Two plates, each of $6$ mm thickness, are to be butt-welded. Consider the following processes and select the correct sequence in increasing order of size of the heat affected zone.
- Arc welding
- MIG welding
- Laser beam welding
- Submerged arc welding
- $1-4-2-3$
- $3-4-2-1$
- $4-3-2-1$
- $3-2-4-1$