What are the advantages and disadvantages of oxygen welding and electric welding

Advantages of oxygen welding:

1. Gas shielded welding has strong penetration ability, high welding current density (100-300A m2), small deformation and high production efficiency.

2. Carbon dioxide gas is cheap, and the cleaning of the workpiece before welding can be simplified, and the welding cost is only 40%-50% of the electrode arc welding.

3. The weld has strong rust resistance, low hydrogen content, and low tendency to cold cracks.

Disadvantages of oxygen soldering:

1. There is a lot of metal spatter in the welding process, especially when the process parameters are mismatched, which is especially serious.

2. Metal materials that are easy to oxidize can not be welded, and the wind resistance is poor, and windproof measures are required during field operations or leakage operations.

3. Welding arc intensity, pay attention to arc radiation.

Advantages of electric welding: 1. It is an economical, applicable and technologically advanced method in material connection processing.

2. Welding with electricity can realize almost any two metal materials, as well as welding between some metal materials and non-metal materials.

3. It can be realized to make a large-scale, economical and reasonable structure from small to large.

4. Materials with different properties can be used in different parts of the structure to give full play to the characteristics of various materials.

5. The welding parts have the characteristics of good air tightness and light weight.

5. Electric welding can also realize the welding between ultra-thin and ultra-fine materials.

Disadvantages of electric welding: 1. Arc welding uses power supply, and the high-temperature arc generated by it is easy to cause fire, which is more dangerous.

2. Unclear vision and poor working conditions.

In our country, welding operations need to be licensed, welders are the type of work that belongs to the access category, in the professional qualifications of skilled personnel, only five of the 81 types of work in the access category, welders are one of them, and the actual situation is that most of the industry practitioners are unlicensed operations. With the continuous standardization of technology and the relevant requirements of the industry, more and more people want to take a welding certificate, the advantage of the certificate is still very large, first of all, the salary of the certificate and the non-certificate are very different, often able to reach more than double or higher level. Therefore, the issue of short-term welder training has naturally become a concern for practitioners.

Welding as an industrial "tailor" is a very important means of processing in industrial production, the quality of welding plays a decisive role in the quality of the product, so, what is the future development of welding technology?

Industry outlook. With the development of production, welding is widely used in aerospace, aviation, nuclear industry, shipbuilding, construction and machinery manufacturing and other industrial sectors, in China's economic development, welding technology is an indispensable means of processing. After entering the 21st century, welding is an important part of the manufacturing industry, and the rapid development, so it has brought unprecedented development opportunities to the welding industry.

At present, China consumes 300 million tons of steel every year (about tons of welded structure), and needs about 750,000 welding machines, and the welding industry will continue to grow in the next 8 10 years.

You have to see what you are welding, a thinner iron sheet can be used for oxygen welding, and three thick or more electric welding is stronger! Oxygen welding, the welded products are beautiful and easy to operate! Electric welding requires skill and is strong.

I do electric welding, I have done all kinds of welding, and now I do oxygen welding! It's okay to talk about it.

Electric welding is welded at the temperature generated by the arc, while oxygen welding is welded at the temperature generated by the combustion of acetylene gas and oxygen.

Electric welding is arc welding, which uses the contact surface of the positive and negative electrodes to be very small, and produces high-temperature molten metal to weld two objects; Dioxygen is oxygen and acetylene, which melt metals at high temperatures obtained by their combustion.

Electric welding is arc welding, and dioxygen is oxygen and acetylene.

Electric welding is commonly referred to as manual arc welding, in which the electrode and the welded part are fused with each other through the arc.

Carbon dioxide shielded welding is the welding of steel components through carbon dioxide protection, and oxygen cutting refers to the formation of high temperature between oxygen and acetylene at the cutting nozzle to cut the steel plate into the shape you need.

Hand arc welding is a manual arc welding method that uses the arc generated between the electrode and the weldment to heat the electrode and the weldment to a molten state for welding. Carbon dioxide is a kind of MIG/MAG arc welding, which uses the filler wire as the electrode, and the shielding gas flows out of the nozzle at a certain speed, separating the arc melting wire, the molten pool and the nearby weldment metal from the air, eliminating its harmful effects, so as to obtain a weld with good performance. Ordinary arc welding machines cannot be modified.

The internal structure varies greatly. How it works. Control.

