1. Welding joints

2. T joint oxy acetylene

3. Lap joint oxy acetylene

4. Butt joint oxy acetylene

5. T joint arc welding

6. Lap joint arc welding

7. Butt joint arc welding

8. T joint mig

9. Lap joint mig

10. butt joint mig

11. The differences in the three welds
Well the oxy acetylene and arc welding are much harder to master then mig. Mig is also cleaner and easier to master making it more suitable for more inexperienced people.

12. advantages
Mig is easier and a cleaner weld but learning to weld with oxy acetylene or arc welding makes you a more skilled welder and can make you a extremely good mig welder and possibly a better tig welder.