There are multiple hazards of argon arc welding aluminum welding, and it is compared with welding ir

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.

Welding iron, stainless steel, aluminum, three types. Welding aluminum wages are the highest, why? Because is it the hardest? Of course not, because it hurts people the most.

Nowadays, life is getting better and better, so we don't know a lot about some common sense of life, and there are a lot of products we want to use, but there are some products that have certain hazards, so we must be clear about how many hazards there are before using materials. Nowadays, life is getting better and better, so we don't know a lot about some common sense of life, and there are a lot of products we want to use, but there are some products that have certain hazards, so we must be clear about how many hazards there are before using materials. Next, let's share with you how much more harmful aluminum welding is than iron welding?

Methods and techniques of aluminum welding?

Aluminum welding is much more harmful than iron welding

Aluminum welding is highly toxic, at high temperatures, metal iron and aluminum will be partially oxidized, and iron oxide does not harm the human body much, while aluminum oxide can cause Alzheimer's disease, that is, Alzheimer's disease. Therefore, iron welding is mainly the toxicity of gas and flux, while aluminum welding also has more alumina toxicity.

Methods and techniques of aluminum welding?

Tool Material: Required Special Aluminum Wire Feeding Tools: Non-metallic Liner, U-Slot Drive Roller, Inlet and Outlet Guide Device, Contact Head Operation Method 1 Load the welding wire to the welding machine and hold the welding wire shaft with one hand without loosening, unwrap the cellophane package, and hold the other end of the wire release with the other hand (let go only after putting in the drive roller) ps:

Hold the loose end tightly, otherwise the whole bundle of wire will come loose.

2. Adjust the tightness of the wire brake, first adjust the tightness to the gear, then install the welding wire, and let it roll through the driving wheel. PS: The tightness is just so that the welding wire will not loosen, not too tight and not too loose.

If the welding wire roller moves, and the other parts do not move, it is not tight enough; 3. Set the tightness of the driving roller, and first place the wire head at a slight angle 1 inch away from the surface of the insulating material; After that, set the roller tightness to almost; Press the torch switch to see if the wire is sliding when it touches the surface of the insulating material; From that point on, adjust the tightness until the wire stops slipping. PS: Pay attention not to be too tight, too tight the wire will break.

Secondly, it is necessary to take safety measures and wear welding gloves to avoid burns.

Special reminder precautions: make sure that the power connection is good; Do a good job of cleaning and use a degreasing solvent to remove all the grease; Ensure the dryness of the surface of the workpiece before welding; Do not approach combustible materials when welding; Use a clean stainless steel wire brush to remove the surface oxide of the clean aluminum; When welding, the torch cable should be straight.

The above introduction of aluminum welding is much more harmful than iron welding, and all the knowledge of aluminum welding methods and skills, I hope to help you. After reading this article, you should have a certain understanding of these two materials, and when we use welding, we must have a certain understanding of them in order to be able to use them better. If you still want to know about the relevant knowledge, you can continue to ****.

Summary. The reason why aluminum welding has a higher salary than iron welding is mainly because aluminum welding is a high-risk job. Not only is the risk higher than that of iron welding, but also the long-term bending action is particularly harmful to the cervical and lumbar spine.

The reason why aluminum welding is higher than iron welding is that if aluminum welding is a high-risk job. Not only is the risk of segment chain higher than that of iron welding, but also there is a bending action for a long time, which is particularly harmful to the cervical and lumbar spine bridge hail.

Aluminum welding method: low-temperature M51 with M51-F welding wire welding in the working temperature of 179 degrees of the environment operation, for the welding material of the Paga affinity is better, mostly used for deformation control requirements, or particularly thin in the case of welding; WE53 low-temperature aluminum electrode for the welding of 7 series of aluminum alloys, the welding working temperature is 380-400 degrees, the advantage is that there is no need for pure wax to assist any flux welding when welding, so as to prevent some flux residues from being left in the welding process, and the welding strength is very high, which can solve the welding of 3 series aluminum alloy and castings, or die castings; Q303 low-temperature aluminum welding wire also reflects some special advantages for aluminum alloy weldability, which is the narrow gap welding with a low angle.

No, argon arc welding iron is relatively easy to use, and it can be used when the basic materials are fused.

TIG welding: DC TIG welding machine is used to weld iron, and AC TIG welding machine is used to weld aluminum. On the basis of the principle of ordinary arc welding, the technology uses argon to protect the metal welding consumables, and melts the welding consumables into a liquid state on the welded substrate to form a molten pool through high current.

A kind of welding technology that makes the welded metal and the welding material achieve metallurgical combination, because argon gas is continuously sent in the high-temperature melt welding, so that the welding material can not contact with the oxygen in the air, thereby preventing the oxidation of the welding material, so it can weld stainless steel, iron hardware metals.

Gas shielded welding: NBC's gas shielded welding machine is used to weld iron, and double-pulse gas shielded welding is used to weld aluminum.

What is the difference between the operation method of argon arc welding aluminum welding and the operation method of welding iron.

Argon arc welding welding aluminum, magnesium alloy:

The weldability of aluminum-magnesium alloys is difficult to grasp compared with the weldability of ferrous metals. The main reason is that the surface of the aluminum-magnesium alloy is oxidized at room temperature to form a layer of refractory oxide film, which is dense and beneficial to natural anti-corrosion, but extremely unfavorable to welding.

