×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

Surface preparation method

Surface preparation method

Surface preparation method

(OP)
Hi guys,
Are sand blasting & shot blasting processes same?
These are related to surface preparation before painting.
If they are not same, which one is better and why?

Thanks

RE: Surface preparation method

Assuming substrate material = steel...
Sand blasting in many cases is used to remove previous coatings, rust, scale, etc., down to bare steel. Also changes surface texture.
Shot blasting will do this also, but has added property of cold-working the surface of the steel & makes the surface harder.

TygerDawg
Blue Technik LLC
Virtuoso Robotics Engineering
www.bluetechnik.com

RE: Surface preparation method

I would say that the terms "sand blasting", "grit blasting" or "shot blasting" all imply a similar process. That being a process intended to remove something (paint, corrosion, etc) from the surface of a component, usually a metal component. The term "shot peening" would imply a much more energetic and controlled process where metal/ceramic shot is directed at high velocity onto a metal surface to put the surface layer into compression.

I think the best terms to use for describing a process to clean a surface are either "media blast" or "grit blast", since there are numerous types of abrasive media used such as sand, glass beads, baking soda, walnut shells, ceramic particles, metal slag, or even frozen CO2 powder.

RE: Surface preparation method

(OP)
Does shot blasting process significantly harden the surface?
It's a new information for me.

RE: Surface preparation method

shot blasting, or shot peening, is intended to create a compressive stress in the surface layer, to improve fatigue or corrosion resistance.

sand blasting, IMHO, wouldn't create this, and is more a surface preparation for painting.

Quando Omni Flunkus Moritati

RE: Surface preparation method

rb1957,

steel shot blasting is a process commonly used to clean metal parts with no intention of altering the mechanical properties in the surface of the component. A good example is the cleaning of sand castings using Wheelabrator machines. The shot blast removes flash and contaminants like mold sand from the casting surface, and produces a uniform surface texture, but it is not intended to alter the mechanical properties of the casting.

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!


Resources