Body Restoration Question

I guess I'm an oddball. I like to do metal repairs 1st, then strip the rest. Of course I clean everything before welding, etc. Stripping after then preps the new mtal with the old, cleans out welds, makes it all "the same". Just sayin...
 
BRENT in 10-uh-C said:
Richard, are you of the opinion that the steel "work hardens" due to the blasting?
Click to expand...

Brent, I would defer to your expertise on this matter.

"Work hardening", as referenced to sand blasting by me, would be a condition I have read about, that would be related to excess heat created in a panel from using to much air pressure and agressive grit. As I wrote, I have never knowingly experienced this in any of my personal repairs.

For sheet metal, I use 45 - 50 pounds air pressure at the blaster inlet. TIP 99er sand blast unit, 1/8 in or smaller nozzle, fine grit silica, sand valve 1/2 open. When blasting, I keep the nozzel at least 12 inches from the metal, slightly angled and keep it moving. I do reuse sand after screening. Reuse does cause a great deal more dust than just using it one time.
 
Generally speaking in the world of sheetmetal shaping, it is now believed that low-carbon steel really does not "work harden" per se' to any appreciable standards where you would ever notice it. Granted, Mild Steel can be hardened (somewhat) if carborized, but generally speaking in the world of mediablasting, if the metal has been that hot due to the media friction, then the warpage is going to be the bigger issue.
 
Thanks Brent for helping clear up confusion caused with my post. By definition I misused the term "work hardening". I should have only used the panel warping verbage.
 
Work harden and metal fatigue can be confused. Sandblasting brass makes it crack fairly quickly, soft sheet metal would get metal fatigue eventually i guess. Kind of like beating an anvil until it cracks inside and makes a thud instead of a ringing noise. (Read that anvil part on the internet)
 
Thanks for all of the responses! I think I am going to go with the media blast. Quite a bit cheaper than getting it stripped. I got a quote for $500 from a guy who has done model a bodies before. I am going to ask him what media he uses before I finalize the deal. What media should he be using?
 
You must log in or register to reply here.
Back
Top