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match welding process and heat source

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Welding process                  Heat Source

A. Themit welding                 1. Chemical reaction

B. Seam welding                  2. Exothermic chemical reaction

C. MIG welding                    3. Electric spark

D. Friction welding               4. Ohmic resistance

                                            5. Mechanical work

                                            6. Electric arc

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processes that uses heat from external source
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