The covered electrode is a uniform and centripetal coating of the coating (coating) on ​​the core outside the metal core. The core of the welding rod is the metal core of the welding rod. In order to ensure the quality and performance of the welding seam, the content of each metal element in the welding core is strictly regulated, especially for the content of harmful impurities (such as sulfur, phosphorus, etc.). The limit is better than the base metal. The electrode consists of two parts: the core and the coating. The types are different and the cores are different. The composition of the core directly affects the composition and properties of the weld metal, so the harmful elements in the core should be as small as possible.
Welded carbon steel and low alloy steel cores are generally selected from low carbon steel as the core and added with manganese, silicon, chromium, nickel and other components (see National Standard GB1300-77 for details). The reason for using low carbon is that the steel wire has good plasticity when the carbon content is low, and the wire drawing is relatively easy. On the other hand, the CO content of the reducing gas can be reduced, the splash or pores can be reduced, and the temperature at which the weld metal is solidified can be increased. It is good for overhead welding. The addition of other alloying elements is mainly to ensure the comprehensive mechanical properties of the weld, and also has a certain effect on the welding process performance and the removal of impurities.
High-alloy steel and other metal materials such as aluminum, copper, cast iron, etc., in addition to the requirements of the metal core of the weld metal, also control the content of impurities, and often add certain alloying elements according to the process requirements.
The welding rod is a molten electrode for coating electrode arc welding, which is composed of two parts: a coating and a welding core. The chamfer at the front end of the electrode has a chamfer of about 45°, which is for the purpose of arc ignition. There is a section of bare core at the end, which accounts for about 1/16 of the total length of the electrode, which facilitates the clamping of the welding tongs and facilitates electrical conduction. The diameter of the electrode actually refers to the diameter of the core. It is usually 2, 2.5, 3.2 or 3, 4, 5 or 6 mm. The most commonly used are small 3.2, small 4 and small 5, and the length is "L". "Generally between 200 and 550 mm.
Claim
(1) It is easy to lead the arc to ensure the stability of the arc and the splash is small during the welding process.
(2) The melting speed of the coating should be slower than the melting speed of the core to form a flared sleeve (the length of the sleeve should be smaller than the diameter of the core), which is conducive to the droplet transfer and the protective atmosphere;
(3) The specific gravity of the slag should be less than the specific gravity of the molten metal, and the solidification temperature should also be slightly lower than the solidification temperature of the metal, and the slag shell should be easily removed;
(4) having alloying and metallurgical treatment;
(5) Adapt to welding at various locations.
classification
According to different situations, there are three classification methods for welding electrodes: classification according to the purpose of welding rods, classification according to the main chemical components of the coatings, and classification according to the characteristics of the molten slag after melting of the coatings.
According to the use of the welding rod, there are two forms of expression. One is compiled by the former Ministry of Machinery Industry. The welding electrode can be divided into: structural steel welding rod, heat-resistant steel welding rod, stainless steel welding rod, surfacing welding rod, low-temperature steel welding rod, cast iron welding rod. , nickel and nickel alloy electrodes, copper and copper alloy electrodes, aluminum and aluminum alloy electrodes and special purpose electrodes. The second is the national standard, which is carbon steel electrode, low alloy electrode, stainless steel electrode, surfacing electrode, cast iron electrode, copper and copper alloy electrode, aluminum and aluminum alloy electrode. There is no principle difference between the two. The former is indicated by a commercial grade and the latter by a model.
If classified according to the main chemical composition of the electrode strip, the electrode can be divided into: titanium oxide electrode, titanium oxide calcium electrode, ilmenite electrode, iron oxide electrode, cellulose electrode, low hydrogen electrode , graphite type electrode and salt-based electrode.
If the characteristics of the slag are classified according to the characteristics of the slag after melting, the electrode can be divided into an acid electrode and a basic electrode. The main component of the acid electrode coating is an acidic oxide such as silica, titania, or ferric oxide. The main component of the alkaline electrode coating is an alkaline oxide such as marble or fluorite.
There are many classification methods for welding electrodes, and the welding electrodes can be classified according to the application, the alkalinity of the slag, the main components of the electrode coating, and the performance characteristics of the welding rod. Classified by purpose
China's current welding rod classification method is mainly based on the national standard of welding rods and the "welding material samples" compiled by the former Ministry of Machinery Industry. The welding rod models are divided into 8 categories according to national standards, and the welding rod grades are divided into 10 categories according to their purposes.
Gear Reducer Motor is a small precision reducer, and the size and specification can be customized below 38mm. Shenzhen shun cheong electrical co., LTD. 15 years engaged in the design, development, manufacture Dc Gear Motor, products applicable to the smart home, widely used in intelligent robot voice interaction, children's education escort robot, intelligent sweeping machine robot, intelligent robot adaptability, independent motor, intelligent medical robot project.
Application field:
Method of use: the best stable in horizontal plane, installed on the gear reducer motor output shaft parts, cannot use a hammer to knock,knock prone to press into the gear reducer motor drive, may cause damage to internal components, and cannot be used in the case of blocked.
Operating temperature range:
Gear reducer motor should be used at a temperature of -10~60℃.
The figures stated in the catalog specifications are based on use at ordinary room temperature catalog specifications re based on use at ordinary room temperature (approximately20~25℃.
If a geared motor is used outside the prescribed temperature range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.Depending on the temperature conditions ,it may be possible to deal with them by changing the grease of the motor's parts.Please feel free to consult with us about this.
Storage temperature range:
Gear reducer motor should be stored ta a temperature of -15~65℃.
In case of storage outside this range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.
Service life:
The longevity of gear reducer motor is greatly affected by the load conditions , the mode of operation,the environment of use ,etc.Therefore,it is necessary to check the conditions under which the product will actually be used .The following conditions will have a negative effect on longevity.Please consult with us should any of them apply.
â—Use with a load that exceeds the rated torque
â—Frequent starting
â—Momentary reversals of turning direction
â—Impact loads
â—Long-term continuous operation
â—Forced turning using the output shaft
â—Use in which the permitted overhang load or the permitted thrust load is exceeded
â—A pulse drive ,e.g.,a short break,counter electromotive force,PWM control
â—Use of a voltage that is nonstandard as regards the rated voltage
â—Use outside the prescribed temperature or relative-humidity range,or in a special environment.
â—Please consult with us about these or any other conditions of use that may apply,so that we can be sure that you select the most appropriate model.
when it come to volume production,we're a major player as well .each month,we rurn out 600000 units,all of which are compliant with the rohs directive.Have any questions or special needed, please contact us, we have the engineer group and best sales department to service to you Looking forward to your inquiry. Welcome to our factory.
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