Modern society has increased demand for steel. In daily life, many things are made of metal, and many metals cannot be cast at the same time. Therefore, welding is required to be welded. The role of the electrode during the welding process is very important.
The electric welding strip is electrically melted at a high temperature at an arc welding, filled at the seam of the welding workpiece. Typically, the corresponding electrode is selected according to the material of the welding workpiece. The electrodes can be used to weld the welding between the same steel or different steels.
Welding rod structure
The internal metal built-in metal core and an outer coating of the electrode. The core is a steel wire having a certain diameter and length. The main function of the core is that the conductive current makes it heated, and the connecting workpiece is filled.
Welded cores can generally be divided into carbon steel, alloy steel and stainless steel. However, in order to meet the welding requirements, there is a special requirement for the material of the core and the metal element, and the content of some metal elements is strictly regulated. Because the metal composition of the core material directly affects the quality of the weld.
There is a coating outside the electrode, which is called a pharmaceutical skin. Percutaneous effects play an important role. If the welding core is directly welded to the workpiece, the air and the like will enter the molten metal of the dielectric core, and the chemical reaction occurs in the molten metal, which directly causes the weld. Quality problems such as pores, cracks directly affect the welding strength. Coatings containing special elements decompose melt into gas and slag at high temperatures, which can effectively prevent air from entering, improve welding quality.
The ingredients of the pharmaceutical skin include: hydrochloric acid, fluoride, carbonate, oxide, organic matter, ferric alloy and other chemical powders, etc., which are mixed according to a certain formulation ratio. The coating composition of different types of electrode coatings is also different.
The coating of the core surface generally has two thicknesses, and the main components of the coating are substantially the same.
There are three types, namely, slag, gas generating agents, and deoxidizers.
The slag is a compound which protects the molten metal liquid when the electrode is melted, thereby increasing the quality of the welding.
Gas generants are mainly composed of substances such as starch and wood powder, have a certain reduction.
The deoxidizer consists of titanium iron and manganese. Typically, such substances can increase the wear resistance and corrosion resistance of metals.
In addition, there are other types of coatings on the surface of the electrodes, each type of ingredients and proportions will vary.
Welding rod manufacturing process
The manufacturing process of the welding rod is based on the design of the welding rod to make the die and prepare the coating, and the coating is uniformly applied to the welding core, which conforms to the design requirements of the qualified electrode.
First, the rolled steel bars are pulled out from the coiled machine, and the rust of the surface of the steel bar is removed in the machine, and then straightened, and the steel bar is cut into the length of the electrode.
Next, it is necessary to prepare the coating on the surface of the electrode. The various raw materials of the coating were screened to remove the impurities, and then inserted into the machine, and the binder was added. All powdered raw materials are thicker through the stirring of the machine.
The mixed powder is placed in the mold, and the cylindrical cylinder having a circular hole in the middle is pressed.
Put the pressed plurality of bottles into the machine, and place the core into the machine feed port, the solder core into the machine from the machine feed port, the solder core passes through the center of the cartridge due to extrusion. machine. The powder is uniformly applied to the passing core to become a coating.
During the coating process of the electrode, the entire solder core is applied to a layer of coating. In order to make the electrode easy to clamp and conduct electricity, the head and tail of the electrode need to be polished, and the solder core is exposed.
After coating the coating, the grinding head and the grinding electrode will be uniformly arranged on the iron frame, and the oven is dried.
In order to be able to distinguish the specifications of the electrode, it is necessary to print on the electrode. When the electrode moves on the conveyor belt, each electrode is printed by a rubber printing roller on the conveyor belt.
The welding rod print is completed, and the solder rod is checked and sold.
The electrodes can make the weld present a fine beautiful fish scale welding. Without many years of welding experience, the welder is difficult to weld so beautiful weld, then what is the fish scaner so difficult?
Note: What we usually say is actually referred to as TIG welding (non-melted electrode inert gas protection arc welding). Normal electrode arc welding (manual arc welding) can also be welded. Fish scale welding is only aesthetically pleasing and welding quality. It is not necessarily the best. According to the teacher's statement, the truly welding is the smoothness of the weld, and it can't see where the joint is.
As the most widely used welding method in industrial production, the arc welding is convenient, good adaptability, adapting to welding, various positions, and various structures of different steels, can be welded. It is only necessary to connect the positive and negative electrode adhesion of the electric solder to the welding rod and the welding workpiece, the contact between the welding rod, and the welding device can short the circuit. When the circuit is short-circuited, the arc is generated between the weld rod and the solder, and excessive arc is heated to the weld rod and the solder portion. The solder forms a metal liquid.
When the arc moves forward, the molten metal liquid gradually begins to cool to form a weld. Welding requires adequate solder, requires the problem of welding quality, such as leakage, ventilation welding, so excess solder will form a slag, and this welding slag will be cleaned in the solder.
Therefore, the quality of the welder technology directly determines the quality of high and low welding, as well as the beauty of the welding line, although the fish scale welding is not the best, but to weld, it still needs a certain technical accumulation.
