What are the current job prospects for TIG welding and CO2 gas shielded welding??? 10

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.

Some of our company's products are gas shielded welding machines, but they are mainly aimed at the auto repair industry.

Frankly, as far as I feel, this line of work is relatively stable, but the area is also relatively small.

It's okay to make a living, but if you want to get a good salary or be a small boss yourself, you must have excellent skills.

Argon arc welding is the use of argon as the protective medium, carbon dioxide gas shielded welding used in the protective medium of carbon dioxide gas shielded welding.

According to different electrode materials, argon arc welding is divided into two types: tungsten argon arc welding and melting pole argon arc. CO2 gas shielded welding has only the melting pole.

in production applications. TIG welding has a wide range of materials, and almost all materials can be welded. Carbon dioxide gas contains mainly used for carbon steel and low alloy steel welding.

1.Carbon dioxide gas arc welding (CO2 welding for short) is a method of welding with carbon dioxide gas as the shielding gas (sometimes using a mixture of CO2+AR).

It is easy to operate in terms of application and is suitable for automatic welding and all-round welding. Poor wind resistance during welding, suitable for indoor operations.

Due to its low cost, carbon oxide gas is easy to produce and is widely used in enterprises of all sizes.

Due to the special influence of the zero thermophysical properties of carbon dioxide gas, when using a conventional welding power supply, it is impossible for the molten metal at the end of the welding wire to form a balanced axial free transition, and it is usually necessary to use a short circuit and a molten droplet necking explosion, so there is more spatter than the free transition of MIG welding.

However, if a high-quality welding machine is used, the parameters are selected appropriately, and a very stable welding process can be obtained, so that the spatter can be reduced to a minimum. Due to the low cost of shielding gas** used, the weld seam is well formed with short transitions, and the use of welding wire containing oxygen absorber results in high-quality welded joints with no internal defects. Therefore, this welding method has become one of the most important welding methods for ferrous materials.

2.Manual soldering is a basic operation skill in the assembly of electronic products, which is suitable for product trial production, small batch production of electronic products, debugging and maintenance of electronic products, and some occasions that are not suitable for automatic welding.

It is a soldering process that uses a soldering iron to heat the soldered metal parts and tin-lead solder, and the molten solder wets the heated metal surface to form an alloy, and connects the soldered metal parts after the solder solidifies, so it is also called soldering.

3.A type of extremely inert gas shielded welding (TIG).

It is a welding method that uses arc heat to melt the base metal and filler wire under the protection of argon to form a joint missing joint.

It mainly controls three parameters: welding current, welding speed and argon flow. Compared with manual welding, the arc and weld pool are visible and easy to operate; Sheet metal structures that can be welded to active metals; Weld seam***, the joint strength can reach 80% 90% of the base metal. In 1930, inert gas shielded welding was invented in the United States, and in 1957, China began to use tungsten argon arc welding.

It can weld stainless steel, high-temperature alloy, titanium alloy, aluminum alloy and other materials, and is used in nuclear energy, aerospace, shipbuilding, electronics, metallurgy and other industries.

1. The process is different: the process of argon arc welding is a welding example The material used for economizer, evaporation section pipe bundle, water wall and low-temperature superheater is 20 steel, and the high-temperature superheater tube is 12cr1mov. Preparation before welding Before welding, the nozzle should be beveled at 30°, and the metal color should be polished within 15mm inside and outside the pipe end.

The pipe to the mouth clearance is 1 3mm.

When the actual counterpart gap is too large, the transition layer needs to be surfacing on the bevel side of the pipeline. Set up temporary shelter facilities to strictly control the wind speed at the welding operation, because the wind speed exceeds a certain range, it is easy to produce pores. Operation Using WST315 manual tungsten argon arc welding machine, the welding machine itself is equipped with a high-frequency arc striking device, which can use high-frequency arc striking.

Arc extinguishing is different from electrode arc welding, if the arc is extinguished too quickly, it is easy to produce arc pit cracks, so the weld pool should be led to the edge or thicker part of the base metal during operation, and then gradually shrink the molten pool and slowly extinguish the arc, and finally close the shielding gas.

The process of carbon dioxide shielded welding is to laminate the special welding wire to the damaged part of the workpiece through the high thermal energy generated by the instantaneous discharge of microelectricity, and firmly weld with the original substrate, and only need to go through a little post-processing of grinding and polishing after welding.

