| Answer | Crossword Clue |
|---|---|
| ARGON | Gas used in arc welding |
| ACETYLENE | Gas used in welding |
| ACETYLENE | Gas used in welding. |
| acetylene | gas used in welding, etc. |
| ARGON | Inert gas used in welding |
| ETHYNE | Flammable gas used in welding |
| acetylenes | A colorless pungent-smelling hydrocarbon gas, which burns with a bright flame, used in welding and formerly in lighting |
| XENON | Gas used in arc lamps |
