?Explain the modulated current metal transfer process.

Question

What will be an ideal response?

Answer 1

In the modulated current process a sensor is attached near the weld on the plate or pipe.  This sensor provides the computer with the necessary information for it to control the metal transfer. 
During the welding the computer senses several steps including:When the droplet of molten metal is almost ready to separate from the filler wire and instantly reduces the welding current, as shown by the sharp drop in current between Figure 10-10 C and 10-10 D. Once the arc has been reestablished, the computer increases the current back to the higher level for a softer restarting of the arc. The higher current level of the reestablished arc allows it to melt back the filler metal to form a molten ball of metal on the end. After the molten ball is created, the current level is reduced so the end of the wire and molten ball are pushed downward into the molten weld pool.