This layer of film brings great difficulties to welding, there is no color difference when melting, it is difficult to observe the degree of melting, and it is even easy to cause the welding and heat affected zone to collapse in large blocks, and a large number of convex and concave phenomena are formed on the back, which destroys the formation of weld metal. At high temperature, the strength is low (the tensile strength is only about 1kg cm at 370), the melting point of the oxide film is very different from that of the base metal, and the melting point of the oxide film is about 2050.

The melting point of aluminum-magnesium is only about 600, this large temperature difference brings many difficulties to welding, this layer of alumina film hinders the fluidity of the molten pool, and is easy to cause slag inclusion in the welding process, resulting in hidden dangers of welding quality such as non-fusion, non-penetration, and false welding. Moreover, the oxide film also adsorbs more water, which will promote the formation of pores in the weld during welding, and the H2 pores come from the water, and at the same time are related to air, oxide film, argon and other factors.

For aluminum and magnesium these metals that are easy to oxidize, there is a very thick passivation film on the surface, and the current can not easily break down the surface of the passivation film during welding, if the DC connection is reversed, this problem can be solved, and the positive ion argon in the arc atmosphere can rush to the workpiece connected to the negative electrode at high speed, and the passivation film will be broken, so as to achieve the role of cathodic cleaning.

However, the tungsten electrode is easily overheated due to the long-term righting of the tungsten electrode, which can lead to melting. Therefore, the concept of tungsten electrode heat dissipation is introduced, so it cannot be implemented by DC connection alone. The polarity of the AC current changes periodically, and in each cycle half wave is equivalent to DC positive connection and the other half wave is equivalent to DC reverse connection.

The tungsten electrode will not overheat during the half-wave of the positive connection, and can carry a large welding current, which is conducive to the stability of the arc and the increase of the allowable welding thickness. There is a cathodic cleaning effect during the half-wave of reverse connection, which can remove the oxide film on the surface of the base metal and ensure that the weld is well formed.

When using AC tungsten argon arc welding, the AC current will break the oxide film formed during welding, so the strength and quality of the welded joint can be guaranteed. The alternating current itself has the function of cathodic crushing, which can crush the oxide film, and the use of AC tungsten argon arc welding machine uses alternating current to have the function of cathodic crushing. AC argon arc welding can automatically remove the oxide film on the surface of the weldment during the welding process, so it can successfully weld some chemically active non-ferrous metals, such as aluminum, magnesium and alloys.

Aluminum argon arc welding and aluminum gas welding have their own advantages, and it is not possible to say which one is better than the other, but only which occasion is more suitable.

1. Structural links with particularly high strength requirements, such as bicycle frames, fitness equipment, and aluminum argon arc welding is recommended for such strong stress parts.

Second, large structural parts or machined seals are generally welded by aluminum argon arc welding, such as aluminum barrels, aluminum containers, etc., because these need to withstand pressure, and the thickness is thick, it is more difficult to heat up with gas welding, the temperature is slow, and the heat dissipation, and the uneven temperature directly affects the welding effect of gas welding.

3. If the product is ultra-thin, or the heterosexual structure is thin and thick, it is recommended to use aluminum alloy gas welding welding, at this time, you can use low-temperature aluminum electrodes, such as using low-temperature 430 degrees of Weiodin 303 low-temperature aluminum electrodes to weld the tube of aluminum radiator, or aluminum capillary, aluminum mouth tube, or low-temperature 385 degrees of welding such as thin die-casting aluminum.

Summary: Aluminum argon arc is recommended for mechanical stress and high voltage requirements, aluminum gas welding is recommended for deformation requirements and ultra-thin parts or heterosexual parts or aluminum castings.

Both welding methods can weld aluminum. The main differences are as follows:1

In terms of welding forming: argon arc welding aluminum is much more beautiful; 2.Welding Quality:

The welding quality of argon arc welding is stable, and gas welding can also ensure the welding quality; 3.Welding speed: Gas welding is two to three times the speed of argon arc welding.

The main applications can be found in the production of aluminum radiators for automobiles.

The basic skills of the double-pulse aluminum welding machine and the ordinary NBC two-guarantee welding method should be the same from a macroscopic point of view, that is, the basic skills are similar, but because the power supply mode and output mode are different, the operation method is accurate to say that the same operator welds on the same operating matrix, and the double-pulse one is better than the two-guarantee welding, which is said here that the output of the power supply has a great impact on the forming and even spatter.

It's not the same, TIG welding.

Soldering iron is relatively easy to use, and can be used when the basic materials are fused.

TIG welding: Welding iron is.

DC argon arc welding machine, welding aluminum is.

AC argon arc welding.

Machine. Technology is in the ordinary.

Arc welding. on the basis of the principle of utilization.

Argon. on metal.

Welding consumables. The protection is formed by melting the welding consumables into a liquid state on the substrate to be welded by high current. Melt pools.

Make the welded metal and welding consumables reach.

Metallurgical bonding. one.

Welding technology, because argon gas is continuously sent in high-temperature melt welding, so that the welding consumables can not contact with the oxygen in the air, thereby preventing the oxidation of the welding consumables, so it can weld stainless steel, iron and metal metals.

Gas shielded welding: NBC's gas shielded welding machine is used for welding iron, and aluminum is welded.

Double pulse. Gas shielded welding.