GMAW Unit 1 and 2

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