Gas shielded welding technology, tips for beginners of gas shielded welding

1: Clean the sanitation of the vertical welding position, focusing on grease, positioning solder slag and water.

2: To know the size of the welding angle to be welded, first burn a standard welding angle according to the size of the welding angle. Note: High-quality welding must be from the bottom up!

3: Start arc striking by the standard welding angle, pay attention not to exceed the range of the molten pool {formed by the full dissolution of the welding wire} when the welding wire swings left and right, pause on both sides when swinging left and right, and determine the welding angle for the length of time. When swinging from side to side, be sure to control the rhythm and slowly weld up.

Extended information: Carbon dioxide gas arc welding (CO2 welding for short) is a welding method using carbon dioxide gas as the shielding gas. (Sometimes CO2+AR gas mixtures are used).

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 dioxide gas is easy to produce and is widely used in large and small enterprises.

Introduction to the advantages. 1. Low welding cost. Its cost is only 40 50% of submerged arc welding and electrode arc welding.

2. High production efficiency. Its productivity is 1 4 times that of electrode arc welding.

3 Easy to operate. Open arc, no limit to the thickness of the workpiece, can be welded in all positions and can be welded downward.

4. High crack resistance of welds. The weld is low in hydrogen and also has less nitrogen.

5. The deformation after welding is small. The angular deformation is 5 thousandths, and the unevenness is only three thousandths.

6. Small welding spatter. Welding spatter can be reduced when ultra-low carbon alloy or flux-cored wires are used, or AR is added to CO2.

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.

Tips for Beginners in Gas Shielded Welding:

1. During the welding process, there will be spatter. The larger the voltage ratio, the less splashing, the larger the particles, the higher the heat, and it is not easy to clean. The smaller the voltage ratio, the greater the splash and the smaller the particles, the easier it is to clean. It is recommended to paint both sides of the weld before welding.

2. Left welding method: shallow penetration, easy to observe the weld, large width, small reinforcement and small spatter. Non-ferrous metals must remain welded.

3. Correct welding method: deep penetration, easy to observe the molten pool, small width, large margin, large spatter.

4. When welding, the nozzle should not be raised too high, which is easy to cause porosity and skipping. The nozzle is about 8 15mm from the weld. Don't press too low.

If the weld is too low and not easy to observe, it will burn out the nozzle. If the wire feeding speed is too fast, porosity, poor weld forming, and carbon dioxide will be generated.

The gas should not be too much, the splash will be too much, and the exhaust gas.

Welding process: 1. Welding of plate joints, longitudinal and horizontal cross welds, first weld end welds, and then weld side welds.

2. When the length of the joint is greater than 1m, the method of split symmetrical welding or gradual desoldering should be adopted. 3. When the butt joint and fillet weld on the shelf.

In the case of simultaneous existence, the butt weld of the plate is welded first, then the butt weld of the frame is welded, and finally the fillet weld of the shelf and the plate is welded.

4. All symmetrical objects are welded from the center to the head and tail directions, and the left, right and direction are symmetrical.

Welding materials: 1. Carbon dioxide gas purity, water content.

Not exceeded, the carbon content does not exceed.

2. Low carbon steel.

important structures and welding wires.

Grade high-strength low-alloy steel welding selection H08MN2SIA; The general structural welding of low carbon steel uses H08MN2SIA. Rust spots are not allowed on the copper-plated surface of the welding wire.

Good afternoon, dear, I'm honored to answer for you. The operation method and use of gas shielded welding are as follows: Demonstration of welding techniques of gas shielded welding

1. Clean up the weld bead at the vertical welding position, focusing on grease, positioning solder residue, water, etc.; 2: To know the size of the welding angle to be welded, first burn a standard welding angle according to the size of the welding angle. 3. Pay attention to high-quality welding must be from bottom to top; 4. Start arc striking by the standard welding angle, pay attention not to exceed the range of the molten pool {formed by the full dissolution of the welding wire} when the welding wire swings left and right, pause on both sides when swinging left and right, and determine the length of time depending on the welding angle. 5. When swinging left and right, we must control the rhythm and slowly weld up, and pay attention to the hand must be stable, which is a necessary prerequisite for high-quality welding. How to use the gas shielded welding machine: 1. The suction performance and air tightness must be checked before using the welding torch, and the connecting parts, gas energy channels and regulating valves of the welding torch shall not be stained with grease; 2. The gas shielded welding machine actually has the characteristics of descending, turning 220V and 380V alternating current into low-voltage direct current, and the gas shielded welding machine can generally be divided into two types according to the type of output power supply, one is the alternating current gas shielded welding machine; One is the DC gas shielded welding machine; 3. Pulse gas shielded welding machine is a welding method that uses pulse current to achieve droplet transition, no spatter, large penetration, fine grain, high weld strength, suitable for full-position welding, from 20 A to 500 A can achieve stable and high-quality welding, welding performance is far better than ordinary gas shielded welding machine, is the mainstream direction of welding machine development.

