How to burn the best electric welding?

How to make the best welding possible, it is necessary to know the factors that affect the final formation of the weld. The factors that affect the forming of the weld are: welding speed, welding current, solution pool temperature and arc voltage.

If the welding speed is too fast and the melting temperature is not enough, it is easy to cause defects such as non-fusion and poor weld forming; If the welding speed is too slow, the high temperature residence time increases, the width of the heat-affected zone increases, the grain of the welded joint becomes coarse, the mechanical properties decrease, and the deformation of the weldment increases. When welding thinner weldments, it is easy to form burn-through.

Welding current - too small will make the arc unstable, resulting in defects such as lack of penetration, slag inclusion and poor weld forming. If the welding current is too large, it is easy to produce undercut, weld penetration, increase the deformation of the weldment and the amount of metal spatter, and also change the structure of the welded joint due to overheating.

The temperature of the dissolution pool - this should be judged by experience, (mainly depending on the color, the floating skin is dark red, and the molten iron is dark red.) If the temperature of the solution pool is sufficient, the miscellaneous materials and air in the base metal and the weld will be easily discharged, which is conducive to the good forming of the weld without producing bubbles.

Arc voltage - The arc voltage of electrode arc welding is mainly determined by the arc length: the longer the arc length, the higher the arc voltage, the reduction of the protection effect, and the easy to produce arc bias. In the welding process, short arc welding should be used as much as possible.

In fact, there is nothing to burn the welding, as long as you carefully understand every meaning of my sentence, and take action, I believe you will be able to weld well. If you don't believe me, try it, if you can't, come to me. The phrase is:

Always hold the welding speed, be good at observing the temperature of the solution pool, and be good at using three transportation methods, namely straight type, crescent type (you can see it in **, there is this shape) and Z-shaped.

Hehe, finally add know!

Adjust the appropriate current and weld with a short arc.

The following points should be paid attention to in the flat welding of kiss burning, so that the welding can be better: 1. Appropriate current. The current should be appropriately large to facilitate welding penetration and avoid slag inclusion.

2. Flat welding should maintain a uniform speed, and the transport strip should be stable. Welding generally swings the welding rod left and right in the middle plate, and the crescent-shaped transport strip is used. The thick plate can be curved and figure-8 to make the weld smooth and beautiful.

3. Short arc welding should be adopted, so that the welding slag can fall off automatically.

Welding is the method of electric welding or gas welding to weld broken or separated items, including electric welding.

Difference Between Electric Welding and Gas Welding:

1. The working principle is different.

Gas welding 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 the combination of atoms.

Electric welding refers to the use of electrical energy, through heating or pressurization, or both, and disturbing with or without filler materials, so that the weldment can achieve atomic bonding.

2. The basic operation process is different.

The main processes of gas welding are: ignition, adjusting the flame and extinguishing, and stacking the welding wave.

The main processes of electric welding are: arc starting, bar, and weld finishing.

Electric welding is a welding operation that uses the welding rod to melt the metal parts at high temperature through the arc and melt the places where the metal parts need to be connected. Its working principle is: through the commonly used 220V or 380V voltage, through the transformer in the welding machine to reduce the voltage, enhance the current, and make the electrical energy produce a huge arc heat to melt the electrode and steel, and the welding rod melting makes the integration between the steel higher.

Arc welding is the most widely used welding method, including hand arc welding, submerged arc welding, tungsten gas arc welding, plasma arc welding, MIG/MAG welding, etc. Due to the use of power supply in arc welding, the high-temperature arc generated by it is easy to cause fire**, and the danger is greater.

Electric welding is an economical, applicable and technologically advanced method in the processing of material joining. Welding with electricity can be achieved between almost any two metal materials, as well as between some metal digging materials and non-metal materials; It can be realized to make a large, economical and reasonable structure from small to large; Materials with different properties can be used in different parts of the structure to give full play to the characteristics of various materials; Welding parts have the characteristics of good air tightness and light weight; Welding with electricity can also be used to weld between ultra-thin and ultra-fine materials.

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 has a decisive impact on 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 of the welding industry has brought unprecedented development opportunities.

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.

As for the welder, it is cold in winter and hot in summer. Because welding produces a large amount of high temperature and ultraviolet radiation, so no matter how hot you have to wear good work clothes, and then there is welding, there is generally no heating equipment in the location, so it is particularly cold when welding in winter, and it takes 4-5 hours to do general welding, and the legs are numb. And it is easy to be burned by splashes and welds, welding soldering strips, very often.

