What is the difference between acid electrode and alkaline electrode What are the characteristics in

What are acid electrodes and alkaline electrodes in electric welding? And how to tell the difference? Be clear when welding.

What is the difference between acid electrode and alkaline electrode, how to operate and use, look at it completely clear.

What is the difference between acid electrode and alkaline electrode, see what the old welder has to say.

1. Oxidation of coating components of acid electrodes.

Strong; The alkaline electrode coating component is weakly oxidized.

2. The acid electrode is not very sensitive to water and rust pores, and the electrode is baked for 1h at 75 150 before use; The alkaline electrode is more sensitive to water and rust pores, and the electrode is baked for 1 2h after 350 400 before use

3. The arc of acid electrode is stable, and AC or DC welding can be used; Whereas, alkaline electrodes contain fluoride due to the coating contained in them.

To deteriorate the arc stability, DC welding must be used, and only when the arc stabilizer is added to the coating can it be used for both AC and DC.

4. The welding current of acid electrode is large; The welding current of alkaline electrode is smaller, about 10% smaller than that of acid welding of the same specification.

5. Acid electrode should be operated in a long arc; The alkaline electrode should be operated in a short arc, otherwise it is easy to cause porosity.

6. Poor transition effect of acid electrode alloying elements; The alkaline electrode has a good transition effect of alloy elements.

7. The acid electrode weld is well formed and the penetration depth is shallow; The alkaline electrode weld is well formed, easy to stack, and the penetration depth is slightly deeper.

8. The slag structure of acid electrode is glassy; Whereas, the slag structure of alkaline electrodes is crystalline.

9. It is more convenient to remove slag from acid electrode; However, it is more difficult to remove the slag of the first layer in the groove of the alkaline electrode, and it is easier to remove the slag of each layer in the future.

10. The acid electrode weld is often welded and the low temperature impact performance is average; However, alkaline electrode welds often have high impact performance at low temperatures.

11. Acid electrode has poor crack resistance; And alkaline electrodes have good crack resistance.

12. The hydrogen content in the acid electrode weld is high, which is easy to produce "white spots" and affect plasticity; Whereas, alkaline electrode welds have a low hydrogen content in the weld.

13. Less smoke and dust when acid electrode welding; Alkaline electrodes have more smoke and dust when welding.

Hope, thank you.

What are acid electrodes and alkaline electrodes, and what are the characteristics of each?

First, the electrode coating does not contain strong alkaline oxides, and such electrodes are called acid electrodes. Generally, titanium oxide, manganese oxide, silicon dioxide, iron oxide, etc. are mostly used as the main components of the coating. The characteristics of acid electrodes are; 1. Strong oxidation.

2. It is not very sensitive to rust, grease, moisture and other substances. 3. No need to bake before welding. 4. AC and DC dual-purpose.

5. It is not easy to deviate the arc, which is conducive to operation. Second, the electrode coating contains more components of marble, fluorite and other alkaline substances of the electrode, such a electrode is called alkaline electrode. The characteristics of alkaline electrodes are; 1. The coating has sufficient deoxidation effect.

2. Usually the DC reverse connection method is used for welding. 3. The mechanical properties of the weld metal are good, the impact toughness is high, and it is suitable for the welding of important structural steel. 4. It is particularly easy to get damp, and the welding rod should be dried before welding, the drying temperature is between 250 and 400, and the drying time is 2 hours.

5. The mechanical properties of the weld metal of alkaline electrode are significantly higher than those of acid electrode. 6. It is easy to produce the phenomenon of eccentricity, and the short arc welding method should be used as much as possible.

Summary. Alkaline electrodes that contain a large amount of alkaline oxides (CAO, Na2O, etc.) in the coating are called alkaline electrodes. The alkaline electrode has strong desulfurization and dephosphorization ability, and the coating has a dehydrogenation effect.

The weld of alkaline electrode has good crack resistance and mechanical properties, but the process performance is poor, and it is generally welded with DC power supply, which is mainly used for the welding of important structures (such as boilers, pressure vessels and alloy structural steel, etc.).

What is alkaline electrode, what is acidic electrode, and what are the advantages and disadvantages of each.

Alkaline electrodes that contain a large amount of alkaline oxides (CAO, Na2O, etc.) in the coating are called alkaline electrodes. The alkaline electrode has strong desulfurization and dephosphorization ability, and the coating has a dehydrogenation effect. The weld of alkaline electrode has good crack resistance and mechanical properties, but the process performance is poor, and it is generally welded with DC power supply, which is mainly used for the welding of important structures (such as boilers, pressure vessels and alloy structural steel, etc.).

