1. Gas Welding

2. Brazing
-Adhesion: filler metal is melted at a lower melting temp onto the base metal Sticks the metal together.

3. Welding
-Base metal is melted along the weld and filler rod is added- melted metal flows together and becomes solid. FUSION!

4. Safety Equipment
-Safety glasses, welding visor: # 3-4 lens, gloves, long sleeves.

5. Welding Equipment
-Torch- tips- hoses- tanks- regulators- tip cleaner- striker

6. Pressures for welding
-oxygen: 10 psi -Acetylene: 5 psi

7. Advantages for Gas Welding
-Stronger than brazing -Able to weld thin metal -Not as much sparks/spatter -Do not need electricity

8. Disadvantages of Gas welding
-Harder to do than Arc welding (Add rod with other hand) -Not as strong as Arc weld -Can be dangerous

9. Oxygen Acetylene Equipment
Oxygen = Green
Acetylene = Red

10. Neutral Flame Neutral Flame
Used in brazing and OAW (oxygen acetylene welding)
Equal amounts of oxygen and acetylene

11. Oxygen Tank
Holds Oxygen
Green
Full tank = 2200 psi

12. Acetylene Tank
Holds Acetylene
Red or Blue
Full tank = 250 psi

13. Tank Valves Open and close tanks Open oxygen tank all the way
Open acetylene tank no more than 1 turn

14. Regulators Attached to tank valve
Used to deliver low pressure to torch
2 gauges: tank pressure / line pressure

15. Hoses Attached to regulators Red = Acetylene Green = Oxygen
Deliver gases to torch

16. Torch
Attached to hoses Mixes the gases Provides a handle to hold the torch and control the flame

17. Torch Valves
Used to adjust the flame
Righty tighty / Lefty loosy

18. Torch Tip Various sizes 00 – 5 Higher the number, bigger/hotter flame
We will use 0 or 1

19. Safety Equipment
-Gloves -Face shield # 3 lens -Leather jacket -Leather apron

20. Striker
-used to light the torch -Never use a match -Never use a lighter (unless you want to blow your hand off…) -Never light off of another torch

21. Lighting and adjusting a torch
1-Open Acetylene valve a crack - ¼ turn 2-Use striker to ignite 3-Open Acetylene valve till the end of the flame starts to dance 4-Open oxygen valve until feather turns into a small cone

22. Shutting Down
1-Righty-tighty 2-Close oxygen valve first 3-then close acetylene

23. Backfire
-Flame goes out with a loud pop -Caused by flame going out suddenly -Causes of Backfire -Tip too dirty (Obstruction in the welding tip) -Torch touches the work piece -Adjustment of flame is set too low or incorrect -Dirty metal -Damaged or loose tip -Tip is overheated

24. Flashback
-Flame burns back inside the tip, the torch and the hose -Causes of Flashback -Backfire -Procedure to Follow -Turn off torch valves -Clean tip