Wait until the temperature rises, and then implement short arc welding. The molten hole in the molten pool should be clearly seen, and it is not allowed to rush forward blindly. Stop the arc when the temperature is high, and continue welding when the temperature is low. The arc is deep above and shallow below, and the position below changes from time to time. The covered electrode angle varies with the weld position. Covered electrode should be replaced quickly, with even joints and slow transition. In order to prevent the root from sinking, covered electrode is sent to the edge of the root. Pay attention to the hole left by the gland, and the angle of the arc depression will change. Hearing the breakdown sound of pop-pop, the penetration is good and the heart is relaxed. Welding is a high-tech skill, which needs more practice to learn and think. Appreciate the mystery, the small weld is wide.
Extended data:
Electric welding refers to a welding method that uses electric energy, heating or pressure, or both, with or without filler to realize atomic bonding of weldments. The processing equipment used for electric welding is called electric welding machine.
Its working principle is: through the commonly used voltage of 220V or 380V, through the transformer in the electric welding machine, the voltage is reduced and the current is enhanced, and the electric energy generates huge arc heat to melt covered electrode and steel, while covered electrode melting makes the fusion between steels higher.
Arc welding is the most widely used welding method, including manual arc welding, submerged arc welding, tungsten gas shielded welding, plasma arc welding, metal gas shielded welding and so on. Because arc welding uses power supply, the high-temperature arc generated by it is easy to cause fire and explosion, which is more dangerous. ?
Electric welding is an economical, applicable and technologically advanced method in material joining processing.
Welding can weld almost any two kinds of metal materials, as well as some metal materials and non-metal materials; The combination of small and large can make a large, economical and reasonable structure; Different parts of the structure can use materials with different properties to give full play to the characteristics of various materials; Welded parts have the characteristics of good air tightness and light weight; Welding can also realize the welding between ultra-thin and ultra-fine materials.
According to the different heating and pressure conditions during welding, welding methods are usually divided into fusion welding, pressure welding and brazing.
Fusion welding is a method of heating the metal at the weld of the weldment to a molten state during welding, and generally completing the welding without pressure. When welding, the heat source makes the metal at the weld of the weldment and the filler metal added when necessary melt rapidly to form a molten pool, which extends with the movement of the heat source and forms a weld after cooling.
According to different electric heating methods, fusion welding using electric energy can be divided into arc welding, electroslag welding, electron beam welding and laser welding. Fusion welding is widely used in various welding methods, especially arc welding.
Pressure welding is a welding method to connect the seams of weldments under pressure (with or without heating). In the process of pressure welding, generally no metal is added. According to the different welding mechanism, pressure welding can be divided into resistance welding, high frequency welding, diffusion welding, friction welding and ultrasonic welding. Among them, resistance welding is the most widely used.
Most pressure welding methods have no melting process, and there are no problems such as the burning of beneficial alloy elements and the immersion of harmful elements in the weld seam. However, the welding conditions of pressure welding are harsh and the scope of application is narrow.
Brazing is a welding method in which materials (solder) with lower melting point than weldments are melted, then the weldments are bonded, and then the seams of weldments are connected together after cooling.
References:
Baidu encyclopedia-electric welding