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WorksheetsGMAW Unit 1 and 2
Total questions: 15
Worksheet time: 15mins
When setting up a welding machine for fabricating a metal structure, what polarity do we use for GMAW?
DCEP /DC+
DCEN/DC-
AC
All of the above
The loss of shielding gas can cause this discontinuity in your weld
Lack of fusion
undercut
porosity
coldlap
GMAW can be used to weld what materials?
Mild Steels
Stainless Steels
Aluminum
All of the above
We use a CV machine with the GMAW welding process to keep which variable constant?
Stick out
Arc Length
Shielding Gas
None of the above
The GMAW process was first developed to weld______
Stainless Steel
Steel
Aluminum
Inconel
The earliest mode transfer for GMAW was:
Short-Circuit
Spray Transfer
Globular Transfer
STT
The thickness range of the base metal to be welded will dictate what?
The electrode diameter
The Weld Profile
The CTWD
None of the above
In the late 1950s, improvements in power source technology and the use of smaller wire sizes (035 in. -
062 in.) led to a new mode of metal transfer, which came to be known as:
Short Circuit Transfer
Globular Transfer
Spray Transfer Pulsed
STT
Spray Transfer
The shielding gas selection will influence the selection of:
Mode of metal transfer
Wire Type
Wire Diameter
Usable current range
Which of the following is limited by electrode size?
Amperage
Voltage
CTWD
Travel speed
Which of the following is directly correlated to amperage?
Voltage
CTWD
Travel Speed
CFH
None of the above
What is the primary purpose of shielding gas?
To change the type of metal transfer
To protect the molten puddle from the atmosphere
To increase your heat input
To make a cleaner looking weld
If we needed to increase our amperage in GMAW, why would we need to increase our voltage as well?
To carry the extra current we've added
To help stabilize the arc
To increase the WFS
None of the above
To set the correct polarity when welding with the GMAW process:
Install the welding cables on the correct terminals
Use the polarity selector switch on the power source
install the correct drive rolls
None of the above
What is 'Electrode Extension' ?
The distance from the contact tip to the arc
The distance from the contact tip to the work piece
The Arc length minus the contact tip size
none of the above