Cladding metal. None of the methods of operation can be compared. CO2 and arc welding are faster as compared to the speed.

Now there are still people who doubt the cost of second welding?

Don't you know that science and technology are the primary productive forces?!

Let's talk about welding consumables first, the second guarantee welding wire is 8 yuan a kilogram, and the welding rod is 6 yuan a kilogram, which seems to be cheap.

You have to see how much filler metal is left in the weld after welding, and the same amount of filler can be compared.

1. The coating on the outside of the welding rod, and finally the welding slag and shielding gas, do not belong to the filler metal.

2. Each electrode has a welding rod head, at least 5 cm, which has to be thrown away, and does not belong to the filler metal.

3. The welding rod has a large spatter and the metal that splashes out does not belong to the filler metal.

In addition, the welding rod needs to be dried, the oven, the insulation barrel, the electricity for heating, and the discarded electrode head.

It also has to talk about the power consumption of welding, the same welding effect, the heat input of the second guarantee welding is small, that is, the cost of electricity is less, and the inverter welding machine is more energy-saving.

Let's talk about efficiency and speed.

1. No need to bake welding rods, save time and reduce one labor.

2. There is no need to change the welding rod, and there is no need to start the arc from the new, saving time 3. There is no need to knock on the welding slag, at least reduce a small worker.

4. In terms of welding speed, the second protection welding is three times that of the welding rod. (Just this one, a welder can top three, you calculate, how much labor savings!) ）

The automatic welding of long-distance pipelines mostly adopts carbon dioxide gas shielded welding and oxidizing mixed gas shielded welding, that is, the gas used is CO2, CO2+AR or CO2+AR+O2. The role of inert gas (such as AR) in MIG/MAG welding is to discharge the air around the arc and the molten metal, so as to avoid harmful components in the air affecting the stability of the arc and the liquid metal being contaminated. Other non-inert gases (e.g. CO2, O2) can also be used as shielding gases for MIG/MAG welding.

The premise is that although these gases can have some metallurgical reactions with the protected liquid metal, conditions can be created during the welding process so that the consequences of these reactions will not cause harm to the welded joint. If CO2 is used as the shielding gas, although CO2 decomposes O2 and CO2 at the high temperature of the arc during the welding process, which then oxidizes FE to form FEO and may cause porosity, this adverse effect can be solved by adding an appropriate amount of deoxidizing elements such as Si and MN to the welding wire. It is found that the composition and flow rate of shielding gas have a certain influence on weld molding, and the probability of defects is also different due to different composition and flow rate, different oxygen content in the weld, different weld molding, and different defect probabilities.

For example, when pure CO2 is used as the shielding gas and the flow rate is large, the condensation of the weld is accelerated due to the decomposition and endothermy of CO2, and the fluidity of the molten iron becomes poor, resulting in the front weld is easy to form a ridge shape, and the depression is easy to lead to defects such as non-fusion and slag inclusion in the subsequent welding process, and the back weld is easy to lead to false melting, which is particularly prominent when the welding environment temperature is low and the line energy is low. In addition, the rapid condensation of the weld is prone to porosity in the weld. If CO2+AR mixed gas is used, such as CO2 (15% 20%) AR (85% 80%), the fluidity of molten iron can be improved, and good weld forming can be obtained, with good transition between the base metal and the weld, low oxygen content in the weld, and good weld impact toughness.

This should be taken into account when selecting the composition and flow rate of the shielding gas.

The protective medium of CO2 protective welding is CO2, and the protective effect is better than that of electrode arc welding, and the protective medium of electrode arc welding is the protection generated by the gas-making and slag-forming substances in the coating, and the effect is not as good as CO2.

Summary. Dear dear, it's a pleasure to answer your <>

Oxygen welding is not oxygen welding; Oxygen welding and oxygen welding are different welding methods. Oxygen welding is a welding method that uses oxygen with a burning fuel, such as acetylene, to create a high-temperature flame to heat and melt metal. In oxygen welding, oxygen is used to support combustion and provide a heat source for high temperatures.

Whereas, oxygen welding is a welding method that uses a mixture of oxygen and acetylene to create a red-hot flame to heat and melt the metal. In oxygen welding, oxygen and acetylene are mixed in proportion to obtain a high temperature and high speed of flame, making it more suitable for some welding needs that require high efficiency and high quality. Therefore, oxygen welding and oxygen welding are two different welding methods.

