GMAW

Question 1

In GMAW what dictates positions you can weld?

Answer 1

The transfer being used

Question 2

In “ER70S-6” what does the 6 tell us?

Answer 2

Alloy designation - will not take chem comp because it’s a solid rod

Question 3

In “ER70S-6” what does the \R tell us?

Answer 3

Rod

Question 4

In “ER70S-6” what does the S tell us?

Answer 4

Solid

Question 5

In “ER70S-6” what is the tensile strength?

Answer 5

70,000 psi

Question 6

What does GMAW stand for?

Answer 6

Gas metal arc weld

Question 7

Can you weld overhead in spray transfer?

Answer 7

No - Pulse and Short weld in all positions, Spray only flat and horizontal

Question 8

What percentage of argon do we use for spray and pulse?

Answer 8

90%

Question 9

What controls penetration in GMAW?

Answer 9

Wire feed speed - more contact with plate.

Question 10

What polarity is used for GMAW - S?

Answer 10

DC+ / Reverse Polarity - they all use this

Question 11

What powersource is used for MIG welding?

Answer 11

Constant Voltage - They all use constant voltage

Question 12

What does voltage control in GMAW?

Answer 12

Arc size - lower the voltage the smaller the arc, both width and height of arc grow with voltage

Question 13

What are the four transfers for GMAW?

Answer 13

Spray, Short Circuit, Pulse and Globular

Question 14

What 2 types of gas can be used for GMAW-S?

Answer 14

75/25 and 100% CO2

Question 15

What does CFH stand for?

Answer 15

Cubic Feet Hour

Question 16

Which uses a push travel angle and which use the Drag travel angle?

Answer 16

GMAW-S (Short Circuit uses push) GMAW (SPRAY) and GMAW-P(PULSE) use a Drag travel angle

Question 17

What are the abbreviations for the GMAW types?

Answer 17

GMAW - Gas Metal Arc Welding - Spray
GMAW - S - Gas Metal Arc Welding - Short Circuit
GMAW - P - Gas Metal Arc Welding - Pulse

Question 18

What drive rolls?

Answer 18

Smooth

Question 19

Which has the most penetration and deposition?

Answer 19

Spray

Question 20

Which requires an inverter?

Answer 20

Pulse

Question 21

Which is good for light duty fabrication and gets the least amount of penetration?

Answer 21

Short Circuit

Question 22

What is the electrode they all use?

Answer 22

ER70S-6 Lincoln calls it Super Arc L56 Wire

Question 23

What gas does Spray and Pulse use?

Answer 23

90/10 where 90 is Argon and 10 is CO2

Question 24

Which transfer uses Trim? What is Trim?

Answer 24

Pulse - Trim is used in place of voltage - it hhas a foreground and background current that reduces the heat put into the part, hot cold/hot cold very fast, can hear but not see like an angry bee

Question 25

What must match the size of your electrode?

Answer 25

If you’re using 0.045 wire, than contact tip, drive rolls and wire must match.