Welding

Question 1

How much pressure is in an oxygen tank?

Answer 1

About 2200psi when full

Question 2

How much pressure is in an acetylene tank?

Answer 2

About 330psi when full (stabilized by acetone)

Question 3

What is the maximum working pressure of acetylene?

Answer 3

10psi

Question 4

What is a Carburizing flame?

Answer 4

(Reducing) = excess fuel (“soft”)

Question 5

When would you use an Oxidizing flame?

Answer 5

use in a corner if flame keeps going out

Question 6

What is MIG shielding gas made up of?

Answer 6

Argon, helium, and carbon dioxide

Question 7

What are some characteristics of a 6010 electrode?

Answer 7

DC excellent penetration, electron flow in all directions

Question 8

In gas welding how can the weld pool be cooled?

Answer 8

adding more filler material or moving the torch away

Question 9

How can you get the necessary amperage from the rod thickness in STICK welding?

Answer 9

Convert fractional dimension to thousands of an inch & multiply by 1000

Question 10

What should shielding gas be set to when MIG welding?

Answer 10

Turn on shielding gas 20 to 30 Cubic Feet per Hour (CFH)

Question 11

What are some characteristics of a 7014 electrode?

Answer 11

iron powder assists in starting arc. AC or DC
Reverse Polarity. Easy to use and versatile.

Question 12

What are some characteristics of a 7018 electrode?

Answer 12

Has a very thick flux

Question 13

What should the length of your arc be?

Answer 13

about the rod diameter

Question 14

What is arc blow and how do you prevent it?

Answer 14

Occurs when the arc stream does not follow the shortest path between the electrode and the workpiece and is deflected
Arc blow = too much gap
Get closer to the work piece

Question 15

What can happen if a tip becomes clogged when MIG welding and how do you clean it?

Answer 15

– causes wire to snarl at feed
mechanism
* Take to belt sander and remove steel deposit. Clean with tip cleaner

Question 16

What does tungsten Inert Gas use?

Answer 16

a non-consumable electrode
(tungsten) which withstands a very high heat (just don’t dip it in the weld pool!)

Question 17

What inert gas is usually used when TIG welding?

Answer 17

usually Argon (heavier than Helium, lower
consumption)

Question 18

What amperage is used for TIG?

Answer 18

5 to 450 Amps

Question 19

What are some characteristics of a RED tungsten electrode?

Answer 19

2% thoriated. Use for DC (Steel, Stainless)

Question 20

What are some characteristics of an ORANGE tungsten electrode?

Answer 20

Ceriated. Use for general purpose

Question 21

What are some characteristics of a GREEN tungsten electrode?

Answer 21

Pure. Use for AC (Aluminum)

Question 22

How far out should you stick your tungsten electrode?

Answer 22

Stick tungsten out approximately 2X diameter (or stick
into a corner)

Question 23

How is heat controlled in TIG?

Answer 23

Heat controlled by foot pedal. Increase in arc distance increases heat.

Question 24

Should you use AC or DC for TIG welding Aluminum?

Answer 24

Use AC for aluminum

Question 25

At what temperature does aluminum melt?

Answer 25

Aluminum melts around 700°C, but the oxide doesn’t break down until 2000°C.

Question 26

Pieces to be welded must be _______, especially aluminum!

Answer 26

CLEAN