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Match the welding process in Group 1 with the source of heat in Group 2.
Match the welding process in Group 1 with the source of heat in Group 2.
| Group 1 | Group 2 |
| P. Ultrasonic welding | 1. Thermochemical |
| Q. Spot welding | 2. Electrical resistance |
| R. SMAW | 3. Friction |
| S. Thermit welding | 4. Electric arc |
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