2. Different advantages: the advantages of argon arc welding are stable arc combustion, heat concentration, high arc column temperature, high welding production efficiency, narrow heat affected zone, and small stress, deformation and crack tendency of the weldments welded. The electrode loss is small, the arc length is easy to maintain, and there is no flux or coating layer during welding, so it is easy to realize mechanization and automation.

The advantages of carbon dioxide shielded welding are that the heat-affected area is small, the collapse cover is high-precision, the welding strength is high, and it is easy to carry. The design is reasonable, free to adjust, and different discharge frequencies can be selected according to different metal materials to achieve the best repair effect.

3. The disadvantages are not completely the same: the disadvantages of argon arc welding are because of the large heat-affected area, and the workpiece often causes deformation, hardness reduction, sand hole, local annealing, cracking, pinhole, wear, scratches, undercuts, or insufficient adhesion and internal stress damage after repair.

The disadvantage of CO2 shielded welding is that when using a conventional welding power supply, it is impossible to form a balanced axial free transition of the molten metal at the end of the welding wire, and it is usually necessary to use a short circuit and a molten droplet necking burst, so there is more spatter than the free transition of MIG welding.

It should be easy to get started with CO2 welding practice. Handle welding pays more attention to the observation of the weld pool and the change of the electrode angle.

Manual arc welding uses a variety of methods to protect the weld pool from atmospheric contact. The heat energy is provided by the electric arc. As with MIG welding, the electrode is self-consuming.

The metal electrode is coated with a mineral flux, which forms slag to cover the weld pool when the flux melts. The coated flux releases a gas-shielded weld pool containing alloying elements to compensate for alloy losses in the alloy pool.

Carbon dioxide gas shielded welding is one of the welding methods, which is a method of welding with carbon dioxide gas as the shielding gas. It is easy to operate in terms of application and is suitable for automatic welding and all-round welding. There can be no wind during welding, which is suitable for indoor work.

Manual arc welding is a method of using the heat of the arc between the electrode and the weldment to melt the metal by using the heat of the arc between the electrode and the weldment as two electrodes. Carbon dioxide gas shielded welding is a gas liquid-holding punching welding method that uses carbon dioxide gas as the shielding gas and relies on the electric arc generated between the welding wire and the weldment to melt the metal.

If it is a pressure vessel, it cannot be shielded by carbon dioxide gas shielded welding, and can only use manual arc welding, submerged arc automatic welding and argon arc welding. The longitudinal seam of the welding cylinder and the large-diameter annular seam should be automatically welded with submerged arc, and manual arc welding can be used if it is not convenient for automatic submerged arc welding. The upper tube is planted with manual arc welding; For the welding bead of single-sided welding and double-sided forming, it is advisable to use argon arc welding as the base, manual arc welding cover or submerged arc automatic welding mask.

Second, welding is better.

Argon arc welding and secondary welding are commonly used welding methods, in the actual application, it is still necessary to choose the appropriate welding method according to the welding material, requirements, occasions, etc. For example, although the welding efficiency of argon arc welding is low, the welding quality is better than that of secondary welding, the welding heat input is small, and the welding deformation is small.

So depending on what the welding requirements require, then choose the right welding method.

Welding preparation: 1. Before welding, the joint cleaning requires that the burrs, oil, rust and oxide scale that affect the quality of the weld within 30mm on both sides of the groove must be cleaned.

2. When the construction environment temperature is lower than zero or the carbon equivalent of the steel is greater than that, and the structural rigidity is too large, and the object is thicker, preheating measures should be used before welding, the preheating temperature is 80 100, and the preheating range is 5 times the thickness of the plate, but not less than 100mm.

3. When the thickness of the workpiece is greater than 6mm, in order to ensure the welding penetration strength, the butt edge of the plate should be cut V-shaped or X-shaped, the groove angle is 60 °, the blunt edge p is 0 1mm, and when the plate thickness difference is 4mm, the butt edge of the thicker plate should be skewed.

The above content reference: Encyclopedia - two welding protection.

Argon arc welding and secondary welding are different welding methods, no one is better than the other, the work of argon arc is finer, and the efficiency of secondary welding is high.

Hello, argon arc welding is generally used for base welding, manual welding is usually used to cover the surface, or where there are obstacles, because manual welding is more convenient, carbon dioxide protection welding is often used inside the factory.

The materials and quality of welding are different. For example, manual welding of aluminum cannot be welded because the oxidation is too fast. The heart must be completed by gas shielding welding.