"How is the principle of regelation applicable for welding?" Explain.

Explanation

### Step-by-Step Solution:

1. **Understanding Regelation**:
- Regelation is a phenomenon that occurs when a substance melts under pressure and then solidifies upon the reduction of that pressure. This principle is particularly relevant in the context of welding.

2. **Application of Heat and Pressure**:
- In welding, heat is applied to the metals being joined. This heat causes the metal to reach its melting point. When sufficient heat is applied, the metal begins to melt.

...