3: Heat Joining

Question 1

Oxy-Acetylene Welding - Process (3)

Answer 1

1. Flame comes into contact with filler rod
2. Melts surface forming a molten pool
3. edges of filler rod melts and runs together to complete the weld

Question 2

Metal Inert Gas (MIG) Welding - Process (3)

Answer 2

1. heat source continually moves along joint & melts area (weld pool)
2. a shielding gas flows over the arc and joint to separate it from the atmosphere
3. as the heat source moves on, area behind quickly cools it and solidifies

Question 3

Brazing - Process (5)

Answer 3

1. surface is cleaned
2. flux is applied to prevent oxidation of the surface
3. joint is heated
4. filler wire melts and flows into joint
5. part is cooled and hardens

Question 4

Soft Soldering - Process (4)

Answer 4

1. heat part
2. add solder
3. continue heating
4. cool