Why is the slag inclusion welding not good when the first layer of 5 mm steel plate is flat welded?

Manual arc welding welding flat welding of steel structure?

1. Select qualified welding process, welding rod diameter, welding current, welding speed, welding arc length, etc., and verify it through the welding process test.

2. Clean the weld: check whether the groove and assembly gap meet the requirements before welding, whether the positioning welding is firm, and there shall be no oil and rust around the weld.

3. The baking electrode should meet the specified temperature and time, and the electrode taken out of the oven should be placed in the electrode insulation barrel and taken at any time.

4. Welding current: select the appropriate welding current according to factors such as weldment thickness, welding level, welding rod model, diameter, welder proficiency and so on.

5. Arc initiation: The arc point of fillet weld should be at the end of the weld, which should be greater than 10mm, and the arc should not be played casually. The butt weld is combined with the timely joint and the fillet joint weld, and the arc striking plate and the leading plate are set at both ends of the weld, and the arc must be triggered on the arc striking plate and then welded to the weld area, and the halfway joint should be ignited at 15 20mm in front of the weld joint, and then the welding rod is returned to the beginning of the weld after the weldment is preheated, and the weld pool is filled to the required thickness before welding forward.

6. Welding speed: constant velocity welding is required to ensure that the thickness and width of the weld are uniform, and it is advisable to keep the molten iron and slag in the molten pool at an equal distance (2 3mm) from the inside of the mask.

7. Welding arc length: determined according to different electrode models, the arc length is generally required to be stable and unchanged, the acid electrode is generally 3 4mm, and the alkaline electrode is generally 2 3mm.

8. Welding angle: according to the thickness of the two weldments, the welding angle has two aspects, one is the angle between the welding rod and the welding direction is 60 75 °; Second, there are two cases of the left and right angles between the electrode and the weldment, when the thickness of the weldment is equal, the angle between the electrode and the weldment is 45°; When the thickness of the weldment is unequal, the angle between the electrode and the thicker weldment side should be greater than the angle between the electrode and the thinner weldment.

9. Arc receiving: At the end of each weld, the arc pit should be filled with arc pit and arc in the opposite direction of the welding direction, so that the arc pit is thrown in the weld bead to prevent the arc pit from biting meat. After welding, the arc plate should be cut off by gas cutting, and smoothed and smoothed, and it is not allowed to be knocked down with a hammer.

10. Slag removal: After the whole weld is welded, the slag is removed, and the welder's self-inspection (including appearance and weld size, etc.) is confirmed that there is no problem, and the location can be transferred to continue welding.

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It's because of this range, so if there is an object in the middle, he should stop, and people notice that he is still divided into versions.

If there is no way to weld well, first we need to look at the tools used in the welding part, and choose the position of the solder joint.

This is because it must be eaten in the middle when welding, otherwise it will be easy to break.

If the welding is not good, it may be an obstacle between the steel plates, and it is not easy to use, so it is not easy to use.

This situation occurs because there are some improper operations in the normal use process, which leads to low temperature and fusing of weld joints.

When the first layer of 5 mm steel plate is flat welded, the slag inclusion welding is not good, so it will not be strong, and the quality will be problematic.

Five-millimeter steel plate flat welding, why is it not good to sweat in the first layer? Definitely.

Causes of welding clamp bai slag:

1. The slag between the edge of the weld part, the weld layer and the weld bead is not removed.

DAO especially makes the reuse of alkaline electrodes, if the molten slag is not removed, it is more likely to produce slag inclusions.

2. The welding current is too small, and the heat obtained by the molten metal and slag is insufficient, which reduces its fluidity, and the solidification speed of the molten metal is fast, and the slag does not have time to float out.

3. During welding, the angle of the welding rod and the method of transporting the rod are inappropriate, and the slag and iron moisture can not be distinguished, which mixes the slag and the molten metal together, and hinders the floating of the slag.

4. Improper chemical composition of base metals and welding materials.

Why is there always slag inclusion in welded steel bars? It turned out that this was the reason, and there would be no more slag in the future.

