How to distinguish molten iron and iron slag during manual electric welding? What are the welding methods?

How to distinguish molten iron and iron slag during manual electric welding? What are the welding methods?

How to distinguish between molten iron and slag:
The bright and clear white is molten iron.
It is molten slag that is black and turbid.

The welding method is based on the heating and pressure conditions during welding. Generally, welding can be divided into three categories, welding, pressure welding and brazing.
Fusion welding: During the welding process, the metal at the joint of the weldment is heated to a molten state. Generally, the welding can be completed without pressure. During fusion welding, the heat source quickly melts the metal at the weld joint and the filler metal added when necessary to form a molten pool. The molten pool extends with the movement of the heat source and forms a weld after cooling. According to different electric heating methods, it is divided into electroslag welding, arc welding, electron beam welding and laser welding. At present, fusion welding has a wide range of applications, and it is most commonly used in various welding methods, especially arc welding.

Pressure welding: A welding method that connects the weldment joints under pressure (whether heated or not). No filler metal is usually added during the pressure welding process. Pressure welding can be divided into high frequency welding, resistance welding, friction welding, diffusion welding, ultrasonic welding, etc. according to the different welding mechanism. At present, resistance welding is the most widely used.

Brazing: Use a material with a melting point lower than that of the weldment to adhere the weldment. It is a welding method that connects the weldment joints after cooling.

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