×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

mechanical

mechanical

mechanical

(OP)
I am Laser welding and I have a problem with spatter on the first shot of the weld. How can I eliminate this without changing macnines?

RE: mechanical

I don't know anything about your particulars, but only on "first shot"?

That makes me suspicious that your cover gas hasn't purged out before you make the first shot.
Tell us more?

Jay

Jay Maechtlen
http://home.covad.net/~jmaechtlen/

RE: mechanical

(OP)
It is my understanding the first shot is hitting cold material and exploding due to the different energy absorption of hot and cold material. The gas is on and flowing about 3 seconds before the weld. This is a keyhole type weld.

RE: mechanical

Can you ramp the power level up for starting the weld?

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"It's the questions that drive us"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

RE: mechanical

(OP)
I can simulate the ramp, but it addds to the cycle time. This is an older machine without ramping. I am trying to reduce the cycle time as well.

RE: mechanical

If you are not using any filler material that first spot with some slight spatter should be your keyhole. This is the first point of beam absorbtion and what drives your weld pool. Can you give us some other details on the application (laser,type of weld joint,parent material)?   

RE: mechanical

Hi,
My laser weld spatter problems I have encountered were caused by dirty parts. Residue of chemicals from the washers actually.This would cause porosity in various locations among the weld joint (occasional blowouts ) scrapping the part. Our application always had the part in motion before opening the shutter and starting the weld. Stationary, which I did manually a few times, yielded a big spot and spatter in most cases. That was for test purposes though.

Let us know your details like Chadxyz requested. My experience was in a transmission plant.

I hope this helps some.

Scott

In a hundred years, it isn't going to matter anyway.

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


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

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