It should be that the welding torch movement speed and feeding material are wrong, and the welding wire is not completely melted.

1.Slag inclusion.

BAI refers to the slag or other non-metallic impurities remaining in the weld. Causes of DAO: 1) The quality of the welding material is not good, and the weld ripples are inside.

too thick; 2) There is rust or other impurities on the weldment or slope day that has not been cleaned up

3) The slag of the Luo layer is not completely removed during the welding process;

4) The current is too small, and the welding speed is too fast;

5) Improper transportation.

2.In order to prevent slag inclusion, a reasonable welding specification and groove size should be selected before welding, and the correct operation process and the use of welding rods with good process performance should be cleaned on both sides, and the slag of each and each layer should be thoroughly removed when multi-layer welding, especially alkaline welding rods, and slag should be cleaned carefully and carefully.

When repairing slag inclusion defects, carbon arc gouging is generally used to remove the defective weld metal and re-weld.

The main reason is that the method of transporting the strip is incorrect, and the molten pool and slag are not distinguished.

How to solve the phenomenon of slag inclusion in time if there is a phenomenon of slag inclusion in the process of electric welding? 1 little trick to teach you.

Why is there always slag inclusion in welded steel bars? It turned out that this was the reason, and there would be no more slag in the future.

1. The welding current is small, the arc blowing force is weak, and there is no force to exclude the welding slag on both sides of the weld.

2. The arc is unstable caused by the wet electrode, and the arc instability cannot discharge the welding slag on both sides of the weld.

3. The surface of the base metal has oil stains, embroidery paint, etc., and within 20-30 mm on both sides of the weld, it should be polished with an angle grinder to expose the metallic luster. Otherwise, these debris invade the melt pool and form slag inclusions.

4. The method and angle of the transport strip are incorrect.

5. The welding method is incorrect, such as P ordinary J422 and other structural steel welding rods are vertically welded downward.

Why there is slag inclusion in electric welding, you will know the reason after reading it.

First of all, when you weld, you can not distinguish the capacity pool, if you can't see a clear molten pool, it means that your current is small, the arc is too high from the weldment, there will be gas and impurities into the slag inclusion, the angle is generally 75 85 degrees.

The welding speed should be uniform. Make sure every pool is the same.

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.

The commonly used welding methods are as follows:

1. Linear transport method. When this method of transportation is adopted, the welding rod does not swing horizontally, but moves in a straight line along the welding direction. It is commonly used for butt flat welding of grooves, first layer welding of multi-layer welding or multi-layer multi-pass welding.

2. Straight-line reciprocating method. When welding with this strip method, the end of the electrode swings back and forth along the longitudinal direction of the weld. It is characterized by fast welding speed, narrow weld seam and fast heat dissipation. It is suitable for the first layer of multi-layer welding with large gaps between thin plates and joints.

3. Zigzag transport method. In this method of welding, the end of the electrode is zigzag and moves forward, and stops on both sides for a while. The purpose of the oscillation is to control the flow of the molten metal and obtain the necessary weld width to obtain a better weld formation.

This method of transporting bars is widely used in production, and is mostly used for the welding of thick steel plates, the butt joints of flat welding, vertical welding, vertical welding and the fillet joints of vertical welding.

4. Crescent-shaped transport strip method. When welding with this rod method, the end of the electrode swings left and right in a crescent-shaped shape along the welding direction. The speed of the swing is determined according to the position of the weld, the form of the joint, the width of the weld and the value of the welding current.

At the same time, it is necessary to stay on both sides of the joint for a short time to allow sufficient penetration at the edge of the weld to prevent undercut.

The characteristics of this method are that the metal melts well, has a long holding time, the gas is easy to precipitate, and the slag is also easy to float to the surface of the weld, and the quality of the weld is higher, but the residual temperature of the welded weld is higher. The scope of application of this method is basically the same as that of the zigzag method.

