Welding - GMAW (Gas Metal Arc
Welding)
*True or False:* A concave root surface is caused by the wire being too far back in the
puddle. - ✔️✔️*True:* A concave root surface is caused by the wire being too far back
in the puddle.
The Electrode should be placed at what point in the puddle, *Front/Back/side*? -
✔️✔️The Electrode should be placed at *front* point in the puddle
Name some types of ferrous metal - ✔️✔️*Ferrous Metal Types*
- *Mild Steel* - Carbon content of 0.1 to 0.3% and Iron content of 99.7 - 99.9%. Used for
engineering purposes and in general, none specialized metal products.
- *Carbon steel* - Carbon content of 0.6 to 1.4% and Iron content of 98.6 to 99.4 %.
Used to make cutting tools such as drill bits.
*Stainless Steel* - Made up of Iron, nickel and chromium. Resists staining and corrosive
and is therefore used for the likes of cutlery and surgical instrumentation.
*Cast Iron* - carbon 2 - 6% and Iron at 94 to 98%. Very strong but brittle. Used to
manufacture items such as engine blocks and manhole covers.
*Wrong Iron* - Composed of almost 100% iron. Used to make items such as ornamental
gates and fencing. Has fallen out of use somewhat.
What will happen when your voltage is set excessively low and your wire is set
excessively high? - ✔️✔️Spatter
When wire feed is increased current will *increase/decrease*? - ✔️✔️When wire feed is
increased current will *increase*
What will happen to a butt weld if the opening is too wide and the travel speed is to
slow? - ✔️✔️Too much build up of material
The power source for GMAW welding is constant *current/voltage*? - ✔️✔️The power
source for GMAW welding is constant *voltage*
GMAW is applied *automatically/semi automatically*? - ✔️✔️GMAW is applied *semi
automatically*
What is the primary problem of having excessive stickout? - ✔️✔️*Increased wire
speed* is the primary problem of having excessive stickout
Wire feed controls *amperage/voltage*? - ✔️✔️Wire feed controls *amperage*
, How many beads should a horizontal square groove butt joint should have? - ✔️✔️A
horizontal square groove butt joint should have *1 bead*
The shielding gas we use for GMAW is _____% _________________ gas and ____%
____________ gas. - ✔️✔️The shielding gas we use for GMAW is *75% argon* gas
and *25% carbon dioxide* gas.
*True or False:* To correct for excessive convexity you should reduce current and
increase voltage. - ✔️✔️*True:* To correct for excessive convexity you should reduce
current and increase voltage.
*True or False:* Unequal legs on a weld are caused by an incorrect work angle. -
✔️✔️*True:* Unequal legs on a weld are caused by an incorrect work angle.
Current *increases/decreases* when the electrode stickout is increased? -
✔️✔️Current *decreases* when the electrode stickout is increased
The three angles for a horizontal T joint are- ________ degrees, ________ degrees,
and _______degrees - ✔️✔️The three angles for a horizontal T joint are - *45*
degrees, *55* degrees, and *35* degrees
Lack of shielding gas causes surface ___________ in a weld. - ✔️✔️Lack of shielding
gas causes surface *porsity* in a weld.
The _________ ___________ is the fitting on the gun that the wire is fed through. -
✔️✔️The *contact tube* is the fitting on the gun that the wire is fed through.
What will cause gas lines to frost when wire welding? - ✔️✔️*Too high of gas pressuer*
will cause gas lines to frost when wire welding?
A generic universal term encompassing many application processes - ✔️✔️Wire
Welding
A type of welding that must use only noble gasses (argon is the most common)
- Helium
- Neon
- Argon
- Krypton
- Xenon
- Radon - ✔️✔️Metal Inert Gas (MIG) Welding
Welding)
*True or False:* A concave root surface is caused by the wire being too far back in the
puddle. - ✔️✔️*True:* A concave root surface is caused by the wire being too far back
in the puddle.
The Electrode should be placed at what point in the puddle, *Front/Back/side*? -
✔️✔️The Electrode should be placed at *front* point in the puddle
Name some types of ferrous metal - ✔️✔️*Ferrous Metal Types*
- *Mild Steel* - Carbon content of 0.1 to 0.3% and Iron content of 99.7 - 99.9%. Used for
engineering purposes and in general, none specialized metal products.
- *Carbon steel* - Carbon content of 0.6 to 1.4% and Iron content of 98.6 to 99.4 %.
Used to make cutting tools such as drill bits.
*Stainless Steel* - Made up of Iron, nickel and chromium. Resists staining and corrosive
and is therefore used for the likes of cutlery and surgical instrumentation.
*Cast Iron* - carbon 2 - 6% and Iron at 94 to 98%. Very strong but brittle. Used to
manufacture items such as engine blocks and manhole covers.
*Wrong Iron* - Composed of almost 100% iron. Used to make items such as ornamental
gates and fencing. Has fallen out of use somewhat.
What will happen when your voltage is set excessively low and your wire is set
excessively high? - ✔️✔️Spatter
When wire feed is increased current will *increase/decrease*? - ✔️✔️When wire feed is
increased current will *increase*
What will happen to a butt weld if the opening is too wide and the travel speed is to
slow? - ✔️✔️Too much build up of material
The power source for GMAW welding is constant *current/voltage*? - ✔️✔️The power
source for GMAW welding is constant *voltage*
GMAW is applied *automatically/semi automatically*? - ✔️✔️GMAW is applied *semi
automatically*
What is the primary problem of having excessive stickout? - ✔️✔️*Increased wire
speed* is the primary problem of having excessive stickout
Wire feed controls *amperage/voltage*? - ✔️✔️Wire feed controls *amperage*
, How many beads should a horizontal square groove butt joint should have? - ✔️✔️A
horizontal square groove butt joint should have *1 bead*
The shielding gas we use for GMAW is _____% _________________ gas and ____%
____________ gas. - ✔️✔️The shielding gas we use for GMAW is *75% argon* gas
and *25% carbon dioxide* gas.
*True or False:* To correct for excessive convexity you should reduce current and
increase voltage. - ✔️✔️*True:* To correct for excessive convexity you should reduce
current and increase voltage.
*True or False:* Unequal legs on a weld are caused by an incorrect work angle. -
✔️✔️*True:* Unequal legs on a weld are caused by an incorrect work angle.
Current *increases/decreases* when the electrode stickout is increased? -
✔️✔️Current *decreases* when the electrode stickout is increased
The three angles for a horizontal T joint are- ________ degrees, ________ degrees,
and _______degrees - ✔️✔️The three angles for a horizontal T joint are - *45*
degrees, *55* degrees, and *35* degrees
Lack of shielding gas causes surface ___________ in a weld. - ✔️✔️Lack of shielding
gas causes surface *porsity* in a weld.
The _________ ___________ is the fitting on the gun that the wire is fed through. -
✔️✔️The *contact tube* is the fitting on the gun that the wire is fed through.
What will cause gas lines to frost when wire welding? - ✔️✔️*Too high of gas pressuer*
will cause gas lines to frost when wire welding?
A generic universal term encompassing many application processes - ✔️✔️Wire
Welding
A type of welding that must use only noble gasses (argon is the most common)
- Helium
- Neon
- Argon
- Krypton
- Xenon
- Radon - ✔️✔️Metal Inert Gas (MIG) Welding
