TopTech FAQ plasma cutting quality & main reason

TopTech FAQ

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.