plasma cutting quality & main reason
I. The cutting surface is not vertical:
When we use the common plasma power source to cut, the best one will have a small angle of inclination about 3-5°. If the actual angle is bigger than 3-5°, that belongs to the vertical is not good, and the reason is as following:
A. Torch installation is not vertical to the plates: if cut a symmetric figure the angle is the same side, that is this problem.
B. Cutting direction is incorrect: the required side should be on the torch forward right side.
C. Torch height is not good: Negative cut angle (the bottom side is less) means the torch height is too low; Positive cut angle (the top side is less)
D. Torch spare parts need to change;
E. Cutting current is not good;
F. Cutting speed is not good.
II. The drows on the cutting part:
A. The spater on the top side: the spater on the both sides of the kerf
Reason: torch is too low
Solution: adjust higher arc voltage value to heighten the torch.
B. The drows on the bottom side:
--Cutting speed is too slow, and the shape of the drows are bolls and a lot.drows can be easy to move out.
Reason
|
Solution
|
Cutting current too large
|
Reduce cutting current and use the matched spare parts for the torch
|
Cutting speed too slow
|
Faster the cutting speed
|
Cutting height too low
|
Adjust higher arc voltage value to heighten the torch
|
--Cutting speed too fast:,the drows are fine rolls, and hard to move out.
Reason
|
Solution
|
Torch nozzle broken
|
Change nozzle
|
Cutting current too small
|
Increase cutting current and use the matched spare parts for the torch
|
Cutting speed too fast
|
Slower the cutting speed
|
Cutting height too high
|
Adjust lower arc voltage value to heighten the torch
|
Otherwise, the bottom drows also considered about air pressure and flow setting.
III. Didn't cut through:
A. The first piercing spot didn't cut through and lead the shape didn't cut through: the pierce delay time is too short, should be longer;
B. The first piercing spot had cutted through, but the following parts didn't cut through:
Reason
|
Solution
|
Torch nozzle broken
|
Change nozzle
|
Rusting, paint or other insulators on the cover of cutting materials
|
Move out the insulators
|
Cutting current too small
|
Increase cutting current and use the matched spare parts for the torch
|
Cutting speed too fast
|
Slower the cutting speed
|
Plates too thick for plasma power source
|
Change into suitable plasma power source
|
IV. The min hole cutting rules:
• Rules: The hole's inner diameter should be twice as the plate thickness;
• To cut small hole the inside will be a taper hole.
