Different losses: the heat input of secondary welding is small, that is, the power consumption is less, and the inverter welding machine saves more electricity. Electric welding will consume more electricity.
The efficiency is different: covered electrode does not need baking, covered electrode does not need changing, and welding slag does not need knocking. Welders must do this.
The speed is different: the second welding is three times that of covered electrode.
Extended data:
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
References:
Baidu encyclopedia-secondary welding