5. Triangle transport method. When welding with this transport method, the end of the electrode moves in a continuous triangle and constantly moves forward. According to the different swing forms, it can be divided into two kinds of oblique triangle and regular triangle, and the oblique triangle transport strip method is suitable for the T-joint weld and the horizontal weld with groove in the position of flat welding and upward welding, and its advantage is that it can control the molten metal by the swing of the welding rod, and promote the weld to form well.

The regular triangle strip method is only suitable for the vertical welding of the butt joint and the T-joint weld of the bevel opening, and the characteristics are that it can weld a thick weld section at one time, and the weld is not easy to produce defects such as slag inclusion, which is conducive to improving production efficiency.

6. Circle-shaped transport method. When welding with this method of transporting bars, the end of the electrode continuously moves in a positive circle or oblique circle, and constantly moves forward. The positive circle transport strip method is suitable for welding flat welds of thicker weldments, and its advantages are that the molten pool exists for a long time and the metal temperature of the molten pool is high, which is conducive to the precipitation of oxygen, nitrogen and other gases dissolved in the molten pool, and is convenient for the slag to float.

The oblique circle strip method is suitable for the horizontal weld of T-joint weld and butt joint in flat and vertical positions, and its advantage is that it is conducive to controlling the molten metal from the influence of gravity and causing the phenomenon of spillage, which is conducive to the formation of weld.

The basic principle of DC welding machine current transformer and the drawing of circuit diagram.

The workpiece and the electrode are connected to different poles of the power supply (positive or negative), the electrode and the workpiece are in instant contact to ionize the air to produce an arc, the arc has a very high temperature, about 5000-6000k, so that the surface of the workpiece is melted to form a molten pool, and the metal of the electrode is melted and coated on the surface of the workpiece to form a metallurgical bond.

Electrical welding uses an arc to melt chemical parts at high temperatures to make them join.

...Uncle Tu doesn't know a lot, but there are many parts of electric welding, such as ordinary electric welding, and what gas shielded welding, acetylene welding, etc., is nothing more than using electricity or other things to melt the metal and glue the two things together in the process of cooling

Hello, if you don't knock the welding slag in the place where the joint is welded, will the slag be included to see how the welding technology is.

Requirements: Properly welded steel plates. Workpiece cleaning and preparation The workpiece is cleaned first, according to the thickness of the steel plate, bevels are made at both ends of the butt steel plate when necessary, and the 45° slope can be ground on the grinding wheel or filed with a file.

The welding specification includes the selection of the electrode and the selection of the welding current. According to the thickness of the workpiece and the shape of the groove, the diameter of the mild steel electrode is correctly selected, the diameter of the welding rod is selected when the thickness of the weldment is large, and the diameter of the welding rod is generally taken when the thickness of the weldment is greater than 4mm, and then the appropriate welding current is correctly selected according to the diameter of the electrode and the type of the workpiece to be welded. In the process of correct welding, it is necessary to wear arc protection masks and protective equipment, correct arc initiation, and flat welding.

The angle between the welding rod and the workpiece is appropriate, about 60°, the welding rod is fed downward, moving and swinging horizontally along the welding direction, and the moving speed must be uniform. After welding, the quality inspection is struck with a small hammer to remove the welding skin and slag inclusion on the weld until the fish-scale weld is exposed, and the quality of the weld should meet the requirements of the technical standards, and if there are obvious defects, it must be re-welded.

Hello, horizontal welding, horizontal plate welding, generally called flat welding. The welding position with the weld inclination angle of 0° 5 and the weld rotation angle of 0° 10° is called the flat welding position, and the welding carried out at the flat welding position is called flat welding. This kind of welding position belongs to the easiest position to weld in the whole welding position.

Flat welding, for example, a round pipe with a large diameter, draw the first line from the top, and then draw a line every 45 degrees, then: welding along the top line is flat welding, represented by the letter PA; The wire along which it is at an angle of 45 degrees is welded as flat fillet welding, also known as fillet welding, which is represented by the letters PB; Welding along the horizontal line is horizontal welding, which is indicated by the letter PC;