Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Cutting Quality Goes Bad After Some Time

Cutting Quality Goes Bad After Some Time

Cutting Quality Goes Bad After Some Time


We are cutting 2.7mm mild steel using a 1.5kw fiber laser cutting machine. We have nested the part on a sheet and cutting is going on continuously. After about an hour of cutting, the edge quality starts degrading progressively. We have not changed any parameters. The O2 gas is also from the same source and there is sufficient quantity of gas at the required pressure. What could the possible causes be?


RE: Cutting Quality Goes Bad After Some Time

Have you checked the nozzle so it isnt clogged or deformed?

RE: Cutting Quality Goes Bad After Some Time

If quality changes, then either the beam quality is changing, the delivery (lens/nozzle performance/nozzle standoff) is changing, or the gas (pressure or quality) is changing.
I haven't worked with a fiber laser - I presume there's a focus lens and perhaps some optics between the fiber and the lens? Any of those could heat up due to cooling issues - when optics heat up they often change characteristics, perhaps changing the effective location of the beam spot.

Jay Maechtlen

RE: Cutting Quality Goes Bad After Some Time

I have checked the nozzle and it isn't clogged. I have now reduced the chiller temperature setting and will see if that improves the cut quality. Thanks!

RE: Cutting Quality Goes Bad After Some Time

does it recover and start cutting good again?

Chris Krug http://krugtech.com/
Maximum Up-time, Minimum BS

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close