| 1 | A working car with gas welding equipments. | |
| 2 | Good mechanical properties and crack resistance. Gas welding and argon arc welding of red copper. | |
| 3 | Gas welding and argon arc welding of aluminum alloys other than high magnesium alloys. | |
| 4 | Welding and cutting in 1949, Beijing has geo-drilling, electric welding and cutting etc oxyacetylene flame manual operation. | |
| 5 | Welding and geo-drilling must be strictly implemented operation system, due to special guard over homework. |