Tweco 220 VAC 50Hz Drag-Gun - Manual (Page 20)

DRAG-GUN Plasma Cutter (Australia) 16 Operating Manual 0-2737
Figure 5-6 Cut Sample
NOTE
A worn tip can also affect the quality of a cut.
Consider replacing the tip if any of the following
indicators are present:
• reduced speed
• voltage drop
• crooked cut
5.3 Recommended Cutting 5.3 Recommended Cutting 5.3 Recommended Cutting 5.3 Recommended Cutting 5.3 Recommended Cutting
Speeds Speeds Speeds Speeds Speeds
Cutting speed depends on material type, material thick-
ness, and the operator’s ability to accurately follow the
desired cut line. The following factors may have an im-
pact on system performance:
• Torch parts wear
• Line voltage fluctuations
• Torch standoff height
NOTE
This information represents realistic expectations
using recommended practices and well-maintained
systems. Actual speeds may vary up to 50% from
those shown.
Material Gauge Inches per
Minute
Stainless Steel 20 60
Galvanized Steel 18 60
Aluminum 16 20
Carbon Steel 10 9
Figure 5-7 Cutting Speed Chart
5.4 Common Cutting Faults 5.4 Common Cutting Faults 5.4 Common Cutting Faults 5.4 Common Cutting Faults 5.4 Common Cutting Faults
A. Insuf . Insuf . Insuf . Insuf . Insufficient Penetration ficient Penetration ficient Penetration ficient Penetration ficient Penetration
a. Cutting speed too fast
b. Torch tilted too much
c. Metal too thick
d. Worn torch parts
B. Main Ar B. Main Ar B. Main Ar B. Main Ar B. Main Arc Extinguishes c Extinguishes c Extinguishes c Extinguishes c Extinguishes
a. Cutting speed too slow
b. Torch standoff too high from workpiece
c. Work cable disconnected
d. Worn torch parts
C. Excessive Dr C. Excessive Dr C. Excessive Dr C. Excessive Dr C. Excessive Dross For oss For oss For oss For oss Formation mation mation mation mation
a. Cutting speed too slow
b. Torch standoff too high from workpiece
c. Worn torch parts
D. Short T D. Short T D. Short T D. Short T D. Short Tor or or or orch Parts Life ch Parts Life ch Parts Life ch Parts Life ch Parts Life
a. Exceeding system capability (material too thick)
b. Excessive pilot arc time
c. Improperly assembled torch
d. Inadequate air supply (check filter on compressor)
e. Faulty air compressor
5.5 Common Operating 5.5 Common Operating 5.5 Common Operating 5.5 Common Operating 5.5 Common Operating
Pr Pr Pr Pr Problems oblems oblems oblems oblems
Getting used to the way the system sounds and feels while
it is operating properly will help to determine the nature
of problems if they should arise.
A. Compr A. Compr A. Compr A. Compr A. Compressor Related essor Related essor Related essor Related essor Related
If the unit is cold, the air compressor may not start up or
may run sluggishly. Most likely, when the torch switch is
depressed, the unit will click once and nothing more will
happen. Let the unit warm up to room temperature, ap-
proximately over 50° F (10° C) and try again.
If the air filter on the compressor becomes clogged, the
compressor may sound more labored, cut speed and qual-
ity will be reduced, and the arc may have a more green
color. The air filter element can be cleaned - remove it,
blow air through it, and reinstall it.