Cutting Chapter 4 Flashcards
The CAC process can be used in all positions on any metal that will conduct electricity.
True
Ex CAC process on metals
carbon steel
stainless steel
cast iron
copper and their alloys
How can CAC primarily be used to do what 4 processes?
To gouge weld groves
to back gouge welds
to gouge out defective welds
prepare cracks for welding.
The currents used with CAC-A electrodes are much higher than those required for……
comparably sized shielded metal arc welding electrodes
The connecting cable of the CAC-A torch contains both of what things?
Electrical cable
Compressed air hose
What current welding machines may be used to supple power to CAC-A torches?
AC or DC
DC or AC welding machines preferred?
DC
A CAC-A torch requires what to blow the molten metal from the cut.
regulated compressed air
How should the regulator be set for?
The lowest pressure that will reliably do the job.
During cutting or gouging activites of CAC-A, what tends to happen with the molten metal
Splatter
Because of molten metal splattering, you have to make sure what?
Fire resistant shields or screen are set up to protect personnel and equipment near the work area.
You don’t need to make sure a fire watch is posted.
F
3 basic types of CAC-A electrodes
Plain
Copper-coated for direct current
Copper- coated for alternating current
How are round electrode sizes are specified by what
Diameter
Flat electrodes are specified by the what?
Width of their widest side.
CAC-A work generates what 3 things?
Loud Noise
Heavy Smoke
Fumes
Where should you be sure to ground the clamp?
Position it where the welding current will not pass through seals, bearings or other contacting surfaces that could be damaged from arching.
Groove depth and contour are controlled by what 3 things?
Electrode Travel Angle
Tip Side Movement
Travel Speed
For a shallow gouge, the electrode is what?
Advanced at a rapid rate.
Notches left in a base metal have a tendency to what?
Trap slag during welding
Dross or carbon deposits left on a surface to be welded will what
Combine with the base metal.
Dross or carbon deposits left on a surface to be welded will combine with the base metal will form what?
Hard, brittle zones and porosity in the weld zone.
Process of cutting a groove into a surface usually to prepare it for welding.
Gouging
With CAC-A gouging, the electrode size determines the what?
Minimum groove width.
Groove depth and bottom contour are determined by the what?
Electrode travel angle and speed.
