12
Operating Techniques
Piercing
Materials (up to 3.2mm/1/8in. thick) may be
pierced with the torch touching the work. When
piercing thicker materials (up to 4.8mm stainless
or carbon steel) at an angle, position the torch
0.5mm (.02”) above the workpiece. It is advisable
when piercing thicker materials to drill a small
pilot/starting hole in the workpiece which makes
it a lot easier and gives increased tip life.
Start the cutting arc, then immediately raise the
torch to 1.6mm (1/16”) stand-off and move the
torch along the cut path. This will reduce the
chance of spatter from entering the torch and pre-
vent the possibility of welding the tip to the plate.
The torch should be angled at about 30° when
starting to pierce, and then straightened after ac-
complishing the pierce.
1. To start a pierce tilt the torch to prevent
molten material from coming back against
and damaging the torch.
2. When the arc breaks
through the work, bring
the torch to an upright
position and proceed to cut.
Piercing Technique using the SC40C
Material
Thickness (mm)
Cutting Speed (mm/m)
1.6
8,382
Carbon Steel (AISI 1020)
3.2
2,667
6.4
1,346
1.6
8,128
Stainless Steel (AISI 304)
3.2
2,286
6.4
1,016
1.6
011,430
Aluminium (6061)
3.2
5,080
6.4
1,778
NOTE!
The speeds given here are typical for best quality cuts. Your actual speeds may vary depending on
material composition, surface condition, operator technique, etc. If cutting speed is too fast, you may lose the
cut. With slower speeds excessive dross may accumulate. If speed is too slow, the arc may extinguish. Air cutting
typically produces a rough face on stainless steel and aluminium.
Summary of Contents for SC40C
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