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Match the following:
Match the following:
| Group 1 | Group 2 |
| P. Thermit welding | 1. Globular metal transfer |
| Q. Arc welding | 2. Mechanical energy converted to heat energy |
| R. Welding in solid state | 3. Exothermic process |
| S. Friction welding | 4. Diffusion bonding |
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