other fields.

Longitudinal high-frequency welded pipes can be used in grid structure pipes, small-diameter fluid steel pipes, wire pipes, foundation light structures, bottom pressure fluid steel pipes and other fields.

Straight seam submerged arc welded pipe.

The most obvious difference between the longitudinal seam high-frequency welded pipe and the finished pipe of the longitudinal seam submerged arc welded pipe is the appearance, the pipe wall of the longitudinal seam high-frequency welded pipe is smooth and smooth, there is no residual height of the weld, the pipe body is blue-gray, the pipe body of the longitudinal submerged arc welded pipe has a slight convex microscopic protrusion, and the oxide of the steel plate skin has slight traces of falling off, which can be polished according to the requirements before leaving the factory.

Personally, I think that submerged arc welding should be better, sometimes high-frequency welding is not as reliable as submerged arc welding, and the pressure of the pipe welded by submerged arc welding can reach the same level as the base metal, and the pressure of high-frequency welded pipe seems to be very low.

Submerged arc welding will be relatively better!

Advantages: 1. High weld quality.

The arc of submerged arc welding is submerged under the granular flux and its slag, and the arc and the molten pool are in the slag phase protection, and the protection effect is better than the manual arc welding of air slag protection. The dependence of the welding process on the welder's operation skills is greatly reduced, and the stability of the chemical composition and mechanical properties of the weld is better.

2. High productivity.

The current is introduced into the welding wire from the contact tip, and compared with the conductive position of the electrode of manual arc welding, the length of the conductive wire (stretching out) is short and stable, and there is no limitation of the electrode coating component by thermal decomposition, so the welding current and current density are significantly higher than that of manual arc welding during submerged arc welding, so that the arc power, penetration capacity, and welding wire melting rate are increased accordingly. Under certain conditions, the 10 20mm steel plate can be welded through and formed at one time. The maximum welding speed can reach 60 150 mh.

3. Good working conditions.

This is because submerged arc welding has no arc radiation, and the main role of the welder is only to operate the welding machine, making submerged arc automatic welding the best method of operation conditions in the arc welding method.

Disadvantages: 1. Submerged arc welding needs to rely on granular flux to cover the arc to form protective conditions, which can only be applied to horizontal plane overhead 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.

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

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.

Hope it helps!

Submerged arc welding is automatic welding, while electrode arc welding is manual welding, so long straight seam Wuxin is more suitable for automatic welding.

Burning orange Kai.

Submerged arc welding has a high welding speed.

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 the cover of a layer of granular meltable flux, and the arc is not exposed, hence the name of submerged arc welding. The metal electrodes used are optical welding wires that are fed continuously.

The welding arc burns between the wire and the workpiece, and the arc heat melts the base metal and flux at the end of the wire and near the arc.

The molten metal forms a molten pool, and the molten flux becomes the slag. The molten pool is protected by slag and flux vapors and does not come into contact with air. As the arc moves forward, the arc force pushes the liquid metal in the molten silver halt pool behind the molten pool.

In the subsequent cooling process, this part of the liquid metal solidifies into a weld.

The main disadvantages of submerged arc welding:

1) The welding current used is large, and the corresponding input power is large. Coupled with the thermal insulation effect of flux and slag, the thermal efficiency is high and the penetration depth is large. The bevel of the workpiece can be smaller, reducing the amount of filler metal. Monofilament submerged arc welding can penetrate 20mm at a time without beveling the workpiece.

2) The welding speed is high, taking the steel plate butt welding with a thickness of 8 10mm as an example, the speed of single wire submerged arc welding can reach 50 80cm min, and the speed of manual arc welding is not more than 10 13cm min.

3) The presence of flux can not only separate the contact between the molten metal and the air, but also make the molten pool metal solidify more slowly. There is more time for metallurgical reactions between the liquid metal and the molten flux, which reduces the possibility of defects such as porosity and cracks in the weld. The flux can also add some alloying elements to the weld metal to improve the mechanical properties of the weld metal.

Compare the advantages and disadvantages of electrode arc welding, CO2 welding and submerged arc welding.