Acid electrodes are electrodes that contain a large amount of acid oxides in the coating. There are 5 types of coatings for acid electrodes: high titanium oxide type, calcium titanium oxide type, ilmenite type, iron oxide type and cellulose type.

Due to the high content of acid oxides (such as SiO2, TiO2, etc.) in the coating, the welding process performance of the electrode is good, such as stable arc, easy slag removal, beautiful forming, little spatter, suitable for AC and DC power supplies. This type of electrode is often used for the welding of decorative parts such as cover welding. The disadvantages of acid electrodes are that the diffused hydrogen content in the weld is high, the crack resistance is poor, and it is not suitable for welding rigid parts and thick plate structures.

In addition, due to its low toughness of the weld, it is not suitable for welding structures that are subjected to dynamic loads or used at low temperatures. With the increase of alkaline oxide in the coating, the weld toughness is improved, so the weld toughness of titanium oxide calcium electrode and ilmenite electrode is higher than that of high titanium oxide electrode, which can be used for welding of more important parts. The cellulose electrode has higher weld toughness and can weld steel for pipelines of various strength levels, especially suitable for downward vertical welding and bottom welding of pipes.

Acid oxides in slag.

When there is more than basic oxide, this electrode is called an acid electrode.

The characteristics of acid electrodes are as follows:

1) Strong oxidation.

2) The impact value of the weld is low.

3) Less alloy elements in the weld. (4) During welding, it is less sensitive to pores caused by rust, water, oil, etc.

5) It is easy to produce thermal cracks.

6) AC power or DC power can be used. When using DC power supply, the positive connection method can be used.

to reduce spatter.

7) The slag is black and shiny.

Commonly used carbon steel acid electrodes include titanium-calcium type E4301, E5001, etc. The main advantages of acid electrode are good manufacturability, easy arc initiation and stable arc, less spatter, good slag removal, weld forming guanguan, and easy to master welding technology. In addition, the acid electrode has good porosity resistance, and the weld metal rarely produces porosity caused by hydrogen, which is not sensitive to rust and oil, and produces less harmful gases during welding.

Acid electrodes can be used with AC and DC welding power sources, which are suitable for welding in various positions, and the drying temperature of the welding source grip bar before welding is low.

The disadvantage of acid electrodes is the mechanical properties of the weld metal.

Poor, especially the plasticity and toughness of the weld metal are lower than that of alkaline electrodes. The deoxidation of acid slag mainly depends on the diffusion method, so the deoxidation leakage is not complete, and it cannot effectively remove impurities such as sulfur and phosphorus in the weld. Another major disadvantage of acid electrode is that the thermal crack resistance is not good, and the sulfur content of the weld metal is high, so the hot cracking tendency is large.

Due to the high hydrogen diffusion content of the weld metal, the resistance to cold cracking is also poor. In addition, the oxidation of the acid electrode coating is strong, which makes the alloying elements burn more. Due to the above shortcomings, acid electrodes are suitable for general mild steel.

The welding of ordinary low-carbon steel structures with low strength grades is generally not used for welding back-cracking and jointing low-alloy steel.

1: When the base metal is in it. c and.

When the content of S, P and other elements is high, the weld is prone to cracks, and low-hydrogen electrodes with good crack resistance should be selected.

2: For the weldments bearing dynamic load and impact load, in addition to meeting the strength requirements, it is also necessary to ensure that the weld has high toughness and plasticity, and low-hydrogen electrodes with high plasticity and toughness indicators should be selected.

3: For weldments with complex structure, large rigidity and large thickness, due to the great stress generated during the welding process, it is easy to cause cracks in the weld, so low-hydrogen electrodes with good crack resistance should be selected.

4: For weldments that are difficult to clean the welding parts, acid electrodes with strong oxidation and insensitivity to rust, oxide scale and oil stains should be selected.

5: In the absence of DC power supply, and the welding structure requires the use of low-hydrogen electrodes, AC and DC dual-purpose low-hydrogen electrodes should be selected.

6: In small or poor ventilation conditions, acid electrodes or low-dust electrodes should be selected.

Improve operational process performance.

Under the condition of meeting the performance requirements of the product, try to choose acid electrodes with stable arc, less spatter, uniform and neat weld forming, and easy slag removal.