1. Types of Gases WELDING Copyright © Texas Education Agency, 2012. All rights reserved.

2. 2 Oxygen Colorless Colorless Odorless Odorless Tasteless Tasteless Accelerates combustion Accelerates combustion In liquid state, extremely cold In liquid state, extremely cold (-279 degrees below 0) (-279 degrees below 0) Copyright © Texas Education Agency, 2012. All rights reserved.

3. 3 Oxygen Don’t use oil or grease on equipment or fittings Don’t use oil or grease on equipment or fittings In liquid state, avoid contact with skin due to extreme cold In liquid state, avoid contact with skin due to extreme cold Do not store cylinder near Acetylene cylinder Do not store cylinder near Acetylene cylinder Copyright © Texas Education Agency, 2012. All rights reserved.

4. 4 Acetylene Colorless Colorless Garlic-like odor Garlic-like odor When combined with oxygen, burns at temperatures up to 6300 degrees When combined with oxygen, burns at temperatures up to 6300 degrees Copyright © Texas Education Agency, 2012. All rights reserved.

5. 5 Acetylene Mixed with Oxygen or air in a confined area will explode if brought into contact with a heat source or flame (store in well-ventilated area) Mixed with Oxygen or air in a confined area will explode if brought into contact with a heat source or flame (store in well-ventilated area) Never use in excess of 15 psi (after that it becomes unstable) Never use in excess of 15 psi (after that it becomes unstable) Never store cylinder in horizontal position Never store cylinder in horizontal position Copyright © Texas Education Agency, 2012. All rights reserved.

6. 6 Argon Colorless Colorless Tasteless Tasteless Odorless Odorless Nonflammable Nonflammable Inert Inert Cleaning gas when used to weld Aluminum Cleaning gas when used to weld Aluminum Smooth arc action during welding Smooth arc action during welding Copyright © Texas Education Agency, 2012. All rights reserved.

7. 7 Argon Store in well-ventilated area because it will displace Oxygen in the air Store in well-ventilated area because it will displace Oxygen in the air Copyright © Texas Education Agency, 2012. All rights reserved.

8. 8 Carbon Dioxide Colorless Colorless Tasteless Tasteless Odorless Odorless Very cold Very cold Used as a shielding gas in a variety of welding operations Used as a shielding gas in a variety of welding operations Copyright © Texas Education Agency, 2012. All rights reserved.

9. 9 Carbon Dioxide May cause severe frostbite to the skin May cause severe frostbite to the skin Can displace the life-giving atmosphere therefore causing suffocation (store in a well-ventilated area) Can displace the life-giving atmosphere therefore causing suffocation (store in a well-ventilated area) Copyright © Texas Education Agency, 2012. All rights reserved.

10. 10 Nitrogen Colorless Colorless Tasteless Tasteless Odorless Odorless Extremely cold Extremely cold Copyright © Texas Education Agency, 2012. All rights reserved.

11. 11 Nitrogen Can cause severe frostbite to the skin Can cause severe frostbite to the skin Copyright © Texas Education Agency, 2012. All rights reserved.

12. 12 Helium Tasteless Tasteless Colorless Colorless Odorless Odorless Inert gas used for shielding Inert gas used for shielding Copyright © Texas Education Agency, 2012. All rights reserved.

13. 13 Helium Store in well-ventilated area Store in well-ventilated area Copyright © Texas Education Agency, 2012. All rights reserved.

14. 14 Propane Colorless Colorless Present in Petroleum & Natural Gas Present in Petroleum & Natural Gas When combined with Oxygen, burns at temperatures up to 5190 degrees When combined with Oxygen, burns at temperatures up to 5190 degrees Copyright © Texas Education Agency, 2012. All rights reserved.

15. Store in well-ventilated area Store in well-ventilated area 15 Propane Copyright © Texas Education Agency, 2012. All rights reserved.

16. 16 Mapp (Methylacetylene & Propadiene) Colorless Colorless Strong garlic smell Strong garlic smell Acetylene product that is liquified & stabilized so that it can be used at 375 psi at 170 degrees Acetylene product that is liquified & stabilized so that it can be used at 375 psi at 170 degrees When combined with Oxygen, burns at temperatures up to 5301 degrees When combined with Oxygen, burns at temperatures up to 5301 degrees Copyright © Texas Education Agency, 2012. All rights reserved.

17. 17 Mapp Store in a well-ventilated area Store in a well-ventilated area Copyright © Texas Education Agency, 2012. All rights reserved.

18. 18 Natural Gas Colorless Colorless Tasteless Tasteless Odorless Odorless Gaseous hydrocarbon which has been distilled Gaseous hydrocarbon which has been distilled When combined with Oxygen, burns at temperatures up to 5000 degrees When combined with Oxygen, burns at temperatures up to 5000 degrees Copyright © Texas Education Agency, 2012. All rights reserved.

19. 19 Natural Gas Store in a well-ventilated area Store in a well-ventilated area Copyright © Texas Education Agency, 2012. All rights reserved.