Summary. Kiss! Gas shielded welding refers to the welding method of carbon dioxide or argon protection, without the use of welding rod and welding wire.

CO2 welding efficiency is high, and argon shielded welding mainly welds aluminum, titanium, stainless steel and other materials. Submerged arc welding is welding with welding wire and flux protection. The flux buries the arc like sand.

It is mainly used for welding thick plates. The hazard of gas shielded welding is that arc and dust have a great impact on the health of welders.

The operation method and use of gas shielded welding.

Kiss! Gas shielded welding refers to the welding method of carbon dioxide or argon protection, without the use of welding rod and welding wire. CO2 welding efficiency is high, and argon shielded welding mainly welds aluminum, titanium, stainless steel and other materials.

Submerged arc welding is welding with welding wire and flux protection. The flux buries the arc like sand. It is mainly used for welding thick plates.

The hazard of gas shielded welding is that arc and dust have a great impact on the health of welders.

Kiss! The operation method of gas shielded welding is as follows: the operation method of carbon dioxide gas shielded welding, according to the moving direction of the welding gun, can be divided into left welding method and right welding method, when the right welding method is adopted, the molten pool can be well protected, and the heating is concentrated, the heat can be fully utilized, and due to the blowing force of the arc, the molten pool metal is pushed to the rear, and the weld with a relatively full shape can be obtained.

However, it is inconvenient to observe during welding, it is not easy to accurately grasp the welding direction, and it is easy to weld deviation, especially when welding butt joints. When the left welding method is adopted, the arc has a preheating effect on the weldment; Although it is difficult to observe the weld pool in the left welding method, it can clearly see the head to be welded, and it is easy to grasp the welding direction and will not deviate. Therefore, carbon dioxide gas shielded welding generally adopts the left welding method.

Kiss! Purpose: Arc Initiation:

Carbon dioxide gas shielded welding generally adopts the direct short-circuit contact method for arc striking, due to the use of arc welding power supply with flat characteristics, its no-load voltage is low, resulting in arc initiation difficulties, and the welding wire and the weldment should not be in contact too tightly during arc striking, if the contact is too tight or the contact is poor, it will cause the welding wire to burn out in sections. Therefore, the extension length of the welding wire should be adjusted before arcing, so that the end of the welding wire and the weldment should be kept at a distance of 2 3mm. If there is a thick spherical head at the end of the welding wire, it should be cut off with pliers, because the spherical end is equal to the diameter of the welding wire, and the surface of the spherical end is covered with a layer of oxide film, which affects the quality of the arc strike.

Before arc starting, the appropriate position should be selected, and the welding speed should be flexibly mastered after the arc starting, so as to avoid defects such as unwelded penetration and porosity at the arc starting point of the weld.

Arc extinguishing: At the end of welding, if the arc is cut off suddenly, the arc crater will be left behind, and defects such as cracks and porosity will be generated at the arc pit. Therefore, it is necessary to stop at the arc pit for a while, and then slowly lift the welding torch, so that the arc pit can be filled and the molten pool metal is still well protected before it solidifies.

Misunderstanding of novice gas shielded welding, how to avoid undercuting, vertical welding uses anti-crescent!

I think the gas shielded welding you said should be carbon dioxide shielded welding, this is very simple, much easier to learn than electric welding, the welding nozzle should be closer to the workpiece when the second protection welding, so that there will always be bubbles, if you want to learn, I can teach you by hand. Okay, I'm looking forward to adopting it after answering.

Hello dear, <>

The welding method of carbon dioxide gas shielded welding vertical welding is as follows: the penetration depth of upward vertical welding is large, and it is easy to weld through. Although the lower part of the molten pool is supported by the weld, the bottom of the molten pool is an inclined plane, and the molten metal is relatively easy to flow under the action of gravity, so it is difficult to ensure that the surface of the weld is flat.

In order to prevent the molten metal from flowing down, it is necessary to use a slightly smaller current than flat welding, the swing frequency of the welding torch should be slightly faster, and the swing mode with a small zigzag pitch is used for welding, so that the molten pool is small and thin, and the droplet transition adopts the short-circuit transition form. I hope my answer is helpful to you, and I wish you good health and a happy mood! <>