Then there is the burning of the eyes by the arc light, and I dare not open my eyes for a day, and I still cry. I've been welding for 5 years, so I'm very impressed. However, the labor intensity of welders is not high, and the labor intensity is lower than that of other types of work.

Nothing affected and my body was fine.

With the development of production, welding is widely used in aerospace, aviation, nuclear industry, shipbuilding, construction and machinery in the 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 development of rapid disadvantages, 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 or 10 years, and many excellent welders in the market have a monthly salary of more than 10,000 yuan, and the salary is also very considerable.

The key to electric welding is manual work!!

It is a theoretical + practical effort: it is rough work, but it actually needs to be very fine in practice. It is a combination that requires the trinity of hands, eyes, and heart.

A good welder has gone through thousands of welding operations to achieve real kung fu!

Electrode arc welding operation technology].

In order to ensure the stable combustion of the welding arc and the surface forming of the weld, after the arc is ignited, the electrode should move in three directions.

1) The electrode is continuously fed into the weld pool.

2) The electrode moves forward along the welding direction.

3) The electrode swings horizontally.

When the electrode moves, it should be at an angle of 70-80 degrees to the forward direction, and push the melted metal and slag to the rear, otherwise the slag flows to the front of the arc, which will cause slag inclusion defects.

In order to obtain a wide weld seam, the electrode also has to make the necessary oscillation during feeding and moving. The usual shipping method is as follows:

1) Linear transport strip method.

2) Straight line reciprocating transport method.

3) Zigzag transport method.

Plate-shaped welding method.

Flat welding: After the arc is drawn to the welding place, the arc is lowered, and a "poof" sound is heard, and the welding rod is quickly lifted to extinguish the arc after seeing the hole melted by the arc. Then re-ignite the arc at 1 2 of the pool seat and cycle sequentially to complete the entire weld.

Filling: Make a short stop on both sides of the bevel. The welding speed is uniform, and the joints are staggered as much as possible when multi-layer beads.

Cover: Melt about 1mm on both sides of the groove, and finally fill the arc pit before extinguishing the arc.

Vertical welding: After the arc is triggered during priming, the arc is slightly elongated to preheat the base metal, and then the straight line is transported to the welding place to lower the arc, break through the groove, and quickly extinguish the arc after the formation of the molten pool, so that the molten pool temperature is slightly lowered and the arc is re-triggered immediately. Cycle sequentially to complete the entire weld.

Filling: Stay on both sides of the groove for a while, so that the temperature in the middle of the weld bead is uniform and the weld is smooth.

Cover surface: mostly use zigzag mode to transport the bar, the method is the same as the filling layer, and the groove is melted about 1mm on both sides.

Horizontal welding: generally using the oblique zigzag transport strip method, the welding rod maintains a 60-70 ° inclination angle, in order to prevent the upper edge undercut and the lower edge of the iron dripping caused by poor root forming, the operation method is still to suppress the arc, break through the groove, and quickly extinguish the arc after forming a molten pool.

Filling: Appropriately increase the current to penetrate the molten sharp corners that appear at the upper side groove, and generally use multi-layer multi-pass welding.

Cover: straight line transport strip, bottom-to-top row welding, each weld should cover the front weld 1 3.

Upside welding: the forward inclination angle of the electrode is 70-80° and walk in a straight line, depress the arc, quickly extinguish the arc after breaking through the groove, re-start the arc when the temperature of the molten pool drops slightly, cycle in turn, pay attention to the accuracy of the arc, and the welding layer should be thin.

Filling: The current should be increased appropriately, the transportation method can be zigzag or crescent-shaped, the groove on both sides of the stop is slightly longer, and the arc is stable, and the weld bead should be thin, and the temperature of the molten pool should not be too high to avoid the metal falling.

Cover: The operation method and essentials are the same as the filling. Melt about 1mm on both sides of the groove.

Flat welding should maintain a uniform speed, and the transport strip should be stable. Generally, it is a crescent-shaped transport strip that swings left and right.

Answer: Vertical welding is a more difficult way to weld in welding, under normal circumstances, it is a small current of about 100A for welding, pause more on both sides, and a little faster in the middle.

This is a technical job, and it must be practiced more, just like a sharpshooter, which is generally fed with bullets.

1. Appropriate current. The current is not more than 30 times the diameter of the electrode.

2. The right angle. The flat welding angle is generally 45° between the electrode and the weldment.

3. Appropriate techniques. You can use curved shapes, figure 8 shapes, round shapes and other techniques.

4. Suitable speed and uniform speed.

e Diagonal triangle carrier. Pause slightly on both sides of the weld and go faster in the middle to avoid undercuts.