Oxygen welding is not oxygen welding;

Dear dear, it's a pleasure to answer your <>

Oxygen welding is not oxygen welding; Oxygen welding and oxygen welding are different welding methods. Oxy-Oxygen welding is a welding method that uses oxygen and combustion fuels (e.g., acetylene) to create a high-temperature flame to heat and melt metal. In oxygen welding, oxygen is used to support combustion and provide a heat source for high temperatures.

Oxygen welding, on the other hand, is a welding method that uses a mixture of oxygen and acetylene to create a red-hot flame to heat and melt metal. In oxygen welding, oxygen and acetylene are mixed in proportion to obtain a high temperature and high speed of flame, making it more suitable for some welding needs that require high efficiency and high quality. Because of this, oxygen welding and oxygen welding are two different welding methods.

<> related extensions: In addition to oxygen welding and oxygen welding, there are many other welding methods. Common welding methods include electric contact differential arc welding, argon arc welding, laser welding, resistance welding, plasma welding, etc.

These welding methods have different principles and application ranges, and the suitable welding method can be selected according to the specific needs. Arc welding is a welding method in which two or more metals are heated by an electric arc to melt them and the gaps are filled with metal materials. TIG welding is a method that uses argon to protect the arc and molten metal, and is suitable for welding stainless steel, aluminum and other materials.

Laser welding is a welding method that uses a laser beam to heat and melt metal, and has the advantages of high accuracy, high speed, and high quality. Resistance welding is a method of soldering a metal spine by heating a metal material to its melting point and connecting two metals with a metal filler material. Plasma welding is a method that uses plasma to heat and melt metal, using gases such as nitrogen and hydrogen to protect the arc and molten metal.

It has the following advantages:

1) High production efficiency, saving slag removal time.

2) Weld seam, good crack resistance.

3) The weld heat-affected zone and weldment deformation are small, which is suitable for welding thin plates.

4) The operation is simple, easy to master, and easy to achieve automation.

5) Low cost and low energy consumption.

The main disadvantages of CO2 gas shielded welding are:

1) The splash is large.

2) The arc light is stronger.

3) The welding equipment is more complex and the maintenance technology requirements are high.

4) Welding cannot be carried out in windy places.

1.Manual arc welding (referred to as manual arc welding) is a method of using the arc heat between the electrode and the weldment to melt the metal by using the electrode and the weldment as two electrodes.

Advantages and disadvantages. The equipment is simple, the method is simple and flexible, the adaptability is strong, and the manual operation technology requirements are high.

Adaptation: field assembly operations, underwater welding, high-strength welding, and ordinary structural parts welding.

2.Carbon dioxide gas shielded welding is a gas shielded welding method that uses carbon dioxide as the shielding gas and relies on the arc generated between the welding wire and the weldment to melt the metal, referred to as CO2 welding.

CO2 gas shielded welding features:

Small welding stress and deformation, suitable for all-position welding, high CO2 gas, low welding power consumption, low sensitivity to rust, not easy to produce porosity, low hydrogen content of weld, good crack resistance, high productivity; Auxiliary machines can be used to automate production.

3.Tungsten argon arc welding is the welding of argon as a shielding gas. With the help of an electric arc created between the tungsten electrode and the weld body, the welding material itself (which is also melted when filler metal is added) is heated and melted, and then the weld metal is formed. Tungsten electrode, melting.

The cell, the arc and the area of the joint heated by the arc are protected from atmospheric contamination by the argon gas stream.

a. High quality of weld seam, b. Small welding stress and deformation.

c. A wide range of weldable materials, d. Easy to master the operation technology.

e. Auxiliary machinery and tools can realize automatic production, and argon arc welding is suitable for:

welding of non-ferrous metals and alloy steels that are easy to oxidize (at present, Al, Mg, Ti and their alloys and stainless steel are mainly used); It is suitable for single-sided welding and double-sided forming, such as root welding and pipe welding; Tungsten TIG welding is also suitable for thin plate welding.

4.Gas welding: Gas welding refers to the use of combustible gas and combustible gas mixed by a certain proportion of the welding torch to obtain the required flame of flame properties as a heat source, melt the welded metal and filler metal, and make it form a firm welded joint.

Advantages: the equipment is simple, the scope of application is wide, and it can be welded in places where there is no electricity;