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Slag - When dross is present on carbon steel, it is commonly referred to as either "high speed, slow speed, or
top dross".
Dross present on top of the plate is normally caused by too great a torch to plate distance.
"Top dross" is normally very easy to remove and can often be wiped off with a welding glove. "Slow speed
dross" is normally present on the bottom edge of the plate.
It can vary from a light to heavy bead, but does not adhere tightly to the cut edge, and can be easily scraped off.
"High speed dross" usually forms a narrow bead along the bottom of the cut edge and is very difficult to remove.
When cutting a troublesome steel, it is sometimes useful to reduce the cutting speed to produce "slow speed
dross".
Any resultant cleanup can be accomplished by scraping, not grinding. Depending on the material cut, the
operator may want to grind the surface of the cut before welding.
Common Faults
TABLE 5.2
PROBLEM - SYMPTOM
??
Short Torch Parts Life
0-5584
3.
1.
4.
2.
3. Cutting current too
high.
1.
4. Work cable
disconnected.
2.
3.
1.
.
2.
3. Excessive pilot arc
1.
time
2.
1.
2.
COMMON CAUSE
5. Cutting current
too low
5.
4. Improper cutting
current.
4.
6.
5.
5. Improperly
assembled
torch.
29
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