Hello dear, glad to answer for you! Electrode arc welding, CO2 welding, and submerged arc welding are common metal welding methods, and they have their own advantages and disadvantages, and here is a comparison of them:1

Advantages of electrode arc welding:- The welding equipment is simple and easy to operate; - Suitable for welding in various positions, including up, down, vertical, horizontal, etc.; - Suitable for different kinds of metal materials, such as carbon steel, alloy steel, stainless steel, etc. Cons:

The welding efficiency is low, and the welding speed and weld quality need to be manually controlled; - The atmosphere has an impact on the quality of the weld, and it is easy to be affected by external factors such as wind and rain and cause quality problems. Welding advantages: Yukong - fast welding speed and high efficiency; - Stable welding quality and high weld quality; - It can be applied to different kinds of metal materials, such as carbon steel, aluminum alloy, etc.

Disadvantages:- The welding equipment is more complex and requires the use of equipment such as high-pressure gas cylinders and regulators; - It is greatly affected by the external environment, such as wind, rain, humidity and other environmental factors will affect the quality of the weld. 3.

Advantages of submerged arc welding:- Fast welding speed and high efficiency; - Stable welding quality and high weld quality; - Can be applied to welding in a variety of positions. Cons:

Welding equipment is more complex and requires the use of equipment such as high-pressure gas cylinders and regulators; - Submerged arc welding requires a large current and has high requirements for electricity**; - The applicable chain dismantling and modification circumference is relatively narrow, and it is generally used for thick plate welding. I hope mine is helpful to you and I wish you a happy life

Compare the advantages and disadvantages of electrode arc welding, CO2 welding and submerged arc welding.

Electrode arc welding, oak CO2 welding, and submerged arc welding are common metal welding methods, and they each have some advantages and disadvantages. The advantages of electrode arc welding are that the process is simple, the equipment investment cost is low, and it is suitable for smaller welding operations. In addition, electrode arc welding can be used to weld different kinds of metal materials, such as carbon steel, alloy steel, etc., with good versatility.

The disadvantage is that it produces more smoke and gases, so a good ventilation system is required. At the same time, the welding quality is greatly affected by the skill level of the welder, the welding speed is slower, and the production efficiency is low. The advantages of CO2 welding are high production efficiency, weld seams, and can be used to weld thick metal sheets and workpieces with complex shapes.

At the same time, the gas produced during CO2 welding is relatively stable and does not have much impact on the environment. The disadvantage is that the cost of equipment and gas is high, which requires a large initial investment, and at the same time, a certain gas flow rate and protection need to be ensured during the welding process, otherwise defects such as porosity and cracks will occur. The advantage of submerged arc welding is that it can achieve high welding speed and high production efficiency, and it is suitable for the production of bulk hand spring metal products.

In addition, since the seam shielding gas is placed under the workpiece during the welding process, there are some welding positions that do not need to be protected from the place, reducing the workload. The disadvantage is that the equipment investment cost is high, it is difficult to weld thinner metal sheets, high longitudinal space is required, and in addition, the welding quality is more susceptible to metal surface contamination.

Because the characteristics of submerged arc welding and manual welding are different, because the submerged fox welding has strong penetration and high current, it is the first choice for thicker materials. . . There is also the problem of chemicals and ordinary electrodes, which make the difference between the current...

Because submerged arc welding is continuous wire feeding and the welding wire is thicker, if the welding current is not large enough, the welding wire cannot be continuously melted, and it cannot be welded normally.

During electrode arc welding, if the welding current is too large, the resistance heat will make the welding core red and the temperature too high, which will cause the coating to fall off and affect the slag protection effect.

Submerged arc welding is automatic welding, the welding current is sent to the wire through the contact tip when it is about to enter the arc space, the length of the wire extension is small, and the resistance heat generated is small, so it is allowed to use a much larger welding current than the electrode arc welding, and the welding wire will not produce the problem of redness due to resistance heat.

Therefore, thicker welding wire and welding current can be used in submerged arc welding, which increases the melting speed and welding depth of the welding wire, which will greatly improve the welding productivity.