What does the V and A of the second guarantee welding mean, and what does the second guarantee weldi

The questions are answered in a standardized manner and are answered in a written test.

Try the parameters in practice:

Layer 1 primer: current 120 150A voltage 19 21V second layer filling: current 200 230A voltage 26 28V third layer cover:

The current is 190 220A, the voltage is 26 28V, and the parameters should be adjusted according to the speed of hand welding, and the practice requires welders to be proficient in welding technology.

I hope I'm satisfied

The principle of the second welding is that the welding wire and the weldment are used as two electrodes to generate an electric arc, and the heat of the arc is used to melt the metal, and carbon dioxide gas is used as the shielding gas to protect the arc and the molten pool, so as to obtain a good welding joint.

1. The full name of the second protection welding is: carbon dioxide gas shielded welding, which is a welding method.

2. This welding method has become one of the most important welding methods for ferrous metal materials.

3. Features: 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.

Erbao welding is to use carbon dioxide to protect the weld, the full name is Ersuisuichang carbon oxide gas shielded welding, belongs to automatic or semi-automatic equipment, the welding speed is fast, the weld bead tensile is strong, the deformation is small, but the welding speed is fast and there are many problems, such as large spatter, undercut, fusion is not good to guess, etc., mainly used for steel structure welding, and the windy site can not be welded, mostly in the plant construction.

2. Welding: As the name suggests, inert gas dioxane carbon is added during the welding process to form an effective protective cover around the welding area, so that the welding balance material and the base metal can be fully integrated, reducing welding defects, etc. It is characterized by high efficiency and high speed.

At present, domestic shipbuilding, steel structure high-rise buildings, etc. mostly use two-guarantee welding.

The second protection welding is carbon dioxide protection welding, and the welding wire is constantly automatically fed during welding, and at the same time, the carbon gas of the two cleverly spine oxidation Shifeng is also continuously sprayed to the welding, which plays the role of isolating the air and searching for a wide time, avoiding the oxidation of molten iron, so that it can achieve higher strength, and the welding strength is higher than that of general arc welding, and the quality is much better. So the second protection welder you are talking about is the worker who does carbon dioxide protection welding

The full name of the second protection welding is carbon dioxide gas shielded Kailu welding. It is a semi-automatic MAG welding, carbon dioxide gas protection, and a welding method that uses solid core or flux-cored wire as solder.

The definition is different: gas shielded welding refers to the welding method of carbon dioxide or argon protection, without the use of welding rod and wire.

The full name of the second shielded welding is: carbon dioxide gas shielded weldingCarbon dioxide gas shielded welding is one of the welding methods, which is a method of welding with carbon dioxide gas as the shielding gas.

TIG welding is a welding technology that uses argon as a shielding gas.

The full name of the second shielded welding is: carbon dioxide gas shielded welding.

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.

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.

Second, the full name is carbon dioxide gas shielded welding and pressurized gas shielded welding, as well as other gas shielded welding and gas shielded welding, which are generally used for the welding of low-carbon steel and low-alloy, high-strength steel, and various large-scale steel structure projects.

1. The electrodes used are different: tungsten is used as the electrode for argon arc welding, and fine welding wire is used as the electrode for secondary welding.

2. The shielding gas is different: argon arc welding generally uses argon, and carbon dioxide is used as the shielding gas for secondary shielding welding.

3. The scope of use is different: argon arc welding can weld metal substances, such as aluminum-magnesium alloy, etc., but welding these non-ferrous metals can not be welded with two shields.

Precautions for TIG welding.

Rectangular wave AC tungsten argon arc welding can be used to change the proportion of positive and negative half-wave energizing time to unify the DC component and adjust the strength of the cathodic cleaning effect, but the appropriate minimum ratio should be selected according to the welding conditions, so that it can not only meet the needs of cleaning the oxide film, but also obtain the maximum penetration depth and the minimum tungsten loss. Although the proportion is too large, the cathodic cleaning effect can be lighter, but the tungsten electrode will be seriously burned, and the lead roller melt pool will become shallow and wide, which is not conducive to welding.

When the welding current is large, the use of fine-diameter pointed tapered tungsten electrode will make the current density too large, causing the tungsten electrode end to overheat and melt and increase the burning loss. At the same time, the half point of the arc will also extend to the cone surface of the end of the tungsten electrode, which will make the arc column obviously expand and fluctuate unsteadily, which will affect the welding seam forming. Therefore, tungsten electrodes with coarse diameters should be selected for high-current welding, and their ends should be ground into blunt taper angles or flat-top cones to be used.